aiiadict@gmail.com wrote:
Why so much interest? The 6522 would require several POKES and some PEEKS to get data from the ports.... Perhaps the ROM contains ML code to interface via PR# statements, like the applemouse card...
It would be interesting to see what the card was originally intended for, and what kind of ROM support was provided. Most general purpose 6522 cards didn't bother with a ROM, since they could be used for so many different purposes. -michael Music synthesis for 8-bit Apple II's! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it is seriously underused."