AHA154X.ADD

Adapter Device Driver for Adaptec AHA-1540/1542 SCSI host bus adapters and AHA-1740/1742/1744 adapters (in standard mode).

BASEDEV=AHA154X.ADD <parameter>

Supported devices:

AT Bus Master
- AHA-1540 AT-to-SCSI Host Adapter
- AHA-1540A, AHA-1542A
- AHA-1540B, AHA-1542B
- AHA-1540C, AHA-1542C - ISA
- AHA-1540CF, AHA-1542CF - ISA-to-SCSI Host Adapter
- AHA-1540CP, AHA-1542CP - ISA-to-SCSI Plug and Play
EISA in standard mode
- AHA-1740 - EISA-to-Fast SCSI Host Adapter
- AHA-1740A, AHA-1742A - EISA-to-Fast SCSI Host Adapter
- AHA-1744 (differential)

Parameters

/V : Load driver verbosely. This parameter will display the driver name as well as the version number and Adaptec copyright if the driver loads successfully.
/DBUFF : Loose access to RAM above 16M.
/A:0
/BOFF:t - allows the bus-off time to be set to a value between 1 and 64 microseconds. The default value for OS/2 2.x is 4 microseconds and this should be used for most systems.
/BON:t - allows the bus-on time to be set to a value between 2 and 15 microseconds. The default value for OS/2 2.x is 7 microseconds and this should be used for most systems.
/D - Allow targets to disconnect from the SCSI bus (DEFAULT).
/!D - Prevent targets from disconnecting from the SCSI bus. This command is not supported on boards earlier than revision B.
/UR - Report underruns.
/!UR - Ignore underruns (DEFAULT).

TIP: By Prof. C.W. Fischer (Physics Department Director, CPES Micro-Computer Lab). Users may be interested in a undocumented parameter on the Adaptec AHA154x.add file i.e /DBUFF. Anyone using this SCSI adapter without /DBUFF will lose access to RAM above 16M. It's a bus mastering problem on ISA (thanks to Steven Levine).
NOTE: When you use Seagate Backup Exec for OS/2 Warp, Version 3.0 with both a hard drive and an SCSI or QIC backup device connected you have to add - to avoid DMA errors - the following to your driver line to prevent BUS errors: /V /A:0 /BON /A:0 /BOFF:8