RE: 6510 CPU extensions

From: Gideon Zweijtzer (
Date: 2002-05-02 06:27:27

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    >If you want to be flexible, maybe you want to have a look at my CS/A65
    >machine. The CPU card has a 74LS610, which maps addresses:
    > [...]
    >So each of the 16 4k blocks can be mapped from a 1M address space
    >Maybe you also want to include this in your CPU...
    Thank you Andre, for your input. The new CPU will have a more elaborate MMU
    unit, and will certainly include the basic mapping possibilities that you
    described. The goal is to provide a way to run multiple original 6502 code
    pieces anywhere in system memory at the same time, for each of those
    "thinking" that they are running from $0000-$ffff. Another feature will be
    protection and bus-selection. The latter is necessary to define regions that
    are not memory, but I/O. Memory accesses will go to the SDRAM bus, I/O
    accesses to the original address/data bus.
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