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Re: How to add TERMPWR to SCSI bus via HD case
- Subject: Re: How to add TERMPWR to SCSI bus via HD case
- From: peterm@tlp.apana.org.au (Peter Maloney)
- Date: Tue, 22 Nov 94 18:11:17 AEST
- Newsgroups: comp.sys.apple2
- Organization: The Lower Planes BBS +61-3-543-2585
- References: <39v5me$9o4@eis.calstate.edu>
1. Which pin of the DB-25 SCSI connector is the one that
supplies termination power to the bus?
It's pin 25. On the big connector (50-pin) it's pin 38.
2. What voltage line from the PS goes to it? It seem to me that
I remember it being the +5v. Right?
+5 Volts or so...
3. Should I put a fuse or diode or some other electronic gizmo
in between, or is just running a wire sufficient?
Both diode and fuse unless you're a thrill-seeker.
4. What else do I need to know? I'm not an electronics whiz,
but I know which end of a soldering iron not to touch. (I didn't even
need to learn it the hard way :)
Just make sure that you have the right terminators in place. Some
modern(!) drives have the new SCSI-2 terminators and they won't play with
some older drives/cards unless you change them back to SCSI-1.
*<8o)X
Regds,
Peter M.
peterm@tlp.apana.org.au TLP - The only *REAL* A2 BBS in
Peter Maloney Melbourne
A2 Hardware Freak
This should not be construed as a disclaimer.