Re: Unusual Paymar adapter

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

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.

Raymond