Re: Unusual Paymar adapter

["Michael J. Mahon" <mjmahon@aol.com>]

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

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