11/73 into 11/03 chassis?

Robert Jarratt robert.jarratt at ntlworld.com
Tue Feb 9 13:48:40 CST 2016

> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Noel
> Chiappa
> Sent: 09 February 2016 16:27
> To: cctalk at classiccmp.org
> Cc: jnc at mercury.lcs.mit.edu
> Subject: Re: 11/73 into 11/03 chassis?
>     > From: Jacob Ritorto
>     > Can I tear apart my little BA23 .. and put the Micro/PDP-11
>     > .. into the spot that my 11/03 backplane currently occupies and run
>     > via the (working) stock 11/03 power supply?
>     > ...
>     > Specifically, would I have to butcher power and clock lines to do
>     > or is it all plug compatible?
> I'm not absolutely sure exactly what you have that's holding the '11/03
> backplane'; if it's a standard BA11-M enclosure, the answer, sadly, is
> The BA-23 uses the H9278-A backplane and H7864 power supply; the BA11-M
> uses the H9270-A and H780 backplane. The power connections between the
> first two are completely different from the latter pair; the first uses a
> single-width Molex-type connector, the latter uses bare wire ends to a
> terminal block on the backplane.
> Also, the H9270-A is a four-slot backplane, and the H9278-A (an
> almost certainly will not physically fit into the space for the former.
> If your '11/03 backplane' is a different kind of backplane, in some other
> of box (e.g. BA11-N or BA11-S), the answer, sadly, is still 'no', because
> both also use terminal blocks for power. (Although if you have a BA11-S,
> you'd already be set, those are Q22 native.)
> Really, it's not that hard to upgrade an H9270-A (or the H9273-A in a
> to Q22 (I have done several of the latter); the transplant you speak of
> it possible) is on the same order of magnitude of work.
> 	Noel
> PS: In dragging my BA23 out to look at it, it dawned on me that I will
> never, ever use it - I now have several BA11-N/S boxes, and prefer them.
> don't need to run the later disks that need the BA23.) So if someone is
> interested in the either the BA23, or the spare H7864 I have for it,
please let
> me know. I'll let either go for my original cost plus shipping.

Is this in the USA?



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