On 21 Nov 2006 at 19:42, Jos Dreesen / Marian Capel wrote:
Am i the only one that feels that using modern
FPGA's to recreate old
CPU's is getting dangerously close to just running an emulation on a
modern PC ?
Well, I've done my fair time on the old equipment; in my old age, my
ears ring constantly (I've never attended a rock concert nor operated
heavy equipment without ear protection), I've dug crumpled and torn
cards out of card readers; picked bits of ribbon out of printers and
done all sorts of other unpleasant chores Old equipment for the sake
of being old doesn't interest me.
On the other hand, implementing a CPU in software, while being very
useful when one needs something to check out the operation of legacy
code, isn't quite the same to me as doing it in hardware, even if
said hardware is really "programmed" also. A matter of degree, I
suspect.
There apparently used to be a fellow who implemented pin-compatible
FPGA replacements for the Z80 and 6502 using Xilinx 4013's, but I
can't find any details of his work. One of the modern chip
suppliers, Innovasic, offers drop-in FPGA replacements for old MPUs
and other circuits.
Cheers,
Chuck