Re: SCSI woes, again.

[spector@vax2.concordia.ca (Mitchell Spector)]

In article gachenb@eis.calstate.edu (Greg R. Achenbach) writes...
>
>This is the situation.  I'm trying to get a GS system put together for my 
>Grandfather.  I got a 40meg HD and a SCSI card and am having trouble 
>getting things to work.
> 
>Question #1 - How do you tell the difference between the different
>versions of the Apple II SCSI card (not HS).  I know I need rev.C for it 
>to work with GS/OS (at least I think I heard that somewhere) but don't 
>know how to tell the difference.  The big chip at the top of the card 
>that looks suspiciously like the ROM chip has a white sticker on it that 
>says "341-0437-A    Apple '87".

	Usually, somewhere on the old non-DMA Apple SCSI cards, is a marking
indicating what hardware revision it is (rev A, B or C). I can't remember
exactly where this marking is located, having only owned a Rev 'A' for less
than a week, but it is there somewhere -- look carefully. As far as using the
old Apple SCSI cards with GS/OS, you _can_ use a revision 'A' or 'B' just fine,
so long as the ROM is upgraded to '341-0437-A' (which you already have). I had
System 6.0.1 running from an Apple 20SC HD, connected up to a Rev 'A' Apple
SCSI card. If your using an Apple 40SC, you may need to use the GS/OS SCSI 
drivers from System 5.0.4. For some odd reason, System 6.0/6.0.1's SCSI 
drivers will _not_ work with the Apple 20SC HD! Had to make a backup of 
the Installer disk and swap the System 6 drivers with the old System 5.0.4 
SCSI drivers. This worked just fine, aside from the fact a non-DMA SCSI card
and 89ms hardrive is almost as slow as a 3.5 floppy drive! ;-) 

>Question #2 - There is a row of pins with a jumper block that I suspect 
>is for setting the SCSI ID of the computer/card.  The jumper is currently 
>on the pins closest to the center of the card.  Is this the correct 
>position for making the card ID #7?

	Not sure about this one. Doesn't the computer always have the
highest SCSI priority by default -- SCSI ID #7?

>Question #3 - How do I determine if the drive is terminated and/or 
>supplying termination power?  I tried it without an external terminator 
>and with one.  Neither option worked.  If neither the card nor the drive 
>are supplying term power, how do I get that power?  Is that what an 
>"active terminator" does?

	I don't think the old SCSI cards supplied termination, as it was,
I had an external terminator connector attached to the back of the hardrive.
The 50-pin SCSI cable then plugged into the back of it...

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>Greg Achenbach             gachenb@eis.calstate.edu (soon to be ctp.org)
>Los Angeles County Outdoor Science School

Mitchell Spector
sb_spec@pavo.concordia.ca / spector@vax2.concordia.ca