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From: terry@spcvxb.spc.edu (Terry Kennedy, Operations Mgr)
Newsgroups: comp.sys.dec
Subject: Re: How to tell the differece between Unibuss and Qbuss?
Message-ID: <1990Dec23.062936.918@spcvxb.spc.edu>
Date: 23 Dec 90 06:29:36 GMT
References: <37169@cup.portal.com>
Distribution: na
Organization: St. Peter's College, US
Lines: 26

In article <37169@cup.portal.com>, Azog-Thoth@cup.portal.com (William Thomas Daugustine) writes:
> 
> How does one tell the difference between a Qbuss module and a Unibuss
> module? Physcally, that is. Ive never had the pleasure of working on
> Qbuss stuff, and have a memory card that I dont quite know what is.

  Well, you could look for the grant lines on the connector. Unibus boards
normally have either 4 sets of 2 fingers wired together, or an interrupt
priority plug.

  On DEC modules, the Q-bus stuff is normally named xxV11 or xxQ11, while
the Unibus stuff is xx11 or xxU11.

  Having said all that, there isn't a lot of dual-width Unibus stuff. Most
of it is either bus cables/terminators/bootstraps or boards for dedicated
slots in special backplanes. Thus I think you have a Q-bus board.

  If you want an MS11-LD (128Kw parity) or MS11-MB (128Kw ECC), drop me a
message and we'll arrange a time for you to pick it up. It should fit in
whatever mode of transportation you use 8-). Since it's all the memory
a '34 can address, you can just pull whatever boards you have in the '34
out and not worry about slots.

	Terry Kennedy		Operations Manager, Academic Computing
	terry@spcvxa.bitnet	St. Peter's College, US
	terry@spcvxa.spc.edu	(201) 915-9381