25 May
2013
25 May
'13
3:25 a.m.
Credit given from the start. Simply going by the only photo that I found
using Google search. Not at all familiar with the Imlac. Wonder if they
shifted their implementation at some point, or whether the photo that I
referenced is simply misleading?
Thanks for the pointer to your photos; very clear :->. Definitely unlike
my 21-slot bus chassis.
On Fri, May 24, 2013 at 10:35 AM, Josh Dersch <derschjo at gmail.com> wrote:
On 5/24/2013 2:55 AM, Paul Birkel wrote:
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?
The Imlac cards are 6.5" tall by 5" wide.
(Does anyone else recognize this description?
It's 70/80's-era.)
However based on http://www.blinkenlights.com/**
classiccmp/imlac/imlac5.jpg<http://www.blinkenlights.com/classiccmp/imla…
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.
Give me a little credit, OK?
https://plus.google.com/u/0/**photos/117997069161125071032/**
albums/5876233738507595185<https://plus.google.com/u/0/photos/1179970691…
- Josh
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<http:/…
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
>
>