Re: Grappler+ as IO card?

aiiadict@xxxxxxxxx wrote:
On Apr 30, 8:32 am, David Schmenk <dschm...@xxxxxxxxxxxxxx> 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...
.

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