29 Sep
2014
29 Sep
'14
5:43 a.m.
On Sep 29, 2014, at 3:01, Pete Turnbull <pete at dunnington.plus.com> wrote:
(sorry to respond to a response, but for some reason I don't
see the original around here)
I've done a 22-bit upgrade to H9270, which is a little different
in that it has wire-wrap and it's a 4-slot, serpentine
backplane. The general procedure is basically the same,
though: bus the BDAL18-21 lines together in the same
order that the rest of the lines are bussed on the existing
backplane. Not a lot of work for a whole lot of gain.
I have an H9273 backplane (only, no card cage) that I'm
keeping at 18 bits for the moment in order to be able to
test compatibility of some QBUS boards when I finally
get around to making them. Orthogonal to this conversation,
if anyone has advice on fabricating (or finding) a card cage,
I'm interested.
- Dave
On 29/09/2014 05:26, Noel Chiappa wrote:
So now I'm thinking, maybe I'll just add the BDAL19-22 lines to the existing
H9273-A. It doesn't have wirewrap pins, but there's enough pin showing that I
can get two wires onto each pin, and solder them; does not look to be
difficult at all.
> So, has anyone tried to upgrade an H9273-A to H9276-A, and are there any
> pitfalls? From what I can see, there shouldn't be a problem, but I'd like
> to be 100% sure before I start plugging cards into it...