BA23 w/RA70

From: Gene Buckle <geneb_at_deltasoft.com>
Date: Thu Oct 19 12:56:41 2000

Then the PDP-11/73 I've got is 22 bit? (I *think* it's a 73)

g.


On Thu, 19 Oct 2000, Daniel T. Burrows wrote:

> 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 - 12:56:41 BST