At 01:45 01.05.2007 +0000, you wrote:

>How could one go about making the FPGA64 use the onboard 65816 so that
>I could drop the 6502 part of the core?

The 65816 is on the same address and data bus as
the memory and lots of other parts of the C-One
mainboard, therefore it will most probably not
run at full speed (capacitive load will be too
high - I'd start at 1MHz to make everythign as
simple as possible). However, it should be
possible to control the address bus of the 65816
in a way that it's compatible: Like the 6510, the
65816 can 3-state it's address lines, which would
be the solution to the arising problems. Further,
you might need to stretch clocks in order to slip in video memory accesses.

Do you have all necessary pinouts, or do you need me to extract that again?

ciao,
--
Jens Schönfeld