Re: Clone IOU / MMU Chip

["David Wilson" <mcs6502@gmail.com>]

Bryan Parkoff wrote:
>     Are you sure that schematics of MPF-III is not identical to Jim Sather's
> schematic?

Yes. I bought my MPF-III on 28-Feb-1984 and Jim Sather's book was not
published until 1985.

>  Do you expect that schematic of MPF-III can be duplicated and be
> built in custom chip on the MMU / IOU sockets of Apple //e's motherboard.

While the MPF-III is functionally equivalent to the IIe (with a few
minor differences that I worked around by replacing one PAL with a
larger GAL [as the MPF-III came with an integrated 2K 80 column card
its support for AUX_ZP bank switching was non-existant]) but may not be
partitioned in the same way as an MMU/IOU pair. I am sure this could be
worked out.

> How can I obtain schematic of MPF-III for curiousity?

The copy I have is an Nth generation photocopy so may not scan very
well. I will see what can be done.