Re: SCSI Card

[salfter@salfter.dyndns.org (Scott Alfter)]

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In article <1ferves.o2k56i1ilmsdcN%dempson@actrix.gen.nz>,
David Empson <dempson@actrix.gen.nz> wrote:
>The original Apple SCSI card doesn't know about removable hard drives,
>so if you swap cartridges in a Zip or SyQuest and don't reboot, it will
>continue to use the partition map from the original cartridge,
>potentially destroying the contents of the new cartridge.  It didn't
>support CD-ROM drives until the revision C firmware.

I think the non-DMA Apple SCSI card I obtained recently is more than likely
a rev. C card, but is there a way to tell for sure?  The FAQ says to check
for particular Apple part numbers on the firmware EPROM, but mine has a
plain white label on top (maybe it was upgraded from something older, or
maybe the original label fell off and the plain label was stuck on to
protect the EPROM's contents...one of the PALs is missing its label, so the
latter is possible).

Since some (all?) of the ROM gets mapped into the computer's address space,
can the different versions be detected in software?  Were there some
signature bytes that can be checked?

(I'm just curious...the card will end up in my II+ with just a hard drive
hanging off of it most of the time.  Sharing my Zip drive between my three
Apple IIs and my Mac could be useful for moving large amounts of data back
and forth, though.)

  _/_
 / v \  Scott Alfter (salfter@salfter.dyndns.org)
(IIGS(  http://salfter.dyndns.org
 \_^_/  rm -rf /bin/laden

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