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From: KVC@ENGVAX.UUCP (Kevin Carosso)
Newsgroups: mod.computers.vax
Subject: Two UNIBUSes on an 8600
Message-ID: <8602251918.AA09712@csvax.caltech.edu>
Date: Tue, 25-Feb-86 14:14:56 EST
Article-I.D.: csvax.8602251918.AA09712
Posted: Tue Feb 25 14:14:56 1986
Date-Received: Fri, 28-Feb-86 02:46:23 EST
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I'm going to be moving a UNIBUS from a 785 onto an 8600, and was wondering
if someone out there might decipher what the VAX Systems and Options Summary
[VSOS] (July to December, '85) is trying to tell me.

I have a non-cluster 8600 with the standard one UNIBUS.  According to the
VSOS I have a DW780-MA in the 8600 already plus space for a DW780-MB.  Now,
what is the difference between a -MA and a -MB?  In my system, it looks
like there is an IDTC (Integrated Disk and Tape Controller) stuck into the
slot that the VSOS says can take a DW780-MB.  Since we don't use the IDTC,
I just wanna pull it out and put the 2nd UNIBUS adapter there (I have an
expansion cabinet with MASSBUS adapters for disks and tapes).  The UNIBUS
adapter is coming from a 785.  Does that mean it's a -MA? or a -MB? or
something else entirely?  does it even matter?  Why is the VSOS such a pain
in the ass...?

I assume I could always put the UNIBUS adapter into my expansion cabinet,
but I want to save slots and use the CPU slot if at all possible.  Besides,
the exp cab is full of non-DEC power supplies, and someone might have a
tizzy if I tried to tell them to plug that there DW780 into that there
"tainted" power supply... :-)

Thanks,

	/Kevin Carosso               engvax!kvc @ csvax.caltech.edu
	 Hughes Aircraft Co.