Board Features - Adaptec AHA-1740A Technical Reference Manual

EISA-to-Fast SCSI Host Adapter
Internal and external SCSI connectors
Initiator and target modes of operation fully supported
Differential SCSI (AHA-1744 only)
SCSI-1 and SCSI-2 compatible
Tagged queuing

Board Features

In addition to extensive functions on the two main interfaces of the board, the intelli-
gence built into the board microcode and BIOS software allows a number of addi-
tional functions to be offered, including:
Scatter/Gather operation
Boot from any target (set as configuration option)
Compatible with existing AHA-1540 family driver software (ASW-1400 series
managers)
True multithreaded operation supporting up to 255 tasks simultaneously
Programmable mailbox architecture
Bootable BIOS for standard hard disk emulation
Floppy Diskette Controller (AHA-1742A only)
While all versions of the board fully support all of the above features, they are distin-
guished by:
AHA-1740A Fast SCSI-to-EISA Host Adapter
AHA-1742A Fast SCSI-to-EISA Host Adapter with floppy diskette controller
AHA-1744
The AHA-1740A/1742A/1744 microcode is available in two separate versions which co-
exist simultaneously in the onboard PROM, but must be configured into one of the
two available modes:
Standard Mode
Enhanced Mode
The modes cannot operate simultaneously. The EISA Configuration Utility (ECU)
must be run to select one of the modes (Refer to Chapter Three, Installation). The
Fast differential SCSI-to-EISA Host Adapter
Introduction
1-3