Radio Shack TRS-80 PC-3 Specifications

We Take the Mystery Out of Computers..

.

What is a computer?

Not so many years ago, the pocket calculator w e now take for granted could have passed for a powerful computer, worth a great deal of money. Today, how- ever, there is much more to the definition of a computer.

Computers work not only with numbers, but with alphanumeric data-names, words, stock numbers. A computer can be programmed to repeat the same function over and over. It can log- ically evaluate information given to it, and act on its findings. It can store large volumes of data for future use or reference. It can converse with its operator.

Obviously, a computer is much more than just a "number- cruncher." It is literally an extension of the mind. It is to man's mind what the lever is to h s arm

-a machine capable of increas- ing his effectiveness. It can free you from repetitive exercises which do not require human judgement. It can provide facts and figures with extreme speed, giving you the time to exercise your judgement thoughtfully.

What Can a Computer Do?

Large computers are well known in the business world for their ability to do bookkeeping, bdling, payroll, inventory control, and fast analysis of data.

Because computers work with alphanumeric information, they can sort a mailing list by name, address or other criteria, spot slow-moving inventory items, write purchase orders based on sales trends

. . . or simply catalog your butterfly collection. Com- puters can become teachers, lab assistants

even entertainers that play all l n d s of fascinating games, from chess to space war.

TRS-80:

The Million-

Dollar Breakthrough

TRS-80 systems are capable of performing all of these opera- tions, and quite a few more not mentioned. Although TRS-80 is a small computer, it offers computing power that would have cost more than a million dollars just a few years ago. And now there are two TRS-80 systems! -the

Model I and the all-new Model 11

"strictly business" computer.

The chart on page 5 will give you a feeling for the relative capabilities of the two systems.

Your nearby Radio Shack store, authorized dealer or Computer

Center can help you select the

TRS-80 system and accessories you need for your particular application.

B

1;

I

@ 1979 Tandy Corporat~on,

Retatl prices

m

this catalog may vary at

76109.

indlmduaf stores

and

clealers.

The

Company cannot be l~able

or

plctonal errors

What the Expanding World o f

TRS-80 is

About.

. .

It's About Business and the New Model

I1

2-Megabyte System.

. .

Although thousands of TRS-80

Model I systems are used com- mercially some applications require more memory and hgher speed than Model I offers.

Rather than stretch the expansion limits of Model I to meet these additional requirements,

Radio Shack designed and built an entirely new computer

.

.

.

TRS-80 Model 11.

Model I1 offers twice the speed of

Model I with memory storage up to 2 mdlion bytes. Model

11 compares favorably with systems like

IBM's 51 10

-and

66

%

less! costs

33

%

to

It's About Service

Before and After

You Buy.

. .

You can order a TRS-80 at over

7000 locations worldwide. And our 50 new Computer Centers are ready to assist you with after-the-sale training, service and expert advice!

It's Over 100,000 Systems

Sold and TRS-80's

Growing Acceptance as the "Standard"

Small Computer

When we introduced TRS-80

Model I in 1977, we did not anticipate the incredible demand for small computers.

Today, our factories operate around the clock to meet this demand, which is still growing.

Radio Shack revolutionized the industry by budding affordable computers (instead of just talking about them). And we're in the business to stay!

:4

a

-4

.

I

Model I1 Systems and Accessories. See Pages 18-23

r-

i

$

3

It's the Benefits of Modular Design.

. .

You can buy the Model I or I1system that's required for today's jobs -and expand later to meet growing (or changing) needs.

Our promise: We'll sell you what you need, not more, not less, and you

save money

!

It's About Value

Blladel I Systems and Accessories. See Pages 6-17

. . .

TRS-80 Model

I systems start at

$499. Last year's price was $599.

The reason for the cut is the effi- ciency of mass production, and we're passing along the savings!

TRS-80's traditional economy continues with Model 11, which provides more power-per-dollar than any other small computer!

It's About

Continuing Support.

.

.

In addition to the sensational

Model 11, we've introduced new hardware items and many new software packages for Model I.

Radio Shack wants to be your small computer company and you can be sure of our support

.

. . today and tomorrow!

Over

100,000

Owners Know

TRS-80's

Benefits

important side effect

the logi- of the most important to our family and to the education of our cal approach to problem solving.

Small Businesses

Save Time and

More TRS-80 systems are used in the classroom than any other child that we have ever seen." type of computer! And Radio

What's Behind the

Cut Costs

Success of TRS-80?

Shack supports TRS-80 with

Small-business owners have Availability TRS-80 Model I is in teacher guides, course materials learned TRS-80 gives them an stock in most Radio Shack stores. and service. effective, yet affordable "head

You can see and try one before start" on the competition. Tedi- ous paperwork like payroll and inventory

can

be handled by

TRS-80, and this allows a busi- nessman to spend more time on the really productive areas of his job.

Larger businesses that own (or have access to) a full-blown mainframe computer have found

TRS-80 is ideal for jobs too small to be cost effective on the big computer. TRS-80 saves time because it handles small jobs without interrupting the big computer's schedule, and there's usually no waiting to use the

TFB-80 system.

The Most Popular

Personal Computer in the World

At home, thousands use TRS-80 systems to manage budgets, catalog valuables, educate and entertain with fascinating games. Most owners (now well over 100,000) regard their TRS-80 as an investment. A father tells us his TRS-80 investment "is one you buy Model I1is displayed in

Radio Shack Computer Centers, but you can order from any Radio

Shack outlet.

It's easy to use. Level I's superb manual makes learning to program fast, simple and fun. And

Radio Shack's prerecorded software permits an operator with little or no experience to use

Model I or Model

11 for a variety of jobs.

It's expandable. Even the smallest

Model I system

can

be expanded to our largest Model I business system. Model

11 expands, just as easily to meet growing or changing needs.

TRS-80 Goes to School

Schools everywhere now rely on

TRS-80 as an aid in teaching math, language arts, even computer

programminq

and its very

After

the sale. Radio Shack provides the answers you need before -and after- you buy Our

Computer Centers offer classes in programming and each has a service facility. And we're constantly adding software and accessories to increase the versatility of both Model I and

Model II.

I

TRS-80

System

Selection Guide

Figures refer to Ra&o Shack software Other software may give M e r e n t quantities.

*

Expected quantities for software to be offered in the near future

TRS-80 Model I and

Model I1 Specifications

The

TRS-80

Model

I

Microcomputer System

Radio Shack's TRS-80 Microcomputer System is fully

wired,

tested and

U.L.

listed for electrical safety -you can put it to work immediately! It's ideal for finances, education, accounting, lab use -even for home entertainment. And it's the computer with a full line of accessories being delivered now with more to come in the future!

Basic TRS-80 systems include a

22"

video monitoc Realistic battery/AC cas-

Blackjack and Backgammon.

The TRS-80 comes to you ready to be programmed either from prerecorded cassette tape or from the keyboard.

A

"program"issimply a set of step-by- step instructions telling your TRS-80 what you want it to do. The TRS-80's programs are written in easy-to-learn, plain-English BASIC programming language (BASIC stands for "Beginner's All-purpose Symbolic Instruction

Code"

.

The Level I user's manual includes a beginner's course in BASIC that '11 have you "talking" to your computer in no time.

16K

Model

Pictured

New

Lower

Prices!

TRS-80 Model I

Systems Now Low

As

Level I 4K

Inside the keyboard is the computer's "brain."

A

powerful 2-80 microprocessor serves as the central processing unit (CPU). Programs and data are stored in internal "memory chips." Our lowest-priced TRS-80 computer contains 4096 bytes

(4K) of user memory, or RAM (a

:

,

, byte being roughly equivalent to one typewritten character and made up of eight electrical signals called "bits"). It can be expanded to 16K within the keyboard unit and to 48K by using the Expansion Interface with additional memory options.

And now, every new 16K TRS-80 includes a calculator-style numeric keypad (available as an option on 4K computers). i

I

Note: the 2-80 is an 8-bit microprocessor and can address a total of 64K of memory. Both ROM and

RAM are addressed in the TRS-

80, along with some internal

"overhead." In a 48K RAM configuration, the last memory

5 -the usual ending address for a 64K computer.

The "Read-only Memory" chips contain the "BASIC interpreter" software. The interpreter ac-

for Business, Education or

Personal Use

cepts plain-English commands and statements from the programmer and translates them into the numeric language of the 2-00.

You can access the Z-80's numeric "machine language" directly by using our "T-Bug" monitor program, available on cassette tape, or in "assembly language" by using our

"EditodAssembler" tape. (Both of these tapes are suggested only for advanced programmers with a knowledge of machine and assembly language.)

The Realistic cassette recorder lets you record and play your own programs or use one of

Radio Shack's prepared programs

simply run the cassette and begin computing. Other recorders may be used-with varying degrees of success-but only if they have automatic recording level capability.

The video monitor looks like a standard television set without the channel selector. It features a wider bandwidth than most TV sets for a sharper display of printing and graphics. The monitor operates on ordinary 120-volt

AC, 60 Hz house current. Foreign versions are available in other countries and are sold only over- seas by Tandy Electronics outlets. The computer cannot be connected directly to a standard

TV set.

For access to other hardware, the TRS-80 utilizes a unique

40-pin bus (connector system) that can attach the TRS-80 to our

Expansion Interface, or other external devices. rial, the TRS-80 is virtually un- breakable. It may be left "on" for extended periods of time with no adverse effects, as long as the cooling vents are not obstructed.

Inside Your TRS-80

System Prices

Level I 4K. 26-1051

.

.

. . .

.499.00

Level I 16K. 26-1053

.

. . . .

729.00

Level I1 4K. 26-1054

. .

.

Level I1 16K. 26-1056

.

. .

619.00

. .

849.00

Specifications

Microprocessor: Advanced 2-80

8-bit processor. Clock speed,

1.78 MHz.

Keyboard: Integrated, full-size,

53-Key professional-type.

Video Display: Memory mapped, all graphics and alphanumerics controlled by BASIC commands. Cursor control. Automatic scrolling.

Text: 16 lines of up to 64 characters with Level I. With Level 11, you may select a n optional mode of 32 characters per line.

Graphics: 128 horizontal by 48 vertical. Graphics and text can be combined in any manner by software.

Memory: Includes 4K or 16K Read-

Only Memory (ROM), 4K or 16K Ran- dom Access Memory

(RAM).

Input/Output: Computer-controlled cassette interface. Expansion port built-in.

Power: Power Supply; 120VAC,

60 Hz, 50 watts. Video Monitor;

120VAC 60 Hz, 50 watts. Both U.L. listed for electrical safety.

Supply, 2

5/8~2Y3

l/4

1'

ABS' is a

trademark of Borg Warner

Choose from Two Versions of

BASIC

Language

1

Level I BASIC

Level I is a simplified version of

BASIC programing language. Our outstanding owner's manual lets you learn how

to

program quickly prior knowledge of computers or

I

andeady-evenifyouhaveno programming. Level I includes video

arapbics,250-baud cassette in- iut/output, floating point arithme- variables and co-and abbreviations.

More Powerful

Level I1

Level 11is an advanced version of

BASIC. It offers vastly increased computing power and additional features as indicated below. Note that Level 11intrinsic functions re- main at 6-digit accuracy. .A detailed

140-page

manual

is included.

Level TI

includes

23 specific error codes which can also be used to generate an error in order to test err& trapping routines.

Feature Comparison

Chart

FEATURE LEVEL I LEVEL 11

Array Dimensions O n e No limit

Array names

A(X)

Anyr

numeric variable name

A u t o line number N o Yes

Cassette Speed 250Baud 50OBaud

Compressed Prag.

Storage

Command

Abhreyiations

Disk

Capability

Error Codes

Error Trapping

Editing

Execution time

No Yes

Yes

No

3

No

No

Yes

2 3

Yes

NQ Yes

(L-II 39%faster t h a n L-I)

Formatted

Print

Keyboard rollover

Logmal line lgth.

Multi Statement prog. h e s

No

No

Yes

Yes

6 4 Char. 255 Char.

Yes Yes

N a m e d files No Yes

Numeric accuracy:

Single precision

Double precision

6 Digits 6 Digits

-

16

Digits

Numeric Variable

Names

A-Z A-Z,AA-ZZ

Al-Z9

Port Access h i n t e r Commands

B o g . line lgth.

No

NO

Yes

Yes

64 Char. 255 Char.

ROM size

Screen Format

String length

String names

4K

22K

16 x 64

28

x

64 or

1 6 x 3 2

16 Char.

255 Char,

M , B $ Any numeric variable n a m e

Tracing

8

Variables names

No Yes

1 Char. Multi-char.,

(2 Sigmficant)

Language Comparison

Chart

COMMAND

ABS (XI

ASC

(A$)

ATN(X)

AUTO

CDBL (XI

CHR$(X)

CINT(X)

CLEAR

CLEAR(X)

CLOAD

CLOAD?

CLOAD (FILE)

CLS

CONT

COS(X)

CSAVE

CSAVE (FILE)

CSNG(X)

DATA

DEFDBL

DEFINT

DEFSNG

DEFSTR

DELETE

DIM

EDIT

ELSE

END

ERL

ERR

ERROR(X)

EXP(X)

FWXJ

FOR-NEXT-STEP

FRE(A$)

FRE(0)

GOSUB

G O T 0

IF-THEN

INKEY$

INP (XI

INPUT

mu?'#

INPUT#-X

I N T W

LEVEL I LEVEL

I1

(Cont'd)

LEFT$(A$)

LEN(A$)

LET

LIST

LLIST

LOG(A)

LPOS(0)

LPRINT

MEM

MID$(A$,X,Y)

NEW

NOT

ON

ONERROR GOT0

OUT X,Y

PEEK (X)

POINT (X,Y)

POKE X,Y

POS(X)

PRINT

PRINT AT

PRINT@

PRINTUSING

PRINT#

RANDOM

READ

REM

RESET(X,Y)

RESTORE

RESUME

RETURN

RIGHT$(A$,X)

RND(1)

RND(X)

RUN

X

X

X

TRS-80

Model

I

Accessories

You W l Want!

S y s t e m Dust Covers

Keep your system in top condition when it's not in use. Custom vinyl covers fit snugly over systems, disk drives or line printers.

System Cover. 26-501

. . . . . . . . .

.7.95

2-Pack Disk Drive Covers.

26-502

. . . . . . . . . . . . . . . . . . . . . . .

5.95

Printer Cover (for 26-1150 or 26-1152).

26-503

--

5.95

Dual-Section TRS-80

Power Line Filter

Limits AC power line interference to your TRS-80 Model I system. The same outstanding filter w e built into

Model 11,including built-in dual, iso- lated filters -one for the computer system and one for the accessory items. Contains 8 outlets all controlled by a single switch.

U.L.

listed.

26-1451

. . . . . . . . . . . . . . . . . . . .

.39.00

VidedProgram

Worksheets

Each package contains two pads of

50 two-sided sheets. One side is a proportional Model I screen layout chart for designing graphics or print locations. The other side is a programming worksheet with space for program lines and variable names or comments.

26-2105

. . . . . . . . . . . . . . . . . . . . . .

2.95

NEW

MODEL

TRS-80 S y s t e m

Carrying Case Set

Take your TRS-80 system with you wherever you go! One case holds the video monitor, the other holds the keyboard unit, power supply, cassette recorder, cables and cassettes. Black molded vinyl. Hand carry only-not designed for ship- ping purposes.

26-500

. . . . . . . . . . . . . . . . . . . . . .

69.00

TRS-80 Manuals

Level I User's Manual

Our Level I manual is intended for the novice. It's a teaching manual whose humorous, easy-to-read style makes learning fun. 232 pages explaining the capabilities of the computer. Included with

TRS-80 systems or available separately

62-2016

. . . . . . . . . . . . . . . . . . .

5.95

Level I1 Reference Manual

This manual is included with

Level

II

equipment and Level 11 conversions or is available separately 140 pages of invaluable ref- erences. Assumes the reader is familiar with Level I programming.

26-2102

. . . . . . . . . . . . . . . . . . .

5.95

DOWDisk

BASIC

Manual

A complete reference manual for the TRS-80 Disk Operating Sys- tem and Disk BASIC. Included with our Mini-Disk system or available separately

26-2104

. . . . . . . . . . . . . . . . . . .

5.95

TRS-80 Technical Manual

We have gathered the schemat- ics, logic and timing diagrams for

Level I and Level 11plus easy-to- read sections on circuit theory and circuit description.

26-2103

. . . . . . . . . . . . . . . . . . .

9.95

Level I1 BASIC

(ROM) Kit

When you've mastered Level I programming language, you can move up to higher computing power with

Level II. Conversion is easy -we simply exchange the ROM chips in your TRS-80 for chips containing

Level II. Your local Radio Shack store can arrange for the exchange. Incor- porate Level 11into your 4K or 16K

RAM Level I TRS-80.

26-1120

. . . . . . . . . . . .

. .

120.00

Calculator-Style

Entries with the

Numeric Keypad

790°

Makes entering data a lot faster when you're used to using a standard calculator. Enter by either the keypad or typewriter keyboard numerals.

26-1103

. . . . . . . . . . . . . . . . . . . . .

79.00

16K Memory

(RAM)/Keypad

Kit Increases TRS-80's

Internal Memory

The TRS-80 is designed for easy upgrading to a full 16K of RAM memory inside the keyboard unit.

Your nearest Radio Shack store can arrange for the exchange of your 4K for 16K chips and add the keypad.

26-1101

. . . . . . . . . . . . . . . . . . .

.230.00

TRS-80

Certified

Cassettes

C-20 digital computer cassettes are ideal for storing all of your important programs. These tapes are leaderless and individually tested to insure against loss of any data.

26-301 . . . . . . . . . . . . . . . . . . . . . .

.3.49

Quantity Savings on

Cassettes

Quantity Price Each

1-11

12-23

24-47

48-up

3.49

3.09

2.69

2.29

The

Keys to a

More Powerful

TRS-80

TRS-80 Expansion

Interface

Expansion is a key word in the

TRS-80 philosophy The TRS-80's modular design lets you expand to just the system you want. Of course, you can add 16K RAM and Level I1

BASIC to the keyboard unit. Beyond that point, the Expansion Interface becomes the hub of expanded

TRS-80 computer systems.

The Expansion Interface measures

4

Y2

xl6

Y2

x8" and is designed to sit directly under the video monitor act- ing as a base for it. The TRS-80's power supply module, and an identical one for the interface, are housed inside the interface enclo- sure. Space is also provided for our optional RS-232-C Serial Inter- face Board.

A

cable approximately 6" long connects the interface to the TRS-80 bus connector. The interface provides output connectors for our

TRS-80 printers, disk drives, dual cassette recorders, and an RS-232-C serial port, as well as an extension of the TRS-80 bus.

The controllers for (electronic cir- cuits needed to control) up to four

TRS-80 Mini Disk drives, a printer and dual cassette recorders are an integral part of the Expansion Inter- face, as are the provisions for an extra 16K or 32K of optional RAM.

The printer output port is a standard

Centronics parallel circuit. This parallel port and our RS-232-C serial port allow connection of a variety of peripheral devices. Pin-out information is provided in the owner's manual. Each requires 120VAC, 6OHz, 50 watts. U.L. listed.

Voice Synthesizer

Now you can program your TRS-80 to speak. It's not a pre-recorded human voice, but electronically

"synthesized" speech projected through a built-in speaker. It plugs into your TRS-80's bus connector on keyboard or Expansion Interface.

Programming spoken words is done by typing combinations of some 60

"phonemes" representing spoken sounds. Requires Level I or 11-16K

RAM preferred.

26-1180

. . . . . . . . . . . . . . . . . . . .

399.00

Expansion Interface with 0 RAM.

26-1140

. . . . . . . . . . . . . . . . . . .

.299.00

Expansion Interface with 16K RAM.

26-1141

. . . . . . . . . . . . . . . . . . .

.448.00

Expansion Interface with 32K RAM.

26-1142

. . . . . . . . . . . . . . . . . . . .

597.00

16K RAM Memory Expansion Kit.

26-1102

. . . . . . . . . . . . . . . . . . . .

149.00

Cassette Recorder.

26-1205

. . . . . . . . . . .

. . .

49.95

Experiment with "voice recognition" on your TRS-80. That's right, speak into a microphone attached to the

VOXBOX and you can program your

TRS-80 to respond to your spoken words.

Computer voice recognition is a new field, and not fully developed, but here's your chance to experiment with this exciting new technology.

Level 11required.

26-1181

. . . . . . . . . . . . . . . . . . . .

169.95

1

I

VOXBOX

Voice

Synthesizer

Desks and Communications for Your TRS-80

TRS-80 Telephone

Interface I1

This is the fast way to transfer data from one location to another-by telephone with the Telephone Inter- face 11. It's a full "originate/answer" acoustic coupler which allows two

TRS-80's to talk to each other. You can also communicate with another computer which has "originate only" capability (like our Telephone Inter- face I.) You can pass all types of data or programs between computers, or one of you can operate the other's computer via the telephone lines.

No direct connection to the telephone line is require'

TRS-80 System Desk

Attractive and functional. Keyboard and Expansion Interface fit into de- wiring concealed. A bay under the desk can house from one to four Mini Disk drive units. Add a Quick Printer and there's plenty of workspace left.

27x48~27".

26-1301

. . . . . . . . . . . . . . . . . . . .

199.00

Auxiliary fan kit for the bay

Space-Saver Stand

only 373/4x233/4", but holdS a

TRS-80, cassette recorder, CRT, EXpansion Interface, Quick Printer and single or dual disk drives. Space-

Saver was designed to hold your system and stillleave ample room for work. The low-cost answer for home or educational users.

26-1304

. . . . . . . . . . . . . . . . . . . . .

49.95

RS-2324 Serial

Interface Board

990°

You can let your TRS-80 communicate with the "outside world" by using our TRS-80 RS-232-C Serial

Interface Board. It lets you connect the TRS-80 to a variety of accessories such as modems, card readers, line printers and acoustic couplers.

The RS-232-C board mounts inside our Expansion Interface. A cable is provided for connection to external equipment such as Radio Shack's

Telephone Interface or perhaps your own serial line printer. Included is a comprehensive user's manual and a cassette tape program which allows the TRS-80 to act as a n interactive terminal for communication with a remote time-sharing computer system.

26-1145

. . . . . . . . . . . . . . . . . . . . .

99.00

TRS-80 RS-232-C Specifications

Baud Rate: Switch selectable in 8 steps from

110 to 9600 baud. Software controllable m 16 steps from 50 to 19,200 baud.Stop Bits:

Selectable 1 or 2. Wordlength: Selectable

5 to

8 bits. Data In/Data Out Ports: Switch revers-

Ible. Logic State Sensing: Clear to send, Data

Set Ready, Carrier Detect,

Ring

Indicator.

Software Controllable Outputs: Data Terminal

Ready, Request to Send. Software Control:

All

functions except Data Inmata Out reversmg are fully software controllable.

Terminal Program

Comes with

RS-232-C Board

It's very simple to operate.

J U ~ L L

the phone number at the location of

~

the TRS-80 you desire to communicate with; after the connection is made, each telephone handset is placed on its interface. Now you're ready to receive and transmit data.

Requires RS-232 Serial Interface

Card, Expansion Interface, RS-232

Communications Package and Level

11.Adds versatility to your TRS-80.

26-1171

. . . . . . . . . . . . . . . . . . .

.199.00

Specifications

Baud Rate: up to 300. Mode: Originate and receive, half or full duplex. Receive Sensitiv-

ity:

-45 dBm. Power Requirement: 24 Volts

4C,

150mA, supplied by

U.L.

listed

AC

~ d a p t e r .

Communications

Software package used with Tele- phone Interface I1 allowing the

TRS-80 t o communicate with another TRS-80 as a host terminal combination. Also lets you transfer programs between TRS-80s. Con- tains 5 cassettes. 16K Level 11 required.

26-1146

. . . . . . . . . . . . . . . . . . . . .

29.9!

TRS-80 Mini-Disk System

-

Fast, Efficient Mass Storage

Store

Large Amounts of Data andProganuforALPorrt

Instant Acceu

The system diskette containing TRSDOS and Disk BASIC must always be in your first drive unit. TRSDOS allows you to copy a diskette (BACKUP) even in a one drive system. For Mini-Disk drive I, order

26-1160, 499.00. For Mini-Disks 11, III or order 26-1161,499.00 each.

U.BI

--,

5y4-bch

Magnetic Mini-Dmet-

Radio Shack's mini-diskettes are perfect for use with our mini-disk System. Each diskette is individually certified against defects and designed to meet TRS-80 standards. Extensive testing assures

The TRS-80 Mini-Disk system is a storage medium allowing immediate access to the large amounts of data and programs you will need for accounting, inventory control, mailing lists and other jobs. Up to 4 drives can be attached through the Expansion Interface, fur- nishing 49,900 to about 307,000 bytes of on-line storage. The first Mini-Disk drive you purchase includes our powerful

TRSDOSm (Disk Operating System software) and Disk BASIC on diskette.

This diskette allows about 50K of user storage space. TRSDOS and Disk BASIC use about 10K of the TRS-80's RAM, so a minimum of 16K is required, along with

Level II and an Expansion Interface.

Each of the diskette's 35 tracks consists of ten 256-byte sectors. Certain system information and a directory are required on each diskette, leaving 85,760 bytes of space available (each) on the second, third and fourth drive.

Attach Up to

4 Drives for

On-Line Storage of 307,000 Bytes

as 26-0305, 5.95, or in a pack of 3 as

26-0405,16.95.

Quantity Savings on Blank

Diskettes

-

3-Packs Only

Quantity Each

1-4

5-9

10-19

20-Up

16.95

15.95

13.95

11.95

3% minutes to load from cassette tape

(Level II) d load in less than 20 s e e onds from disk. And you may read information one file after the other

(sequential), or go directly to any sector without reading the preceding files

(random).

Specifications

Disk

Format: 35 Tracks; 10 Sectors per Track;

256 Bytes per Sector; 89,600 Bytes per Disk- ette. Disk Size: 5V4" floppy disk. Data Ransfer

Rate: 12,500 bytes-per-second. Diskspeed:

300 RPM. Latency: 100

mS

cross

all 35 t r a c k s . ~ v e r a ~ e > a c k u p minutes (including formatting). Memory

Us-

age: TRSDOS, 4.2K

R A M ;

Disk BASIC, 5.8K

RAM. Power: 12OVAC. 60

Hz, 35 watts. listed. Size: 6'/2~3'/zx13~/4"

U.L.

Diskette Storage Box

Static-free design protects up to 50 mini-diskettes. Adaptable to hold cassette tapes. Boxes are stackable.

Smoke-tint cover, durable molded plastic. 6-5/16x10-1~16x7-11/16".

26-1450

. . . .

.

. .

.

.

.

.

.

.

.

. . . . . . . . . .

19.95

Note: All accessories in this catalog may not b e stocked a t some stores a n d dealers.

1.

Powerful Disk

BASIC and

TRSDOS

Operating

Systems

TRS-80 Mini-Disk System Also

Provides Powerful Enhancements to Radio Shack's Level

I1

BASIC

TRSDOS Programs

Included in TRSDOS is the software needed to operate the disk system, plus certain programs for file management, called Utilities.

On power-up, TRSDOS is automatically loaded into

RAM, occupying 4.2K. An overlay scheme is used so that only the needed portions of TRSDOS use RAM space a t any given time. When Disk

BASIC is called in, an additional 5.8K bytes are required for each file the user requests, up to 15,hence the minimum

RAM requirement for use of a Mini-Disk system of 16K.

Radio Shack intends to continually up- grade TRSDOS, adding new features with each new version, so check with your local Radio Shack store for information of the latest available version. For reference, here are some of the features of TRSDOS 2.2.

Radio Shack Disk BASK:

TRSDOS will load and enter Disk BASIC whenever the command BASIC is entered. Typing CMD "S" under BASIC will return control to TRSDOS.

BASIC 2.

Type BASIC 2 and the TRS-80 will be in Level I1 BASIC with full RAM available. Disk BASIC enhances Level I1 with the addition of several new commands.

File Commands:

CLOSE

. file must be reopened for use.

DISKDUMP

-A program to write a disk file to the sector by sector in hex code and ASCII, 16 bytes a t a time. Shows how data formats are stored on a disk.

EOF

-

Function to check for end of file.

GET

-

Reads a specified record from a random file into the file's associated buffer.

FIELD

-

Specifies the format of a random file record.

INPUT#filenumber

-

Reads from a sequential file.

KILL

-

Deletes a file.

LINE INPUT

-Reads a n entire line of data, ignor- ing delimiters.

LOAD

-

Loads a BASIC program from disk into memory

LOF

-

Returns highest physical record number used in a file.

LSET/RSET

-

Places data into a random file buffer in preparation for a write to disk.

MERGE

-

Combines a BASIC program with another program currently in memory.

NAME (BASIC R only)

-Renumber the lines in a

BASIC program.

OPEN

-

Opens a file for use. This command specifies sequentiWrandom input or output, the file number and file name.

PRINT#filenumber

PUT

-

Write to a sequential file.

-

Writes data from a buffer to a specified record number in a random file.

SAVE

-

Saves a BASIC program onto disk. (You can CLOAD a tape program, then easily put it on disk.)

utilities:

APPEND

-Adds one file to the end of another

(primarily data files).

ATTRIB

-Assigns or changes protective file passwords with 5 levels of protection to prevent unauthorized file access.

AUTO

-Automatically executes a command on power-up

BACKUP

-

Copies all of a diskette to another diskette (works even on a one dnve system by swapping disks back and forth)

CLOCK

-

Provldes constant time display in the upper right corner of the v ~ d e o

COPY

-

Copies a file.

DATE

-

Sets the date which can be accessed by

TIME$ in Disk BASIC.

DEBUG

-

Machme language debugger, allowing you to set break points, execute single-step instructions, dynamically watch registers during execution and display memory in hexldecimal or ASCII.

DIR

-

Displays a directory of all files on a specified disk drive. If requested, will include logical record length, end of file and space used.

DUMP

-

Stores a machine language program from memory to disk.

FORMAT

-

Format and verify a blank diskette.

Unusable sectors are marked.

FREE

-

Dis~lavsfree sDace remainina on diskettes in all dhves.

GETDISK

-

Copies any disk file or machine language program onto cassette

GETTAPE

-Reads cassette data and wrltes it into a disk file.

KILL

-Deletes a file, makmg space avalable for reuse.

LIB

-Displays all TRSDOS system commands

LIST

-Lists a file to the video display

LOAD

-Loads a machine language program from disk to memory

PRINT

-Lists a file to the line prmter.

PROT

-

Changes protection status of all non- system files on a diskette.

RENAME

-

Changes the name of a file.

TAPEDISK

-Loads svstem taDes into RAM, then to a specified disk file.

TEST1

-

Program to test the TRS-80's memory, read only and random access.

TEST2

- A BASIC program stress test for the en tire disk system.

TIME

-

Sets the time of day for the CLOCK display and TIME$ BASIC command.

TRACE

-

Prints the program counter on the video display

BASIC

*.

Allows reloading and reentry into Disk BASIC from TRSDOS and restores a program that was in resident when you exited BASIC.

BASICR.

line renumber (NAME).

BASICR*.

from TRSDOSm and restores a program that was in resident when you exited

BASICR.

Enhanced Disk BASIC with

Reloads and enters BASICR

Disk BASIC and BASICR allows either random or sequential disk files. Pro- grams may be stored in BASIC as ASCII or compressed format files.

All

files are named. A Filespec name may consist of an 8-character name, a 3character extension, an &character password and a specific disk drive number. (All except the file name are optional.)

Extension Commands:

CMD

" D -Calls up DEBUG (see DOS).

CMD "I"

-Exit to TRSDOS and issue a command.

CMD "R"

-Restarts the 25 msec heartbeat

(should h e on for disk operat~ons).

CMD "T"

-

Turns off 25 msec heartbeat. Thismust he done before cassette YO is done.

DEF FN

-Allows user-defined functions.

DEFUSR

-Defines an entry point for one of 10 user machine language routines.

HEX CONSTANTS

-You can type-in hexadecimal and octal constants by preceding them with " & H

01

"&."

INSTR

-

Tells vou the ~ o s i t i o n another.

MIDS

-

Allows

MID$

on the left side of an equa tion.

TIMES

-Returns date and time as a text string.

Time and date are set by the TIME and DATE commands under TRSDOS.

USRn

-

Calls one of 10 possible machine language routines. You can both send and return an argu- ment.

The following functions are available to convert numbers to text and back again. This way a 5-digit integer may be stored as 2 bytes rather than 5

ASCII characters, saving dmk space.

Type mteqer singe precis~on double precision

Convert to Convert to text numenc Bytes

MKIS

MKS$

MKDS

CVI

CVS

CVD

2

4

8

Manual and Disks May Be

Purchased Separately

Most items are available on Special Order for fast delivery Ask about delivery times.

Business-

,

Related

Software

Tape Mailing List. 80 names per data file with 16K. 3 2 K cassette system will hold 2 5 0 names. 26-1503. (16K Level I1 required)

.

19.95

Disk Mailing List. Selective printing from one of seven key fields. Approx. 6 0 0 names per data diskette, or 2 0 0 names on system diskette. 26-1551. (16K Disk)

. . . . . . . . . .

39.95

Business Mailing List. Fast sort in Zip Code or any other sequence. 3 2 K "Business Sys- tem"-990 names. 4 disk (48K) - 2 9 7 0 names. 26-1558. ( 3 2 K disk)

. . . . . . . . . . . .

99.95

General Ledger I. 2 4 0 entries per session and 1830 per month with up to 100 accounts.

26-1552.( 3 2 K Disk)

. . . . . . . . . . . . . . . . . . .

99.95

Inventory Control I. Retail inventory record keeping and control-up to 1 0 0 0 items.

Tracks vendors, backorders, order dates, out of stock and on-order items.

26-1553. ( 3 2 K Disk)

. . .

.

. . . . . . .

99.95

Manufacturing Inventory Control. Raw materials inventory for 1900items. Up to 2 0 finished goods per diskette. Prints bill of materials, material requirements and more.

26-1559.( 3 2 K Disk)

. . . . . . . . . . . . . . . . . .

199.95

Accounts Payable. 7 5 vendors 1 0 0 0 transactions, or 2 0 0 vendors

800 transactions per month. Prints checks, register cash flow analysis and summary of activ- ity for posting General Ledger.

26-1554. ( 3 2 K Disk)

. . . . . . . . . . . . . . . . . .

149.95

Accounts Receivable. 300 customers 1 0 0 0 transactions per month or 100 customers

2 0 0 0 transactions per month. Prints aged reports, monthly statements, and summary

For posting general ledger.

26-1555.( 3 2 K Disk)

. . . . . . . . . . . . . . . . . .

149.95

Fixed Asset Accounting. Control over fixed asset depreciation.

26-1560. ( 3 2 K D i s k )

. . . . . . . . . . . . . . . . . . .

79.95

Time Accounting Package. Attorneys, CPAs and Job Contractors. 750 clients 1250 charges per month. Up to 2 6 user-defined charge codes, up to 5 partners with different rates. 26-1561. ( 3 2 K Disk) . . . . . . . . . . . .

199.95

Disk Payroll. 100 employees and 1 4 userdefined earnings and deductions categories.

Prints payroll checks and W-2 forms for any state. 26-1556.( 3 2 K Disk)

. . . . . . . . . . . .

199.95

Level I Cassette Payroll. Calculates paychecks, including tax and other deductions. Stores year-to-date and quarter- to-date info for 11 employees.

26-1501.(4K, L I)

. . . . . . . . . . . . . . . . . . . . .

19.95

Level I1 Cassette Payroll. 1 6 K cassette holds

15 employees, 3 2 K holds 75 and 3 2 K Disk holds 4 0 . Prints checks and register. Sup- ports fixed-percentage state and city tax.

26-1504.(16K L

II

or 3 2 K Disk)

. . . . . . . .

.49.95

Real Estate Vol. I. Stepped income analysis, compound interest, internal rate of return, resale price. 26-1571.(16

K,

L 11) . . . . . . . .

29.95

Real Estate Vol. 11. Mortgage analysis.

26-1572.(16K , L 11)

. . . . . . . . . . . . . . . . . . .

.29.95

Real Estate Vol.

111.

Detailed property income calculations, appreciatioddepreciation estimates. 26-1573.(16 K, L

II)

. . . . . . . .

.29.95

Real Estate Vol. IV. Ellwood analysis, overall capitalization rate, graphic analysis, sensitiv- ity analysis. 26-1574.(16K , L 11) . . . . . . . .

29.95

Real Estate Vol.

V.

Programs for cash flow and depreciation.

26-1575.(16K L 11)

. . . . . . . . . . . . . . . . .

.*

29.95

Real Estate Vol. VI. Building development,

Monte Carlo time trend, decision tree analysis. 26-1576.(16K L II).

. . . . . . . ..*

29.95

Statistical Analysis. Random sample, his- togram, descriptive statistics. T-test, simple correlation, linear regression.

26-1703.(4K L I)

. . . . . . . . . . . . . . . . . . . .

.29.95

14

TRS-80

Library of

Ready-to-Run Software

(Business Software continued)

Advanced Statistical Analysis. Advanced versions of 26-1703 programs plus frequency distribution. Multiple linear regression, time series analysis.

26-1705. (16K, L 11)

. . . . . . . . . . . . . . . . . .

.39.95

Concrete Take-Off. Foundation and struc- tural cost estimating for contractors. Calcu- lates material requirements, labor compo- nent, productivity and waste.

26-1557.( 3 2 Disk)

. . . . . . . . . . . . . . . . . . .

199.95

Word Processor Disk. Enter and edit text on video screen, save text on disk, output formatted copy to printer. Buffered input for high speed typing without dropouts. Stop tabs, horizontal and vertical centering, formatted headers and footers, automatic page numbering, block manipulation and more.

26-1563.( 3 2 K Disk)

. . . . . . . . . . . . . . . . . .

.99.95

Word Processor Cassette. Same as above with text storage on tape.

26-1505.(16K, L 11)

. . . . . . . . . . . . . . . . . . .

69.95

FORTRAN and Assembly

Language Software

TRS-80

FORTRAN. Compiler, editor, linking loader, library. 26-2201. ( 3 2 K Disk)

. . . . .

99.95

Disk Editor Assembler. Macro-assembler, linking loader, editor, cross reference.

26-2202. ( 3 2 K Disk)

. . . . . . . . . . . . . . . . . .

99.95

Editor Assembler. Standard Zilog

Mnemonics for assembly language combined with the convenience of a text editor. For advanced programmers. Cassette only.

26-2002. (16K, L I or 11) . . . . . . . . . . . . . . .

.29.95

T-Bug. Machine language monitor. For advanced programmers.

26-2001. (4K,

. . . . . . . . . . . . . . . . .

14.95

Programming Aids

Renumber. Renumber all or art of BASIC

. . . . . . . . . .

9.95

Double Precision Subroutines. Obtain 15 digit accuracy with sine, cosine, arctangent, natural logarithm, exponential and square root functions. 26-1704. (4K, L 11)

. . . . . . .

9.95

Personal

In-Memory Information. Computerized card filing system. 26-1502.(4K, L I or II)

. . . .

Personal Finance. Balance checkbook,

19.95

maintain monthly budget.

26-1602. (4K, L I)

. . . . . . . . . . . . . . . . . . . . .

14.95

Budget Management. Up to 6 0 budgeted accounts with 2 5 cash expenses. 2 0 savings transactions. 50 checks per month. Prints various reports. 26-1603. (16K, L 11)

. . . .

19.95

Cassette Portfolio Analysis. 3 programs:

"Buy and Sell" for stocks, funds and bonds.

"Summary" computes long and short term capital gains. "Options" tracks up to 1 0 positions, computes returns and unrealized gains. 26-1506.(16K, L 11)

. . . . . . . . . . . . .

29.95

Standard & Poor's Portfolio Management and Security Selection System. A complete stock analysis and portfolio management package. 26-1507. ( 3 2 K Disk)

. . . . . . .

Ir

49.95

Educational

Math I. Teaches fundamentals of arithmetic.

26-1701. (4K, L I)

. . . . . . . . . . . . . . . . . . . . .

19.95

Algebra I. 6 self-paced lessons on 3 tapes.

26-1702. (4K, L I)

. . . . . . . . . . . . . . . . . . . . .

19.95

1.0. Builder. 8 tapes with 38 programs on vocabulary, antonyms, synonyms, analogies, number series. 26-1706. (4K, L I or 11) .

.

29.95

Level I BASIC Course. Self-paced course teaches Level I BASIC for

TRS-80.4

tapes.

26-2003. (4K, L I)

. . . . . . . . . . . . . . . . . . . . .

12.95

Level I1 BASIC Course Part I. 4 cassettes in- troducing TRS-80 Level I1 BASIC.

26-2005. (4K, L 11)

. . . . . . . . . . . . . . . . . . . .

14.95

Level I1 BASIC Course Part 11. Interactive self-paced course on advanced Level I1

BASIC. 4 tapes. 26-2006. (16K,

L 11)

. . . .

19.95

(Educational Software continued)

Disk BASIC Instru&on.

A self-paced course in

Disk BASIC covering DOS commands, random and sequential files, aU disk additions ta

Level II BASIC.

26-2007. (16K

Dxsk)

..................

.29.Q5

Teacher

Aide. Classroom management system designed to assist teachers with student personal information, grade processing and averaging. Up to 35students.

26-1713. (16K, L IJJ

..................

.29.96

TRS-80 Hands-on BCL (Basic Computer eracy] Padrage. Includes: Student Guide,

Teacher Guide, Algebra I, Program World,

Level

Il

BASIC Course Part

I.

26-1708.

L II)

1,

(a,

..................

10O.m

1

Games

BEaclrigGk Backgariunob. Fast paced fun!

26.1802 ($K Level I)

. . . . . . . . . . . . . . . . . .

.4.95

26-1803,

f4H Level II)

"QuiQk Watson"

Deduction

26-1802. ( 4 K L I or

II)

.................

Game.

.4.95

Games Pack 1. Checkers, Hammurabi, Draw,

Star Pilot, Random Tic-Tac-Toe, Space

26-1805, (4K, L

I)

..................

4.95

....................

Casino Games.

Pacb.

Craps, Keno, Slot

Taxi.

.19.95 1

I

'

Machine, Roulette, Wheel of Fortune and

Baccarat. 26-1806, (16K, L

II)

..........

19.95

Micro Chess. 3levels of difficulty For begin-

' ning or advanced players.

26-1901.

(4K,

L I or II)

.................

19.95

Micro Movie. Draw and play back animated

"movies"

on

TRS-80 video monitor.

26-1903, ( l I K , L

I

or 11)

................

.9.95

Micro Marquee. Create

l-inch

high letters moving up your TRS-80 screen. 13characters per line. 26-1904. (4K, L I or In

.........

.4.95

Micro Music. Five octave range with sharps and flats, whole, half, quarter and eighth notes. 26-lB02.

(4K, L I or II)

............

9.95

Flying Saucer. Shoot 'em down in "real time" with your laser cannon.

26-1905. (4K, L Ior

II)

..................

9.95

Invasion Force. Command a space ship via

TRS-80 keyboard. Destroy the aliens before thev destrov vou!

. . . . . . . . . . . . . . . .

24.95

Checkers 80. Competition "farced jump" game with two levels of skill.

26-1907.

(16K,

L I or IIJ

.................

9.95

Artificial

Intelligence. Discuss your problems with "Eliza."

26-1908. (16K, L

I

or 11)

..............

. I 4 9 6

'

Communications

RS-232C Communications Software. 3 programs: "COMPAC" transmits a program or remote terminal. "TERM" from a makes

TRS-80 a dumb terminal. 26-1146. [16K, L II)

. . . .

29.95

.

I

Important Notice

All Radio Shack Computer Programs

Are Distributed on a n "As Is" Basis

Wi%hout Warranty

consesueatial damaaes resultma from the use or of such computer or compute^

Gograms orrerM&lid data and m ihe premously m use for a penod of M e adequate to msure that results of

operation

of the computer ar program are eatlsfadow.

. % I

"Engineer"

16K

System

16K Level I1 Complete

System (26-1056)

Printer Interface

Cable (26-1411)

Quick Printer (26-1153)

Space-Saver Desk

F

(26-1304)

,

"Professional"

16K

System

16K Level 11 Complete

System (26-1056)

Expansion Interface

(26-1140)

Mini-Disk System

(26-1160)

Quick Printer, Cable

(26-1153, 26-1401)

System Desk (26-1301)

"Business"

32K System

32940°

16K Level I1 Complete

System (26-1056)

Expansion Interface,

16K

4

2 Mini-Disk Systems

(26-1160, 26-1161)

Line Printer I1 and

Cable (26-1154, 26-1415)

"Deluxe

Business"

32K

System

16K Level 11 Complete

System (26-1056)

Expansion Interface,

16K RAM (26-1141)

*

2 Mh-Disk Systems

(26-1160, 26-1161)

Tractor Feed Line

Printer, Cable

(26-1152, 26-1401)

System Desk (26-1301)

Line Printer Stand

(26-1302)

Our

Most

Popular

TRS-80

For more technical applications, the "En- gineer" system combines powerful Level I1 with 16K of RAM. The new Printer Interface cable allows direct connection of the Quick

Printer to TRS-80's bus connection, without using the Expansion Interface. Quick Print- er provides 80-column hard copy .and program listings. The Space-Saver holds the entire system and provides the user with ample work space.

Mini-&sk for expanded language, fast data handling and approximately 49,900 bytes of user disk storage space. Quick Printer provides 80-column hard copy and program listings. System Desk holds the entlre system with plenty of work space left over.

Two mini-disk units g v e user approximately 135,600 bytes of disk storage.

Vxtually

all

TRS-80 disk-based business software requires this as a minimum system. Applications include general ledger,

1 payroll, disk mail list and more. Line Printer

I1

adds real versatility and convenience to this system, without taking up a lot of work space.

Approximately 135,600 bytes of disk storage space from the two mini-disk systems.

Tractor feed line printer uses fanfold paper with feed holes in the margins and will pro- duee up to 5 carbon copies. The System

Desk has recessed spaces for the Expan- sion Interface and keyboard with intercon- necting wiring concealed. Line printer stand leaves more desk space.

TRS-80

~ i n e

Printer I

TRS-80 Line Printer I is a medium-speed

5x7 dot matrix impact printer suitable for business, education and home use. It uses the standard 64-character upper case ASCII character set, but does not support TRS-80 graphics.

It uses only fanfold paper with feed holes in the margins and will produce up to 5 carbon copies. A continuous-loop cloth ribbon lasts approximately a s long a s a standard typewriter ribbon.

The width of the letters, or "print density," is continuously variable from 10 to

16.5characters per inch. Print density af- fects print speed. At maximum density, the printers

wdl

produce 132-character lines at a speed of 21 lmes per minute.

Tractor-feed is required for multiple copies and exact placement of type on preprinted invoices, payroll checks, etc.

Tractor width is adjustable from 3 to 11.5 inches. Top of forms control is available through software.

Requires Level 11(or Disk BASIC), a con- necting cable and Expansion Interface.

All

Level

I1

PRINT commands except

PRINT@ can be used (preceded by an

Includes manual.

26-1152

. . . . . . . . . . . . . . . . . . . . . . .

1559.00

Mod I

Printer Cable. 26-1401

. . . . .

.39.00

Mod I1 Printer Cable. 26-4401

. . . .

.39.00

Ribbon. 3 pack. 26-1413

. . . . . . . . . . .

18.95

Paper. Fanfold 9Yzx11". 26-1403

Mail Labels. 26-1404

. . .

37.95

. . . . . . . . . . . . .

19.95

TRS-80 Line Printer Specifications

Print Density: 10-16.5characters perinch ( u p to 132 characters per line). Print Width: Up to 8". Print

Speed: 60-100 characters per second. Vertical Line

Spacing: 6 lines per inch. Dimensions: 9.5 x 19.8 x

19.5".

Weight: 45 lbs. Power: lZOVAC, 5W60 Hz,

3

Amps. 360 Watts. U.L. listed.

Quick

Printer I1

A "mini" line printer priced to fit everyone's budget. And best of all, it can connect directly to your TRS-80 it needs no Expansion Interface. Software selectable for 16 to 32 character lines.

Prints upper and lower case and features automatic "wrap-around" when text ex- to overflow.

A

built-in microprocessor controls the printer and communications with other units. With three interface choices, this versatile printer can be used on a variety of computers. Get low-cost, hard copy output on a Z3/8"- wide roll of aluminum-coated paper. Includes cable to connect to CPU.

26-1155

. . . . . . . . . . . . . . . . . . . . . . . .

219.00

Cable for Expansion Interface.

26-1406

. . . . . . . . . . . . . . . . . . . . . . . .

19.95

Paper. (2 rolls) 26-1412

. . . . . . . . . .

3.95

Quick Printer I1 Specifications

Print Density: 18 or 9 characters per inch, software selectable (32 or 16 cpl). Print Speed: 120 hnes per mmute. Paper: Aluminum coated, 2%'' wide (available through Radio Shack stores). Dimensions:

3-5/16x6-314x9-1/4".

power: IZOVAC, 60 Hz. U.L. hsted.

Line Printer

I1

Prints 50 characters per second on &inch lines of 80 characters each. Also prints expanded (wide) letters under software control. Features upper and lower case letters in a 7x7 dot matrix format and

wdl

operate in both friction-feed and pin-feed modes. Continuous forms 9% inches wide (original and up to two copies) are kept in precise alignment by nonadjustable pins built onto the platen.

Also prints single sheets. When used a s a friction-feed unit, inexpensive roll paper fits in a detachable rear

bail.

26-1154

. . . . . . . . . . . . . . . . . . . . . . . .

Mod I Cable. 26-1415

Mod I1 Cable. 26-4402

Roll Paper. 26-1402

. . . . . . . . . . .

970.00

. . . . . . . . . . . .

.29.00

.29.00

. . . . . . . . . . . . .

.19.95

Ribbons. 3-pack. 26-1413

. . . . . . . .

.18.95

. . .

37.95

Line Printer I1 Specifications

Prmt Density' 8-inch hnes of 80 characters each

Print Speed: 50 characters per second. D~mensions.

15~11x5'.10

lbs Power 120VAC, 60 Hz 200 watts

Attach Uuick Printer,

L i n e

-

Printer I or Line Printer

I1

to

Your Level

I1

TRS-80 Bus without Expansion Interface

Printer Interface Came. Lets you add a complete hard copy system without usmg the Expansion Interface. Connects &ectly from the TRS-80 bus connector to the

Quick Printer or Line Printer I.

26-1411 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Line Printer I1 Interface

Cable.

Interfaces with Line Printer I1 without using the

Expansion Interface. Connects directly to TRS-80 bus connector.

26-1416 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Quick

Printer

Delivers 150 lines per minute on 4.75- inch wide alurninum-finish paper. No nbbon is needed. The paper is unaf- fected by light, heat or humidity. Prints all keyboard characters (except arrows), and upper and lower case letters.

Graphics are not supported. Variable character width (20,40 or 80 characters per line), automatic underlining and an audible signal are all fully software controllable.

All

Level-I1 line printer commands are used. Features paper-empty light, print select (on/ofD, paper advance and power onloff switch with pilot light.

r

Requires either Expansion Interface,

Printer Cable and Level

I1

BASIC or

Printer Interface Cable and Level

I1

BASIC.

;

26-1153

. . . . . . . . . . . . . . . . . . . . . . . .

499.00

Mod I Printer Cable. 26-1401

. . . . .

.39.00

:-

Mod I1 Printer Cable.

. . . .

.39.00

Paper. (3 rolls) 26-1405.

. . . . . . . . . . .

16.95

Quick Printer Specifications

Pn-nt Density: 20,lO or 5 characters per mch, software selectable (80, 40 or 20 cpl). Print Speed:

150 llnes per minute. Paper: Aluminum coated roll,

4 . 7 5 wide by 131' long. (Available through Radlo

Shack stores) Dirnensfons: 41/4x13x10'/z". 10 Ibs.

Power: IZOVAC, 60 Hz. 40 Watts.

U.L.

Note: All TRS-80 printers used with a Model I require

L e v e l I1 BASIC o r D i s k

BASIC.

The Level I TRS-80 cannot be used with a printer.

Printer I11

For applications requiring higher speed and full 13-inch wide, 132-character lines,

Radio Shack's new Line Printer 111 is the answer! This quiet, professional printer includes many outstanding features.

.. even "self-test!"

9x7 dot matrix upper and lower case letters, as well a s numbers, are printed at a fast 120 characters per second. For even faster "throughput," the head prints in both directions as it moves across the paper. Accurate positioning of preprinted forms such a s invoices or checks is easy, with controls for line-feed in in- crements as small as 1/8th-line. Ex- panded (wide) characters may be software selected for headings or em- phasis in your printed reports.

The fully adjustable tractor mechanism feeds continuous forms of varying width up to a maximum of 15 inches, while as- suring accurate alignment. Drive motors run only during actual printing, so Radio

Shack's Line Printer 111 can always be si- lently awaiting your print command, on either TRS-80 Model I or Model 11.

For the finest in fast, versatile printers, speclfy Radio Shack's all new, exclusive

Line Printer

III.

26-1156

. . . . . . . . . . . . . . . . . . . . . .

.1960.00

Mod I Printer Cable. 26-1401

. . . . .

.39.00

Mod

I1

Printer Cable. 26-4401

Ribbon Cartridge. 26-1414

. . . .

.39.00

. . . . . . . .

21.95

14%xll"

. .

.49.95

Mail Labels. 26-1404

. . . . . . . . . . . . .

19.95

Line Printer 111 Specifications

Print Density: 10 or 5 characters per inch, software selectable. Print Speed: 120 characters per second.

Dimensions: 7-2/5x24-35x15-9/10': 42 pounds.

Power: IZOVAC, 47 to 63 Hz, 85 W.

Printer

Stands

Line Printer Stand. Line Printer I and a number of others attach directly to the stand's crossmembers through existing holes in their rubber feet. The "modesty panel" turns sideways to accommodate many popular 15"-wide printers. (Not

Line Printer

26-1302

III)

. . . . . . . . . . . . . . . . . . . . . . . . . .

99.00

EC

Line Printer

I11

Stand. Puts the printer right at your fingertips and frees deskspace. Includes basket.

26-4302

. . . . . . . . . . . . . . . . . . . . . . . .

139.00

Model

I1-An

Exciting

N e w Member of the

TRS-80

Family!

Easy to Operate

Fast and Expandable

32K or 64K of

R A M

Upper and Lower Case

Direct Memory Access

Built-in 8" Diskette

32K,

1-Disk TRS-80

Model I1 System

64K,

1-Disk TRS-80

Model I1 System

Anyone accustomed to a typewriter will feel right at home at the Model I1 keyboard. We kept it sunple, with as few

"special" keys a s necessary to do the lob.

A calculator-style keypad

IS

provlded for faster, more accurate numenc entry

Model II's easy-to-read 12-inch, high- resolution video screen displays 24 lines of 80 upper and lower case characters per line. (Double-width characters -40 per line-can also be selected by your program).

Inside Model I1

Internal memory (depending on the system you choose) will store 32,000 or

64,000 characters of mformation. The requlred "Operatmg System" software oc- cupies about 27,000 characters, with the balance available for user programs and data. The built-m 8-inch disk drive will store an additional 416,000 characters.

(That's equal to about 20 straight hours of typing at 70 words per minute!) The three additional disk drives you can add, each store another 486,000 characters, bringing Model II's total memory capacity to about 2 mdlion characters.

Experienced data processing people will recognize the terms "direct memory access" and "vectored interrupts," which to the average business user translate a s faster operation and more versatility The fast Z-80A microprocessor-the heart of

Model 11-operates at a speed of

4

MHz

-over twice the speed of TRS-80 Model

I. Separate keyboard and vldeo pro- cessors also add to Model II's speed.

User-Oriented

Each time you turn on Model 11, it automatically "self-tests" to assure proper operation. Features in Model II's pro- gramrmng language allow an operator to turn the system on, and be ready to run payroll, posting, billing or other lobs immediately, without any action other than entenng the current date. Model

II is

"forgving" of operator errors, too. If you try to load a program when there's no disk in the drive, Model I1 won't hang up hke many other computers. And, when you give Model

11

a command such a s to

"kill" a file, it always responds with posl- tive feedback.

.

.telling you exactly what it did (or did not do) in response to your command. When an Operating System error occurs, a message appears on the video screen with a numbered error code. And no flip charts or manual are requlred if you don't remember the error codes. Just type "Error 32" (or whatever the number) and Model

II

will respond with a detailed explanation.

Model I1 i s Expandable

Llke TRS-80 Model I, Model 11systems are expandable to meet changing-or growing-needs. Three expansion connectors (one parallel and two serial) allow you to connect printers, plotters, digitizers, telephone communications and many other external devices. Inter- nal plug-in card slots allow for more expansion and enhancement options in the future.

. .

several are in the planning stages now.

If your application requires more disk storage, you can plug in a Model

11

Disk

Expansion Unit with one, two or three additional drives If you select an Expan- sion Unit with one or two drives, you can add the others later. Of course, a 32K system (32,000 characters of memory storage) can be expanded to the full 64K at any tune our expanded Level 111BASIC programming language and our all-new, command-compatible

"TRSDOS" operatmg system. This "system software" wdl be upgraded periodically with new features, and we plan to offer additional programming languages for Model

II m the future Applications software for

General Ledger, Ipventory Control, Re- cewables, Payroll and Malllng List

IS avadable now, and more wdl be avallable soon.

32K, 1-Disk Model 11.26-4001

64K, 1-Disk

Model

11.26-4002

32K Add-on

... . .

.

.

.

. . . .

.3450.00

3899.00

. . . . . . .... . . .

.

449.00

19

Level

I11

BASIC

and

TRSDOS Disk Operating System

TRS-80 Model I1 computers contain a very small amount of Read-Only-Memory (ROM), which performs power-on diagnostics, then automatically loads the Operating System from disk. The ROM is electrically replaced by RAM, for a total of 32 or 64K, depending on the Model-I1 system you have.

Model II's 8-inch diskettes contain 76 acces- sible tracks of 25 sectors each

a sector contains 256 bytes. A "gran" is 5 sectors. The sysiem diskette (which must always be present in Model II's built-in disk drive) has

65 tracks, or about 416,000 bytes of storage available for your data and programs. On non-system diskettes, 75 tracks

about

486,000 bytes

are available to the user.

Disk rotation speed is approximately 360

RPM and data is transferred from disk at about 62,500 bytes per second, 5 times the speed of TRS-80 Model I's Mini-Disk system.

Model II's "Level 111 BASIC" -an expanded version of Level

I1

and a new, command- compatible TRSDOP Disk Operating Sys- tem occupy some 70,000 bytes on the system diskette. An overlay scheme allows it to require only about 27K of RAM, leaving 5K free in a 32K Model I1 or 37K in a 64K system.

Command compatibility has been main- tained to the greatest possible extent for the convenience of Model I owners who decide to move up to the additional speed and capability of TRS-80 Model 11.

The system uses numbered error messages which ap- pear on the video screen in a reversed field.

For convenience, you can type the number of the message and receive a definition of that message on the screen.

The commands listed to the right are com- mon to both the TRS-80 Model I and Model I1 languages. Operating System commands are in bolder type.

A few of these commands have a slightly different use in Model 11. For example,

"SYSTEM" is used to enter DOS and (option- ally) execute a DOS command with return to

BASIC. A number of the commands also include more options in the Model 11 language.

You will note the absence of PEEK, POKE,

INP and OUT, which are no longer needed.

Machine language subroutines are entered easily using Model II's improved "DEBUG" utility, and previously "POKED" values such as top of forms are handled by their own unique commands.

While BASIC programmers familiar with

Model I will feel right at home, machine language piogrammers will find a totally new and different architecture "under Model II's hood." We think you'll agree it's quite an im- provement in all respects.

In addition to the commands listed, Level I11

BASIC and Model I1 TRSDOS have the following additional commands, not part of the

Model I system:

AGAIN-Causes the last command executed to repeat.

BUILD-Allows building a file for automatic command entry in place of keyboard entry, executed with the "DO" command.

CREATE-Creates a named file and allo- cates disk storage space for it. Having pre- allocated space allows faster file handling in

BASIC. (Space can be dynamically located.)

DO-Executes a file created with the

"BUILD" command. By using "AUTO DO," a

BASIC program may be executed on power- up, without operator entry.

ERASE-Cancels a dimensioned array and frees its memory space.

ERROR-Returns a n explanation of a specified error number.

FORMS-Formats the line printer-top of forms, length and width of forms, and can send one character to the printer for testing forms positlonmg.

HEX$-Converts a decimal number to a hexadecimal string.

NULL-Sends blanks at the end of a line

(communications).

OCT$-Converts a decimal number to an octal string.

PAUSE-Interrupts a "DO" file to require an operator action, such as inserting a diskette when instructed.

PURGE-Automatic "KILL" mode Lists all non-system files on a disk and asks if they are to be killed.

RENUM-Renumbers program lines.

RESET-Restores default system settings for all devlces.

SETCOM-Initiahzes commun~cationsdrivers for the serlal ports.

SPACE$-Prints a specified number of blank spaces.

SPC-Prints spaces on video display

SWAP-Exchanges the values of two named variables.

WIDTH-Sets line wldth for video display

ADDITIONAL OPERATORS: MOD,

IMP, EQV,

XOR (Integer Division).

Model II's new TRSDOS responds to your commands with positive feedback. If you say "KILL 'file-name' '', TRSDOS will respond with

"

'filename' KILLED", or

" 'filename' NOT FOUND'', so you'll always know what was or was not accomplished by your command. And backup (duplicatmg) of a diskette requues knowledge of a master password, which gives you additional program and data security.

These examples are taken from version 1.1 of our Model I1 system software. Of course,

Radio Shack will continue to enhance the

Level IIVTRSDOS Operating System for

Model I1 with new releases. Additional languages will also be made available and will be announced as they are released. Our abhty to expand Model II's language capabilities is enhanced because the system is RAM-based, and has no primary language in ROM.

TRS-80

Model

I1

"Starter System"

Basic, Powerful TRS-80 Model I1

System with Line Printer

-

Expandable as Your Needs Increase

An exceptionally affordable system with 486K bytes of disk storage (including operating system software), 64K internal memory (26-4002), a small pin-feed 9%-inch wide 80-column printer (26-1154) and a Line Printer 11 cable

(26-4402). Ideal for many businesses as it stands, yet instantly ready to be expanded as your business grows.

Approximately 416,000 Free Bytes of Disk Storage

Model I1 "Step-up

System"

64K System with Medium-Speed

Line Printer, Line Printer

Stand and Our System Desk

This expanded system is the perfect answer to inventory control or payroll for small businesses. Built around the TRS-80 64K Model I1

Feed Line Printer (26-1152), capable of produc- ing 132-character lines at a speed of 21 lines per minute. Also features the Printer Cable

(26-4401), Printer Stand (26-1302) and our

System Desk (26-4301) that holds the entire system and still provides ample work space.

Expand the memory capacity of this system by adding a n optional external disk system when you need it.

Approximately 416,000 Free Bytes of Disk Storage

Business System"

7998

00

A Very Powerful, High-Capacity

System with High-speed,

Wide Carriage Line Printer

Compare thls versatile and powerful system ing twice as much. Includes a 2-drive external disk system (26-4161), our 15-inch 120 CPS

Tractor-Feed Line Printer

III

(26-1156), and

Model 11System Desk (26-4301). Ideal for larger, integrated accounting systems.

Approximately 1,388,000 Free Bytes of Disk Storage

Model I1 "Deluxe 2

M e g a b y t e Business

System"

8737 00

Our most Powerful, "Full Bore"

Model

I1

System.

64K,

3-Disks,

High-speed Printer with Stand

This expanded busmess system features approximately

2,000,000 bytes of user &sk storage! 64K internal memory (26-4002) and a

3-dnve external dlsk system (26-4162) combme to give you maximum TRS-80 storage. Includes desk for Model

11

(26-4301), Line Printer 111

(26-1156) and Line Printer 111Stand (26-4302).

Approximately 1,874,000 Free Bytes of Disk Storage

Radio Shack has what it takes to be your small-computer company

Ray.,

COMPUTER

-

---

-

CENTER

Availability!TRS-80 Model I is in stock at most Radio Shack stores. You can see and try it before you buy.

Model

II

is on display in all

50 Radio

Shack Computer Centers and 100 special computer departments in major cities. You can order Model 11at

any

of our over 7000 locations.

Easy operation! Our widely acclaimed Level I users manual makes it easy, even fun, for a novice to learn computer programming.

Software!Prerecorded programs are available, now, to put your TRS-80

Model I or Model 11to work

immediately. And we are constantly expanding our line of programs.

Expand-ability!Modular design means even the smallest TRS-80

Model I system can be expanded to our largest Model I business system by using our plug-in accessories. The

TRS-80 Model I1business computer expands just as easily

After the sale! Your TRS-80 is in good hands with our expert technicians.

Over 100 company-operated repair centers nationwide service only our own computers, so w e know them

"inside out." And all 50 Radio Shack

Computer Centers nationwide offer classes for everyone from beginners to advanced programmers. Yes, we're in computers to stay!

The biggest name in little computersm

A DIVISION OF TANDY CORPORATION

FORT WORTH, TEXAS 76102

7000 STORES

IN

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