Re: Unusual Paymar adapter

[bieling@terra.es]

Michael J. Mahon ha escrito:

> Jorge ChB wrote:
> > Michael J. Mahon <mjmahon@aol.com> 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?
> >
> >
> > I had a "Dan Paymar's lowercase adapter", but iirc it was little more
> > than a ROM that replaced the onboard char. gen. ROM.
> > This one you've found must be a "deluxe" version or something.
> > My best guess is that the extra circuitry is there to engage somehow
> > alternate characters when in inverse or flash modes..?
>
> I also had the single-EPROM "lower case adapter" for my ][+.
> This one is quite different.
>
> It could even be an alternate character set...

It may be an LCA-2 ?
There's somebody selling the manual in ebay:
item #8816466656