Re: Unusual Paymar adapter

["Silicon Sam" <SiliconSam@gmail.com>]

Michael J. Mahon wrote:
> Silicon Sam wrote:
> > Michael J. Mahon wrote:
> >
> >>In going through some boxes (!), I found an unusual Dan Paymar adapter.
> >>
> >>It is a "daughtercard" that plugs into a ROM socket (probably the
> >>character ROM), and has on top two 24-pin sockets (for other ROMs),
> >>and also two wires about 4" long going to a small socket adapter
> >>having a 16-pin plug on the bottom and a 16-pin socket on top, with
> >>a 14-pin 'LS74 plugged into it.
> >>
> >>The daughtercard also has two ICs, a 7404 and a 7410, plus a
> >>decoupling capacitor.  The manufacturing date code on the
> >>card is 7639, so this is a *very* early mod.
> >>
> >>I'm guessing that the 'LS74 is used to switch between the two
> >>ROMs, but I have no documentation or software.
> >>
> >>Does anyone know about this?
> >>
> >>-michael
> >
> >
> >
> >   Not sure where you got the manufacturing date.  I have one of those
> > too.  On the top of the larger board, it has a number 2814 scribed in
> > it.  I will assume the serial number. On the bottom, it has Copyright
> > 1978 Dan Paymar.  The 24 pin chip on the large board has a label of
> > CGR-002 and a manufacturing date of 7942.
>
> It is stamped on the board in black ink.
>
> Mine is a single-sided printed circuit board, with all the
> wiring underneath.  "Copyright 1978 Dan Paymar" is there in
> copper, along with "+5V" and chip ids "04" and "10" and their
> pin "1" designations.
>
> -michael
>

  Sounds like the exact same one then.  Except for the S/N.  Mine was
done with what looks like one of them handheld engraving machines with
a metal tip.  The kind that buzz real loud.

Raymond