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From: cetron%utah-ced@UTAH-CS.ARPA (Ed Cetron)
Newsgroups: mod.computers.vax
Subject: Re:  Q18 to Q22 bus conversion
Message-ID: <8701061640.AA05920@utah-ced.ARPA>
Date: Tue, 6-Jan-87 11:40:20 EST
Article-I.D.: utah-ced.8701061640.AA05920
Posted: Tue Jan  6 11:40:20 1987
Date-Received: Tue, 6-Jan-87 23:18:54 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 12
Approved: info-vax@sri-kl.arpa

this is true for most of the 'newer' old q-bus backplanes.  Most of the newer
newer backplanes have all the lines connected anyway.... I have done at least
6 upgrades, and know of dozens more.... One must remember however, that several
old q-bus boards USE THOSE LINES FOR OTHER PURPOSES, and will cripple any true
22-bit boards.... Other boards (such as the rxv11) only do 18-bit DMA and are
also hard to work with, and others (such as the bdv11) don't properly terminate
the extra 4 bits.....

	bottom line:  with some caveat's, it can be done easily....

-ed cetron
center for engineering design