30 Oct
2011
30 Oct
'11
10:24 a.m.
On 29 Oct 2011 at 23:56, Eric Smith wrote:
You can't easily get all of the microprogram out
of those
electrically, because part of the microword is interpreted internally
by the microsequencer. It's probably easiest to read them by decap
and microscope. I've got spares of the basic and extended instruction
set CROMs, so I might do this. I only have one of the "POWR I/O"
CROM, so I don't want to sacrifice it. I haven't ever found the CROMs
for the IMP-4 and IMP-8, unfortunately.
Looking at the datasheet, I wonder if applying some smarts to the
readout process might get pretty much all that's needed. I'm not in
a position to say either way, as I don't have access to any CROMs--I
just remember them from "back when".
--Chuck