1 Getting Started
This guide provides the basic steps required for
installation of the AHA
®
-2740/2742 and the
AHA-2740-T/2742-T EISA-to-Fast SCSI Host
Adapters. Procedures for all adapters are the same
except when regarding the on-board floppy control-
ler on the AHA-2742/2742-T. Installation of the
host adapter includes:
1. Installing the AHA (Adaptec Host Adapter) board
in an EISA system.
2. Installing the SCSI cable(s) and SCSI peripheral
devices.
3. Terminating the SCSI bus.
4. Adjusting the host adapter configuration settings
if necessary.
5. Loading software if necessary.
2 Board Layout
Figure 1 shows the location of the major compo-
nents on the host adapter; Table 1 provides a
description of each component.
Table 1. Host Adapter Components
Location Description
J1 External LED Connector
J2 Floppy Connector (AHA-2742/2742-T only)
J3 SCSI Channel A Internal Connector
J4 Floppy Enable Jumper
(AHA-2742/2742-T only)
J5 SCSI Channel B Internal Connector
(AHA-2740-T/2742-T only)
J6 SCSI Channel A External Connector
U1 Floppy Controller (AHA-2742/2742-T 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. Table 2 lists the
default settings of your host adapter. Refer to
Section , Configuring the Host Adapter for
information on changing any of these settings:
Table 2. Host Adapter Default Settings
Description Default Setting
Interrupt Level IRQ 11
Bus Release Time 60 BCLKS
Data FIFO Threshold 100%
Host Adapter BIOS 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
Greater Than 1 GByte Support Disabled
More Than Two Drive Support Disabled
Removable Drive Support Support removable
drive as boot device
only
The On-board Floppy Controller
(AHA-2742/2742-T only)
•
If your floppy diskette drives are already run-
ning under another controller, disable the
on-board floppy controller by removing the
jumper shunt on jumper J4.
•
To use the on-board floppy controller, leave the
jumper shunt installed on jumper J4 and then
disable your existing floppy controller; refer to
your computer or floppy controller user
documentation.
4 Installing the Host Adapter
Board Installation
CAUTION
Turn OFF and disconnect power to the system and
external equipment. Always refer to your system’s
documentation for instructions on removing the
system cover and adding option boards.
1. Remove the cover of your EISA personal
computer to expose the EISA bus slots on the
motherboard.
2. Locate an unused EISA slot in your system which
supports bus master operations (refer to the
host system 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 system.
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-2740-T/2742-T only) can each accommodate
a SCSI bus with up to seven SCSI devices con-
nected. SCSI Channel A is comprised of both an
internal and external connector.
Note
Only Single-Ended SCSI devices are supported by the
AHA-2740/2742/2740-T/2742-T host adapters. Consult
your SCSI device user documentation.
Internal SCSI Cables
When connecting the 50-pin internal SCSI ribbon
cables to both the host adapter and internal SCSI
peripheral device(s), make sure that Pin 1
6
123
J2J1 J4 J3U2U1 U5
U10U9 J6J5
PIN 1
PIN 1
PIN 1
Figure 1. Host Adapter Board Layout
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