PM9500 Scsi type?

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Joined: Dec 29 2006
Posts: 59

Do you know if this is just normal scsi (80-pin?) or what type it is?

Thanks,

Chris P.

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eeun's picture
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Joined: Dec 19 2003
Posts: 1891
What do you mean...the intern

What do you mean...the internal scsi bus?
If so, it's the same scsi of all Macs of that era, which is 50-pin, not 80.

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dankephoto's picture
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Joined: Dec 20 2003
Posts: 1900
narrow and fast

The internal-only bus is narrow and fast (50pin and 10MB/s) and the external/internal bus is narrow and not fast (50pin and 5MB/s.)

As a general rule, you should only use one wide 68/80pin device on a 50pin bus and it must be the last device and _must_ be terminated across the full wideness of itself (not just the 50 pin part.) An 68/80 pin device of course requires an adapter. An 80pin-50pin adapter must have termination built-in. A 68pin device could use built-in termination (on the drive), or could use an external term on the 68pin cable (at the end of course), or the 68-50pin adapter could include termination.

heh, hth, Laughing out loud

dan k

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Joined: Dec 29 2006
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sorry about being such a newb

sorry about being such a newb, lol. I didn't start really working on macs until the beige g3 era forward (as someone who fixes them). I guess I'll have to get used to the scsi way of thinking. the only scsi based devices i've used are external and provide their own power for termination. would this be okay for adapting current scsi drives over? http://cgi.ebay.com/NEW-SCA-adapter-80-pin-to-SCSI-I-II-III-68-50_W0QQitemZ370041632102QQihZ024QQcategoryZ31494QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

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Macintosh User Since '92
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I'm currently looking for a PM9600 that's in good shape. thanks!

dankephoto's picture
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Joined: Dec 20 2003
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re: adapter

The adapter you reference doesn't include built-in termination, but it ought to work if you add a terminator to the 68pin connector.

The 80/68 to 50 adaptation thing can be a real hair-puller, just expect to do some fiddling if (when?) it doesn't work immediately. SCSI has traditionally seemed more of an art than a science, though following the rules and using high-quality components usually has things working sooner than later.

dan k

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Joined: Dec 29 2006
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haha, I look forward to becom

haha, I look forward to becoming an PPC mac guru sooner or later. Guess this is a good first step Wink

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Macintosh User Since '92
Resident Tuba Player
I'm currently looking for a PM9600 that's in good shape. thanks!