Unibus (was Re: VMS Documentation CD-ROM &unibus question)
HP 9100?
Tony Duell wrote:
> >
> > --- Tony Duell <ard_at_p850ug1.demon.co.uk> wrote:
> > > As you mention below, it's 0.125" pitch. The only other common connector
> > > with that pitch is (IIRC) the S100 edge connector. Consider cutting some
> > > down :-) :-) It'll look a right mess, but it should work.
> >
> > I can get 28/56 pin connectors (~$4 each) and cut them down - I'm looking
> > at a Sullins EZA28DCSN. Given that I'm attempting to replicate a DEC H851,
>
> Right...
>
> > I suppose I could cut two down to size, but put them on a PCB with the cut
> > edges on opposite sides, providing for _some_ sort of left-right registration
> > integrity. The PCB would be about 2.5" by 1" with 72 holes. Depending on
>
> It's a bit of a kludge!
>
> > quantity, they might be <$10 for double-sided with plated-through holes.
> > A single-sided version I could do at home on a prototype run (never tried
> > to burn double-sided boards at home).
>
> I've done DS boards on the sort of setup you'd have at home (bubble etch
> tank, UV box). Worked fine -- registration was not as big a problem as
> you might think. But through-hole plating is impossible I think.
>
> >
> > This is a perfect example of why it's better buy than make electronic bits.
>
> True _if_ you can buy them. Otherwise you have to make them.
>
> >
> > > Incidentally, has anyone ever seen a 0.125" pitch 44 pin (22 pin DS) edge
> > > connector. No, I don't mean 0.156" (I was asking about those a few weeks
> > > back, I know). The 0.125" version is used as the expansion connector on
> > > one classic (very classic) desktop machine.
> >
> > Sullins has a 50/100 0.125" connector in a high-profile (0.265" insertion
> > depth) - EZA50DCSD You could cut _that_ down.
>
> My 44 pins was the total -- 22 each side. Which means the 56 pin
> connector (28 each side) could be cut down too.... It's still a kludge
> and I'd rather get the right part if at all possible.
>
> >
> > Anyone know of any other 0.125" edge connector manufacturers?
> >
> > > Minor puzzle : Which machine?
> >
> > No idea.
>
> OK, a few hints... Many people wouldn't call it a computer (although it
> is). There are a total of 8 ICs in it, and all are simple 8 pin devices.
> A fair number of transistors and diodes, but not as many as you'd expect.
>
> -tony
Received on Wed Jun 13 2001 - 20:04:29 BST
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