seeking Motorola M68MM01A2 documentation

[Jonathan Chapman]

Mike,

We use PCB Cart for boards with hard gold edge contacts, like our DEC prototyping board, Apple II protoboard, XT-IDE, etc. They are the same Chinese board house used by s100computers.com and N8VEM/RetroBrew Computers. Results are pretty good for the price.

Expect to order 25 to make hard gold edge plating worthwhile. It'll pretty much double the price of the board, but PCB Cart does proper selective hard gold, not "heavy ENIG" (not a thing) or some other nonsense. A lot of the cheaper places will only plate "hard gold" over ENIG, which I assume means they don't actually have a selective process at all.

Make sure to specify an edge chamfer if it's a typical card edge connector, otherwise it'll be routed square and a little difficult to insert/you'll have to dress it down with a file.

If practical for the board, remove unused contacts from the edge connector. They charge per-contact as a way to guesstimate their gold costs.

Thanks,
Jonathan

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Wednesday, January 19th, 2022 at 12:05, Mike Katz via cctalk <cctalk at classiccmp.org> wrote:

> Johnathan,
>
> I saw you will be ordering boards pretty soon.
>
> I need to order some boards for my PDP-8/E but I've never ordered boards
>
> before.
>
> What board house do you use? Have you ever specified gold fingers before?
>
> Any advice would be greatly appreciated.
>
> Thanks,
>
> Mike
>
> +1 (773) 414-1044
>
> On 1/19/2022 9:49 AM, Jonathan Chapman via cctalk wrote:
>
> > Chris,
> >
> > I'm probably going to order some of these on my next circuit board order (this week or next), do you want a set of them? Seems they are of course "hacking required," which is fine by me :P
> >
> > Thanks,
> >
> > Jonathan
> >
> > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> >
> > On Wednesday, January 19th, 2022 at 10:24, Chris Elmquist via cctalk cctalk at classiccmp.org wrote:
> >
> > > On Wednesday (01/19/2022 at 03:35PM +0100), Jos Dreesen via cctalk wrote:
> > >
> > > > On 19.01.22 13:15, Jonathan Chapman via cctalk wrote:
> > > >
> > > > > That's a neat board! Where can I/we order one?
> > > > >
> > > > > With me...
> > > >
> > > > 20 Eur for the set of 2 + shipping.
> > > >
> > > > If you are in the US it is probably cheaper to order new ones locally.
> > > >
> > > > Note that I never completed the documentation or wrote the code for the hex keyboard.
> > > >
> > > > But it does run the Tektronix board-bucket BASIC via serial port !
> > > >
> > > > Find more on ftp://ftp.dreesen.ch/TEK_BB
> > > >
> > > > ah ha! that's what I was looking for. Will check it out in detail.
> > >
> > > I think I am "forum challenged" as all I could see at the original link
> > >
> > > were renderings of the board.
> > >
> > > Thanks Jos. Maybe this will be the ticket...
> > >
> > > Chris
> > >
> > > Chris Elmquist