>I guess I'm coming into this late. What kind of part are you thinking of
>using (DSP?)
Scenix. :-)
50MHz SX18 with a CPLD that makes a register set for the 6502 to talk to in
memory. Basically write two values (bytes or words) and then write a 5th
location that serves as the operation type (mul, div, sqrt, whatever...) and
a "go" signal to the Scenix.
I don't remember the exact numbers, but I think it came out to something
like ~16 6502 instructions for a 16x16 signed multiply (including store and
fetch). 8x8 multiplies were like one 6502 instruction (time-wise on a Space
Duel).
A 100MHz part buys you a little better performance. (Most of the time is
just in storing and reading the 4 bytes of the math registers.)
-Clay
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