6 Jul
2012
6 Jul
'12
4 a.m.
On Jul 5, 2012, at 7:35 PM, Johnny Billquist wrote:
...
Oh, and I saw some additional discussions about the CIS option for the F11. Unless I
remember wrong, and understood things wrong, it is not just a simple PROM. It's a
coprocessor, which have logic in addition to whatever microcode the coprocessor need.
So no way of just duplicating a PROM to get a CIS.
Not unless someone could dig up the details. If it *is* just a PROM, even if it's an
oddball bipolar model with different interface specs, it should be easy to reproduce that
with a small FPGA. Any reasonable modern FPGA is way faster than a 1980s era bipolar
ROM, so modeling the interface timing should be easy. And level conversions should be
doable.
paul