David Wilson wrote:
I have a copy of the manual for the Serial Interface Card and the firmware listing is for Revision 3 dated July 21, 1978 written by James R Huston (P7-03 P8-01). Looks like P7 is the 256 byte slot ROM while P8 is a 512 byte ROM covering $C800..$C9FF. I cannot read who signed the schematic.
That's interesting. Since I doubt that it was intended to function above 9600 bps, then a shift register and software would have been quite enough (though it would have monopolized the processor). Any chance you could post the schematic? -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."