BA23 w/RA70

From: Daniel T. Burrows <dburrows_at_netpath.net>
Date: Thu Oct 19 10:06:32 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 <geneb_at_deltasoft.com>
To: classiccmp_at_classiccmp.org <classiccmp_at_classiccmp.org>
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.
Received on Thu Oct 19 2000 - 10:06:32 BST