Table 1-1. Host Adapter Components
Location
Description
J1
External LED Connector
J2
Floppy Connector (AHA-2742/2742T only)
J3
SCSI Channel A Internal Connector
J4
Floppy Enable Jumper (AHA-2742/2742T only)
J5
SCSI Channel B Internal Connector
(AHA-2740T/2742T only)
J6
SCSI Channel A External Connector
U1
Floppy Controller (AHA-2742/2742T only)
U2
RAM
U5
Host Adapter BIOS
U9
AIC-7770 Bus Master SCSI Chip
U10
AIC-701 Configuration Chip
Default Settings
Your host adapter is already configured for the majority of EISA
class computers. Table 1-2 lists the default settings of your host
adapter. Refer to Chapter 3, Configuring the Host Adapter for
information on changing any of the settings.
Table 1-2. Host Adapter Default Settings
Description
Default Setting
Interrupt Level
IRQ 11, Level
Sensitive
Bus Release Time
60 BCLKS
Data FIFO Threshold
100%
Host Adapter BIOS Base Address
D8000h
Host Adapter SCSI ID
Device ID 7
SCSI Bus Parity Check
Enabled
SCSI Selection Timeout
256 milliseconds
SCSI Bus Reset at Power-on
Enabled
SCSI Bus Termination
Enabled
Extended Translation for Drives > 1 GByte
Enabled
Support More Than Two Drives
Disabled
Support Removable Disks as Fixed Disks
Boot Device Only
Adaptec AHA-2740 Series User’s Manual
Stock Number: 510381-00 / Rev. C (Page 1-7)
Print Spec Number: 491709-00 Rev C
Current Date: 9/1/93 ECN Date: 9/14/93
Introduction
1-7
