Re: Apple II mistery card...

[et472@FreeNet.Carleton.CA (Michael Black)]

Richard Kilpatrick (delorean@NOSPAMbtconnect.com) writes:
> On 17/8/04 9:23 am, in article XfjUc.22836$g4.429866@news2.nokia.com,
> "mario" <gianmarioRE.scottiMO@nokiaVE.com> wrote:
> 
>> But I have another mistery card: it has a 6522 (VIA) and another TTL IC on
>> it, nothing else. It has a cable that ends in a 25 DSUB female connector. It
>> could be some kind of parallel port, or maybe it's this Apple mouse card I
>> hear talking about. What do you gentlemen think?
> 
> Serial card of some sort, or possibly networking (lack of a buffer is
> confusing)? The Apple mouse card clearly says "mouse card" on it, and has a
> 9-pin connector. I've got one, but need an enhanced //e to use it in ;)
> 
> BBCs use 6522s for interfacing to the outside world via the Analogue ports.
> Perhaps it's some sort of interfacing card designed to work with a breakout
> cable.
> 
> Richard

It's not likely to be a serial card of any sort, since the 6522 is a
parallel interface.  It does have a shift register inside for serial
operation, but I've never heard much good about that feature and nobody
would pick the device merely for serial interface.

If there's nothing on the board besides the 6522 and tiny bits of TTL
to interface it to the bus, then whatever it was originally intended for,
it's a parallel board.

  Michael