24 May
2013
24 May
'13
2:55 a.m.
Josh;
I have a similar problem with a generic-bus (21 slots) that uses 40x2,
rather than the S100 50x2, configuration.
I'm curious about the dimensions of the Imlac cards; maybe mine are the
same?
My cage expects cards that are ~7.6" (7 5/8") wide and ~8.9" (8
15/16")
tall. The tab that holds the 40x2 "pins" is ~5 1/8" wide. The typical
card also has a matching tab along the top edge that is used for I/O to
external equipment. How do these dimensions compare to yours?
(Does anyone else recognize this description? It's 70/80's-era.)
However based on http://www.blinkenlights.com/classiccmp/imlac/imlac5.jpg I
don't understand why you think that a cut-down S100 board would work -- the
photo looks like real-pins, whereas the Digikey part and S100 are both
card-edge systems. Not pinned-connectors.
On Fri, May 24, 2013 at 12:57 AM, Josh Dersch <derschjo at gmail.com> wrote:
Hey all--
I'm going to need to build an extender board or two for my Imlac in the
next few weeks to aid in debugging. (Now that I have the power supplies up
and running, there are a lot of stuck bits here and there in the CPU and
it'd be really, really useful to have easy access to the chips for testing.)
The cards have an 80-pin edge connector (40 pins per side) with a .125"
spacing (same as S-100).
I figured I'd look for a source of prototype boards & edge connectors with
.125" spaced fingers on them and build a couple by hand, but I'm not having
a great deal of luck finding the boards. Digi-Key comes close in that they
actually have S-100 prototype boards listed, but of course they have none
in stock; this -
http://www.digikey.com/product-detail/en/4610/V1111-ND/146808 - is close
but has too few connectors.
I suppose I could track down an S-100 prototyping / extender board and
hack it down to the right size but I'd rather not destroy something. And
since I'm only going to need one or two of these I don't see a lot of sense
in having some fabricated.
Any suggestions on where to find parts for this project?
Thanks,
Josh