26 Sep
2014
26 Sep
'14
1:01 p.m.
From: Roe Peterson
I need a wire wrap tool for qbus/unibus. What size
for those pins?
None of my current DEC backplanes have wire-wrap pins (these are all PCBs),
_but_ I just measured some wire-wrap configuration pins on QBUS boards, which
look to be about the same size as I recall UNIBUS backplane pins being, and
those are .7mm / .025".
Doesn't the tool also depend on the wire gauge?
From: Jay West
I just assumed there was only was size.....
Some of the older machines (I specifically remember it being either the PDP-6
or KA-10, but I forget which) used pins (and wire) which was significantly
larger than those in the PDP-11. But I think all the -11's (both busses) used
pins of the same size. (I don't recall ever seeing one different, I'm pretty
sure.)
Noel
26 Sep
26 Sep
1:49 p.m.
On Sep 26, 2014, at 4:01 PM, Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote:
I think most if not all Qbus backplanes were PCBs. But some of them
(notably the H9270) are PCBs with wire-wrap posts for the connector
terminals. Makes it very handy to, say, modify the H9270 for 22-bit,
which I did with a cheap handheld "screwdriver" type wire-wrap tool
with no problem.
- Dave
From: Roe
Peterson
I need a wire wrap tool for qbus/unibus. What
size for those pins?
None of my current DEC backplanes have wire-wrap pins (these are all PCBs),
_but_ I just measured some wire-wrap configuration pins on QBUS boards, which
look to be about the same size as I recall UNIBUS backplane pins being, and
those are .7mm / .025".
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