Re: 6510 CPU extensions

From: Andre Fachat (
Date: 2002-04-28 20:51:38

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    What about the 6509? That is a 6502 with the difference that it has 
    4 more address lines. The output values of the 4 address bits is
    determined by the values of register 0 and 1. register 1 is used for 
    the data load and store operations in the lda (),y and sta (),y 
    opcodes and reg. 0 otherwise. (r0/r1 maybe vice versa, but in principle
    that is it).
    This CPU is not available anymore as far as I know. So it would be good
    to have a hardware replacement for it.
    Gideon Zweijtzer wrote:
    > |BTW: what's your opinion, should it be possible to modify your design
    > |for emulating a 8501 CPU (the heart of C16 / C116 / Plus/4)?
    > Of course, that shouldn't be a problem; I think it is just a 6502 with some
    > tiny modifications. I am planning to implement the 65816 as well, since
    > there are many users.
    > Gideon
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