Installation Guide
AHA-2740A Series
EISA-to-Fast SCSI Host Adapters
The AHA-2740A Series:
AHA-2740A
AHA-2742A
AHA-2740A-Twin
AHA-2742A-Twin
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1 Getting Started
This document provides the basic information
needed to quickly install and configure the
AHA®-2740A Series of EISA-to-Fast SCSI Host
Adapters.
The host adapters in the series are differentiated by
the presence of an additional SCSI channel (SCSI
Channel B) on the two TwinChannel models:
AHA-2740A-Twin and AHA-2742A-Twin. Furthermore, the AHA-2742A and AHA-2742A-Twin
include an onboard floppy controller and connector.
Jointly, the AHA-2740A and AHA-2742A are
referred to in this document as the AHA-2740A/
2742A; the AHA-2740A-Twin and AHA-2742A-Twin
are referred to as the AHA-2740A/2742A-Twin.
Cumulatively, all four host adapters are referred to
in this document as the AHA-2740A Series.
2 Board Layout
The following figure shows the location of the major
components on the host adapter; the table that follows provides a description of each component.
J1 U1
U2 J4
J3
U5
PIN 1
PIN 1
PIN 1
J2
J5
U9
U10
J6
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Location
Description
J1
External LED Connector
J2
Floppy Connector (AHA-2742A and AHA-2742A-Twin only)
J3
SCSI Channel A Internal Connector
J4
Floppy Enable Jumper
(AHA-2742A and AHA-2742A-Twin only)
J5
SCSI Channel B Internal Connector
(AHA-2740A/2742A-Twin only)
J6
SCSI Channel A External Connector
U1
Floppy Controller (AHA-2742A and AHA-2742A-Twin only)
U2
RAM
U5
Host Adapter BIOS
U9
AIC-7770 Bus Master SCSI Chip
U10
AIC-701 Configuration Chip
3 Default Settings
Your host adapter is already configured for the
majority of EISA class computers. The following
table lists the default settings for SCSI Channel A of
your host adapter. If your host adapter is an
AHA-2740A/2742A-Twin, the default settings for
SCSI Channel B are the same as SCSI Channel A.
Refer to Section 6, Configuring the Host Adapter, for
information on changing any of these settings.
Description
Default Setting
Interrupt Level
IRQ 11 Level
Bus Release Time
44 BCLKS
Data FIFO Threshold
100%
Host Adapter BIOS Base Address
D8000h
Host Adapter SCSI ID
Device ID 7
SCSI Bus Parity
Enabled
SCSI Selection Timeout
256 ms
SCSI Bus Reset at Power-on
Enabled
SCSI Bus Termination
Enabled
Primary Channel Selection
(AHA-2740A/2742A-Twin only)
Channel A
Greater Than 1 GByte Support
Enabled
More Than Two Drives Support
Enabled
Removable Drive Support
Support removable drive as
boot device only
Bootable CD-ROM Support
Enabled
Int 13h Extensions Support
Enabled
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The Onboard Floppy Controller
(AHA-2742A and AHA-2742A-Twin only)
■
If your floppy diskette drives are already running
under another controller, disable the onboard
floppy controller by removing the jumper shunt
on jumper J4.
■
To use the onboard floppy controller, leave the
jumper shunt installed on jumper J4 and then disable your existing floppy controller; refer to your
computer or floppy controller documentation.
4 Installing the Host Adapter
Board Installation
Caution: Turn OFF and disconnect power to
the computer and external equipment.
Always refer to your computer's documentation for instructions on removing the computer cover and adding option boards.
1 Remove the cover of your EISA computer to
expose the EISA bus slots on the motherboard.
2 Locate an unused EISA slot that supports
bus master operations (refer to the EISA computer
documentation for details) and remove the corresponding slot cover.
3 Align and insert the host adapter in the EISA slot.
Secure the host adapter in your computer.
5 Connecting Peripherals
Connecting Cables
SCSI devices are cabled together in a single
continuous daisy chain of devices, called the SCSI bus.
SCSI Channel A and SCSI Channel B (AHA-2740A/
2742A-Twin only) can each accommodate a SCSI bus
with up to seven SCSI devices connected. SCSI
Channel A has both an internal and external connector. SCSI Channel B has an internal connector only.
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Note: Only single-ended (non-differential) SCSI
devices are supported by the AHA-2740A
Series. Consult your SCSI device user documentation.
Internal SCSI Cables
The internal connectors for SCSI Channel A and SCSI
Channel B (AHA-2740A/2742A-Twin only) use a
50-pin SCSI flat ribbon cable with a 50-pin header
internal connector.
Note: When connecting the 50-pin internal
SCSI ribbon cable to both the host adapter
and internal SCSI device(s), be sure to maintain pin-1 orientation throughout the bus.
Pin 1 of the SCSI cable is designated by a colored stripe on one edge of the flat ribbon
cable. Pin 1 of the host adapter or SCSI
device connector is usually marked with a
delta or arrow symbol (▲) on the connector.
External SCSI Cables
The external connector for SCSI Channel A uses a
50-pin shielded cable with a high-density external
connector. External cable connectors are keyed and
can only be plugged in one way; pin-1 orientation is
automatic.
Floppy Cables (AHA-2742A and AHA-2742A-Twin only)
The floppy connector uses a 34-pin floppy ribbon
cable with a 34-pin header connector. Be sure to
maintain pin-1 orientation as previously described in
Internal SCSI Cables.
Termination on the SCSI Bus
The first and last physical SCSI devices on the ends
of the SCSI bus must have a set of resistors called
terminators either installed or enabled. All other SCSI
devices installed between the ends of the SCSI bus
must have their terminators either removed or
disabled.
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Terminating the Host Adapter
The factory installed bus terminators on the host
adapter are enabled by default. Host adapter
termination should be disabled if you attach SCSI
devices to both internal and external connectors,
since the host adapter would then be in the middle of
the SCSI bus. The following table describes the three
possible SCSI device and host adapter (AHA)
configurations.
Devices Connected To Host Adapter
AHA Termination
Internal devices only (AHA at end of cable)
On/Enabled
External devices only (AHA at end of cable)
On/Enabled
Internal and External devices (AHA in between)
Off/Disabled
Host adapter termination settings are software
selectable only. To disable termination on the host
adapter, refer to Section 6, Configuring the Host
Adapter.
Note: Any unused SCSI Channel (A or B)
must have its termination enabled. If your
host adapter is an AHA-2740A/2742A-Twin,
host adapter termination for SCSI Channel B
should normally be enabled.
Terminating Other SCSI Devices
Check the manufacturer's documentation to
determine how to enable or disable SCSI bus
termination on your SCSI device(s).
SCSI ID Setting
Each device on the SCSI bus must have a unique
SCSI ID (0-7). Your host adapter has a default SCSI
ID of 7. You only need to change SCSI IDs if there is a
conflict. Refer to the 2740A Series User’s Guide for
more detailed information on setting SCSI IDs.
6 Configuring the Host Adapter
The EISA computer vendor normally supplies a
bootable configuration diskette containing an EISA
Configuration Utility (ECU). Depending on the ECU
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supplied with your computer, host adapter configuration will vary. This section describes the basic
steps involved in running the ECU.
Running the ECU
Place the configuration diskette in your floppy boot
drive and reset the computer to boot from this diskette. Run the ECU as instructed by your EISA
computer vendor.
Copying Files
The ECU typically allows you to select among a
number of options, including copying new configuration files. Select this option to install the
!adp7771.cfg and adp7770.ovl files from the host
adapter diskette to the bootable configuration diskette. If the ECU does not provide such an option,
you can use the DOS Copy command to copy these
files to the bootable configuration diskette.
Selecting the Host Adapter
Once the files have been copied, run the option in the
ECU that allows you to configure the EISA slot in
which the host adapter is installed. Running this
option will set up the default settings for the host
adapter parameters.
Configuring the Host Adapter Parameters
This option allows you to change the host adapter
parameter settings.
■
Interrupt Level– Defines the interrupt channel
(IRQ) used by the host adapter. The default is IRQ
11 LEVEL. You may want to select a different IRQ
for each host adapter to increase system
performance.
■
Bus Release Time– Defines the length of time the
host adapter will continue to transfer data after
being pre-empted in Bus Master mode. The
default is 44 BLCKS (bus clocks). If multiple bus
master cards are installed in the system, you may
want to lower the value to free the EISA bus
sooner.
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■
Data FIFO Threshold– Defines the percentage
used by the host adapter to manage its internal
data FIFO. The default is 100%.
■
Host Adapter BIOS Base Address– Defines the
base BIOS address, or disables the host adapter
BIOS. The default is D8000h. When choosing the
base address, verify that there is no conflict with
other devices using the same address.
Note: The BIOS must be enabled if you want
the computer to boot from a SCSI hard drive
attached to the host adapter.
■
Host Adapter SCSI ID– Defines the SCSI ID for
the host adapter. The default SCSI ID is 7, which
is the recommended setting. Each installed SCSI
device must have a unique SCSI ID.
Note: If any SCSI device is connected to the
50-pin internal SCSI connector, the host
adapter SCSI ID must be assigned a value
that ranges from 0 to 7.
■
SCSI Bus Parity Check– Enables or disables SCSI
bus parity checking on the host adapter. The
default is Enabled. Disable SCSI Bus Parity Check
if any attached SCSI devices do no support parity
checking.
■
SCSI Selection Timeout– Sets the time, in milliseconds, used by the host adapter during the
SCSI Selection phase. Lowering the SCSI Selection Timeout will speed up SCSI bus scans considerably; however, before lowering this value,
make sure that all the devices on the SCSI bus can
respond to the shorter selection time. The default
is 256 milliseconds.
■
SCSI Bus Reset at Power-on– Enables or disables
a SCSI bus reset generated by the host adapter
during its power-on initialization, and after a
Hard Reset. The default is Enabled.
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■
SCSI Bus Termination–Enables or disables SCSI
termination on the SCSI bus. The default is
Enabled. Disable this parameter only if you attach
SCSI devices to both internal and external
connectors.
■
Primary Channel Selection (AHA-2740A/2742ATwin only)– Allows you to select which SCSI
channel (A or B) the host adapter boots from.
BIOS Configuration
This option allows you to change the configuration
of the host adapter BIOS.
■
Extended Translation for Drives >1GByte– Provides a mechanism under DOS for using a hard
disk with a capacity greater than 1 GByte. Other
operating systems do not need this mechanism.
The following translation schemes are used:
– Hard disks ≤ 1 GByte use a translation scheme
of 64 heads, 32 sectors per track.
– Hard disks ≥ 1 GByte use a translation scheme
of 255 heads, 63 sectors per track.
■
Support for More Than Two Drives– Allows
BIOS to recognize and control more than two
SCSI hard disks without installing additional software drivers (supported by DOS 5.0 and above).
If this option is enabled, up to eight hard disks
can be attached to Int 13h.
■
Support Removable Disks as Fixed Disk–
Allows you to use removable media disk drives
without installing additional software drivers.
The options are
– Disable removable drive support
– Support removable drive as boot device only
– Support all removable drives
Note: Support for removable drives means
the BIOS treats a removable drive as if it were
a fixed disk drive; it does not mean that the
disk media can be removed during operation.
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Support for Bootable CD-ROM– allows you to
boot up from a bootable CD-ROM.
■
Support for Int 13h Extensions– provides a
mechanism to support disks with more than 1024
cylinders, and to add support for software control
of drive locking for removable media.
SCSI Device Configuration
This option allows you to change certain parameters
for each SCSI device connected to the host adapter.
Select values for each setting as instructed on the
screen's menu.
■
Error if Device Not Found– selects whether the
operator will be notified if the BIOS is unable to
find the device during the boot procedure.
■
Include in BIOS Scan– allows hard disks and
removable media drives attached to the SCSI bus
to be recognized by the host adapter BIOS and
installed as devices on the computer without the
need for device driver software.
■
Send Start Unit Command– is used for devices
that require a command to start up after power
on. Most devices do not require this.
■
Initiate Synch Negotiation– allows the host
adapter to attempt to use the faster synchronous
protocol for data transfers on the SCSI bus. If deselected, the transfer will be done asynchronously, unless a SCSI device itself requests synchronous negotiation.
■
Enable Disconnection– allows the host adapter
and SCSI device to disconnect from the SCSI bus.
When the SCSI device is ready to transfer data,
then it can initiate a reconnect to the host adapter.
■
Maximum Sync Xfer Rate– allows selection of
the highest data transfer speed that the host
adapter will attempt with that device. The host
adapter supports rates up to the Fast SCSI maximum of 10 MBytes/sec.
When configuration of the SCSI devices is complete,
save the configuration and exit the ECU.
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Utilities
The following SCSI utility is available with your host
adapter:
■
Format Disk– accesses the Adaptec SCSI LowLevel Format utility. Most SCSI disk drives are
preformatted, and do not need reformatting.
Select Utilities from the ECU to access Format Disk.
7 Operating System Support
DOS/Windows
Under MS-DOS 5.0 or higher, up to eight SCSI hard
disk drives can be connected to the host adapter
without additional software. (Older versions of DOS
support up to two hard disk drives.) Additional software is required to do the following:
■
Support more than two hard disk drives, under
versions of DOS prior to MS-DOS 5.0.
■
Use devices other than hard disk drives such as
SCSI tape, CD-ROM, scanners, etc.
■
Treat removable media devices as removable
while your computer is running.
Adaptec EZ-SCSI
Adaptec EZ-SCSI for DOS/Windows,
Windows 95, and Windows NT™ is included in this
package. Use the menu-driven software to install
drivers and configure your DOS/Windows operating system automatically.
Other Operating Environments
AHA-2740A Series host adapters support the Novell
NetWare, OS/2, SCO, Novell Unixware operating
systems. The Adaptec 7700 Family Manager Set is
included in this package to enable you to install the
appropriate driver for your system. Refer to the
Adaptec 7700 Family Manager Set User’s Guide (also
included) for detailed information.
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8 Troubleshooting
Computer Will Not Boot From a SCSI Disk Drive
If both SCSI and non-SCSI disk drives (e.g., IDE
drives) are installed, then the non-SCSI disk drive is
always the boot device. If there is no non-SCSI disk
drive
1 Make sure your computer's CMOS Setup is set to
No Drives Installed, as is required for SCSI host
adapters.
2 Try enabling the BIOS Support Option as
described in SCSI Device Configuration on page 9.
3 Make sure the SCSI hard disk drive SCSI ID is set
to 0. The drive SCSI ID is normally set with jumpers or switches on the drive. Each SCSI device
should be set to a unique SCSI ID.
4 Make sure the SCSI bus termination is set correctly. The ends of the SCSI bus must be
terminated.
5 A low-level format of the SCSI hard disk may be
necessary. Back up the data first, then run the
Format utility accessible through the ECU.
Multiple Host Adapters
Make sure that each host adapter is set to a separate
BIOS address. Or, disable the BIOS on all but one of the
host adapters.
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9 Adaptec Customer Support Services
If you have questions about installing or using your Adaptec
product, check this document first—you will find answers to most
of your questions here. If you need further assistance, please contact us. We offer the following support and information services:
■
For technical support, for information about the Adaptec Electronic Bulletin Board Service (BBS) and the File Transfer Protocol (FTP) and World Wide Web (WWW) Servers, and for access
to the Interactive Fax system, call 800-959-SCSI (7274) or
408-945-2550, 24 hours a day, 7 days a week. To speak with a
product support representative, call 408-934-SCSI (7274), Monday through Friday, 6:00 A.M. to 5:00 P .M., Pacific Time; after
these hours, on weekends, and on holidays, product support is
also available for a fee at 800-416-8066.
–
The Adaptec BBS provides answers to commonly asked
questions and information on software upgrades and other
topics. The BBS is available 24 hours a day, 7 days a week, at
408-945-7727; 1200/2400/9600/14,400/28,800 baud, 8 data
bits, 1 stop bit, no parity.
–
The Adaptec FTP and WWW Servers provide product literature, answers to commonly asked questions, and information on software upgrades and other topics. The FTP and
WWW Servers are available from the Internet 24 hours a
day, 7 days a week, at ftp.adaptec.com and
http://www.adaptec.com.
–
The Adaptec Interactive Fax system provides product literature, answers to commonly asked questions, and current
information about Adaptec products and services. The
Adaptec Interactive Fax system is available 23 hours a day,
7 days a week. The Fax system is out of service 1 hour each
day. You can call this service directly at 408-957-7150.
■
For sales information, call 800-959-SCSI (7274) or 408-945-2550,
Monday through Friday, 6:00 A.M. to 5:00 P.M., Pacific Time.
■
To order Adaptec software and cables, call 800-442-SCSI (7274)
or 408-957-SCSI (7274), Monday through Friday, 6:00 A.M. to
5:00 P.M., Pacific Time.
■
To request additional documentation for Adaptec products,
call 800-934-2766 or 510-732-3829, Monday through Friday,
6:00 A.M . to 5:00 P.M., Pacific Time.
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FCC Compliance Statement
NOTE: This equipment has been tested and found to comply with the limits
for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in residential installations. This equipment generates, uses, and can
radiate radio frequency energy, and if not installed and used in accordance
with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a
particular installation.
If this equipment does cause interference to radio or television equipment
reception, which can be determined by turning the equipment off and on,
the user is encouraged to try to correct the interference by one or more of the
following measures:
•
•
•
•
Reorient or relocate the receiving antenna
Move the equipment away from the receiver
Plug the equipment into an outlet on a circuit different from that to
which the receiver is powered
If necessary, the user should consult the dealer or an experienced radio/
television technician for additional suggestions
CAUTION: Only equipment certified to comply with Class B (computer
input/output devices, terminals, printers, etc.) should be attached to this
equipment, and must have shielded interface cables.
Finally, any changes or modifications to the equipment by the user not
expressly approved by the grantee or manufacturer could void the user ’s
authority to operate such equipment.
Each host adapter is equipped with an FCC compliance label that shows
only the FCC identification number. The full text of the associated label
follows:
This device complies with part 15 of the FCC rules. Operation is subject to
the following two conditions: (1) this device may not cause harmful interference and (2) this device must accept any interference received, including
interference that may cause undesired operation.
Adaptec, Inc.
691 South Milpitas Blvd.
Milpitas, CA 95035
Copyright  1993, 1994, 1995,1996, Adaptec, Inc. All rights
reserved. Adaptec, the Adaptec logo, AHA, AIC, EZ-SCSI and
TwinChannel are trademarks of Adaptec, Inc. which may be registered in some jurisdictions. Windows NT is a trademark, and
Windows and Windows 95 are registered trademarks of Microsoft
Corporation in the U.S. and other countries used under license.
All other trademarks are owned by their respective owners.
Printed in Singapore
Stock No.: 511053-00, Rev. A JW 1/96
Information subject to change without notice.
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AHA-2740A Series Installation Guide
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Part
Number:
511053-00,
Rev.
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Print
Spec
Number:
494619-00
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Current
Date:
2/7/96
ECN
Date:
1/30/96
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