29 Sep
2014
29 Sep
'14
7:01 a.m.
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...
Yes, I've done it to a couple. For each BDAL line I used a suitable
length of wire-wrap wire to run the length of the bus plus an allowance
to wind once round each pin. I stripped somewhat over an inch of of
insulation from the end, then used the stripper to separate the
remaining insulation everywhere it would solder to a pin. Soldered one
end, wind once round every succeeding pin, and soldered each. So each
line ends up with a neat and almost straight length of wire. You'll be
able to see the route each has to follow by comparison to the PCB traces
when you take the backplane out.
--
Pete
Peter Turnbull