> is there any way to test a 6509 in place of a 6502 to test it ?
> (with a simple adaptator board)
The 6509 is missing some signals that the 6502 has. It also reserves
memory locations $00 and $01 for memory segment management. If your
application/device is using these signals or memory locations, 6509 will
not work as a drop replacement for 6502. Otherwise, if you ignore the
A16-A19 lines, it should be compatible.
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