🚀 go-pugleaf

scjones@thor.sdrc.com (Larry Jones) writes:

>That's not quite true -- they're upward compatible, but not downward
>(the 1542B supports scatter/gather I/O, the 1542A doesn't).  As long
>as you just use the on-board BIOS the cards are interchangable, but
>if you plan to use an external driver (like for Unix or OS/2) be sure
>it supports the 1542A.

According to the compatability chart in the Adaptec 1542A tech ref manual,
the 1540A and 1542A DO support scatter gather, but the 1540 does not.


COMPATIBILITY CHART

Function                  1540      W1542A      1542A      1540A      1640
Floppy Disk Controller      No        Yes        Yes         No         No
Synchronous Transfer        No        Yes        Yes        Yes        Yes
Selectable DMA Speeds       No        Yes        Yes        Yes        POS
Programmable DMA Speeds    Yes        Yes        Yes        Yes        Yes
Internal SCSI Connectors Straight    Rt Angle   Rt Angle   Rt Angle   Straight
Scatter Gather              No        Yes        Yes        Yes        Yes
64 Head BIOS              Option      Yes        Yes        Yes        Yes
16 Head BIOS               Yes         No         No         No         No
LED Connector               No        Yes        Yes        Yes        Yes
Target Mode                 No         No        Yes        Yes        Yes
LA 17-19 Jumper            Yes        Yes         No         No         NA
Micro Channel               No         No         No         No        Yes
PC/AT                      Yes        Yes        Yes        Yes         No


Charles