Important lnf ormation for Cassette
Users
Note: Model III BASIC on the TRS-80 Model III is essentially the same as Level
II BASIC on the TRS-80 Model I. All of the following references to Level II
BASIC also refer to Model III BASIC. The only difference is that a higher baud rate for saving onto tape can be set if you have a Model III with Model III B A SIC
(high = 1500 and low = 500) . Both low and high baud rate use the same volume s etting on the Model III.
Using Your Cassette Deck
Many factors affect the performance of a cassette system. The most significant one is volume. Too low a volume may cause some of the information to be mis s ed. Too high a volume may cause distortion and result in the transfer of background noise as valid information.
Four different cassette models have been supplied with the TRS-80 system the CTR-40, CTR-41, CTR-80, and CTR-80A. Each model has its own loading characteristics . The table below gives the suggested volume ranges for each of the CTR models.
Notice that the volume ranges for Level I and Level II are different. This is because the Level II data transfer rate is faster (500 baud vs. 250 baud). Also, notice that for the TRS-80 Model I, pre-recorded Radio Shack programs need a slightly higher volume setting than that required by your own csAVEd tapes.
This is because the pre-recorded tapes are produced with high-speed audio equipment at a slightly lower volume level than the csAVE process provides .
The Model III records at a lower volume than the pre-recorded tapes are recorded at , so the volume setting for user-generated tapes is higher than for pre-programmed tapes . You will need to take this into account when CLOADing
Level II programs into a Model III .
Recorder
Model
CTR-40
CTR-41
CTR-80 &
CRT-80A
User-Generated Tapes
Pre-Recorded
Radio Shae k Tapes
LEVELi LEVEL II LEVELi LEVEL II
YELLOW LINE RED LINE YELLOW LINE RED LINE
6-8 4-6 6.5-8.5 5-7
4.5-6.5 3-5 5.5-7 .
5 2.5-5
Recommended Volume Settings for Radio Shack Ca~sette Decks
When Used with the TRS-80 Model I
Recorder Model
User-Generated
Tapes
5-7
Pre-Recorded
Radio Shack Tapes
4-6 CTR-80, CTR-80A
Recommended Volume Settings for Radio Shack Cassette Decks
When Used with TRS-80 Model Ill
(With the CTR-40 , CTR-80, and CTR-80A, tum the control to the left to increase volume . With the CTR-41, tum the control to the right.)
When information is being loaded from the cassette tape, two asterisks will appear on the screen, The one on the right will flash on or off as the program is read in. If the asterisks do not appear, or the one on the right does not flash , then the volume setting is probably too low . Increase the volume and try again.
If you have a Model III this may be an indication that the tape's baud rate is different than the Computer's baud rate. (All Radio Shack Model I Level II prerecorded cassettes are recorded at 500 baud rate, so Low baud rate must be selected when they are loaded on the Model III.) Try resetting the baud rate from high to low or vice versa (See your Operation Manual) .
Use the reset button to stop the cassette and return control to you if loading problems occur .
Radio Shack programs are recorded at least twice on each tape. Following this practice when you record programs on tape will give you a back-up if one does not load properly or if it becomes damaged.
Important Note: The CTR-41 requires that you keep the supplied " dummy plug" in the MIC jack at all times . However, the other models should never be used with the " dummy plug ."
Level I
Sometimes you will get an error message during an attempted CLOAD. This means that some information was lost or garbled. Adjust the volume level slightly and try again.
Level II (Also Model
ill
BASIC)
In case of an error message, proceed as above . In Level II, there is also a rare case in which the program is not loaded correctly even though no error message is generated. So, after CLOADing a program, be sure to LIST it. If some data was garbled , then at some point in the listing the display will be filled with meaningless words and characters. Adjust the volume and try again.
Hints and Tips
Computer tapes should be stored in a relatively dust-free area (a cassette case is recommended) and protected from high temperatures. Magnetic and electrical fields may alter recorded information , so avoid placing the tape near them
•
(i.e
. household appliances, power sources such as transformers and television sets, etc.).
The cassette deck supplied with the TRS-80 is very compatible with the system and will perform its duties with great success. To keep the cassette deck in top condition and thus minimize your problems, you should periodically perform some routine maintenance on it. Dirty heads can cause as much as a 50% loss of volume. Also, heads become magnetized with use and may cause distortion. We recommend that you clean the head , capstan, and pinch roller after every four hours of operation. Heads on new recorders should always be cleaned before use.
Note: Cassette cleaning and demagnetizing accessories are available from your local Radio Shack store .
IMPORTANT NOTICE
· ALL RADIO SHACK COMPUTER PROGRAMS ARE LICENSED ON AN "AS
IS " BASIS WITHOUT WARRANTY.
Radio Shack shall have no liability or responsibility to customer or any other person or entity with respect to any liability, loss or damage caused or alleged to be caused directly or indirectly by computer equipment or programs sold by
Radio Shack, including but not limited to any interruption of service, loss of business or anticipatory profits or consequential damages resulting from the use or operation of such computer or computer programs .
NOTE: Good data processing procedure dictates that the user test the program, run and test sample sets of data, and run the system in parallel with the syste · m previously in use for a period of time adequate to insure that results of operation of the computer or program are satisfactory.
RADIO SHACK SOFTWARE LICENSE
A. Radio Shack grants to CUSTOMER a non-exclusive , paid up license to use on CUSTOMER'S computer the Radio Shack computer software received .
Title to the media on which the software is recorded (cassette and / or disk) or stored (ROM) is transferred to the CUSTOMER , but not title to the software.
B . In consideration for this license , CUSTOMER shall not reproduce copies of
Radio Shack software except to reproduce the number of copies required for use on CUSTOMER'S computer (if the software allows a backup copy to be made), and shall include Radio Shack ' s copyright notice on all copies of software reproduced in whole or in part .
C. CUSTOMER may resell Radio Shack ' s system anq applications software
(modified or not , in whole or in part) , provided CUSTOMER has purchased one copy of the software for each one resold . The provisions of this software
License (paragraphs A, B, and C) shll also be applicable to third parties purchasing such software from CUSTOMER.
RADIO SHACK A DIVISION OF TANDY CORPORATION
U.S.A.: FORT WORTH, TEXAS 76102
CANADA: BARRIE, ONTARIO L4M 4W5
TANDY CORPORATION
AUSTRALIA
280-316 VICTORIA ROAD
RYDALMERE , N.S
.
W. 2116
BELGIUM
PARC INDUSTRIEL DE NANINNE
5140 NANINNE
U.K.
BILSTON ROAD WEDNESBURY
WEST MIDLANDS WS10 7JN
8759015 - 381 PRINTED IN U.S.A.
