BA23 w/RA70 - test-drb@ccmp.vtda.org

19 Oct 2000

The BA123 is 22 bit.  I use one for a test bed and always keep a spare as I
run it with the covers off and have fried a few power supplies over the
years.  The fans just don't do the job with all the covers off.:(.  The
BA123 is much nicer on the hands to swap boards than a BA23.
Dan
-----Original Message-----
From: Gene Buckle &lt;geneb(a)deltasoft.com&gt;
To: classiccmp(a)classiccmp.org &lt;classiccmp(a)classiccmp.org&gt;
Date: Thursday, October 19, 2000 11:03 AM
Subject: Re: BA23 w/RA70

...
  >Be very careful with that chassis!  If it was
really a MicroPDP, it will
 >have an 18 bit qbus backplane in it.  It will _destroy_ 22 bit qbus boards
...
  >since there are power pins on the 18 bit bus that
mate to data pins on the
...
  22 bit bus.

Then again, my memory may be completely broken and I've got it all wrong.  :)

g. 
 I think you are remembering the BA11S and others.  All the BA23's I have had
...
  and seen have all had 22 bit backplanes.  ( I have at
least 15 BA23's at the
...
  moment.) 
I think I was thinking of the BA123 I've got that IS a uPDP-11.  (full of
boards too *sigh*)

g.