aiiadict@gmail.com wrote:
On Apr 30, 8:32 am, David Schmenk <dschm...@YUCH.gmail.com> wrote:the only bi-directional parallel card I know of is the Apple Parallel Interface Card...I think a few people figured this out, have you noticed what they go for on ePay? Its easier and more flexible to just plug a 6522 (pretty cheap from JDR) into a LittleProto board. BTW, the LittleProto board rocks.I have schematics for a 6522 Apple II interface card. 6522 has some neat features besides I/O ports Rich
Its pretty much a direct connection. I just had to run phi1 through an inverter as the only other chip. Why didn't Woz include phi2 on the bus? One of the great mysteries. I agree with you and Michael that the timers and interrupts are great features - the reason I put mine together.
Dave...