Re: WTB SCSI HD

[Steve Jensen <sjensen@primenetyourknife.com>]

Nathan Mates <nathan@visi.com> wrote:
: In article <01bc97ba$984e22a0$c97192cf@system1>,
: Dan Yertzell <Dan-Yertzell@worldnet.att.net> wrote:
: >BTW, my apple SCSI card looks to be a REV A (#607-0291-A, c 1986).  The ROM
: >says "341-0437-A".  But I know it was used in this //GS by the previous
: >owner, in fact the box and manual state "For the II+, //e and IIGS".  So
: >what's the deal?  Everyone seems to be saying a REV C is needed to work in
: >a IIGS?

:    Let's just say that the Rev A ROMs had a few bugs. "Oops, we
: accidentally remapped a few commands to the SCSI 'format disk'
: option."  You want to use a Rev A, make lots of backups.

: Nathan Mates

Dan, no sweat.  You already have a rev C Rom.
 
The original Apple SCSI card went through three ROM revisions, called
"revision A", "revision B" and "revision C".  The ROM part numbers are:
 
rev A: 341-0112A
rev B: 341-0112B
rev C: 341-0437A
 
The first two versions are 2764 EPROMs (8Kx8).  The rev C is a 27128
EPROM (16Kx8).
 
Revision C is required for use with GS/OS, or to support Apple CD-ROM
drives.  Revs A & B will work on a GS using ProDOS 8 just fine.  I
ran GBBS on a rev A for years.
 
Nathan-  Where can I find more detailed info on the rev A bugs?
 
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