26 Jul
2010
26 Jul
'10
11:22 a.m.
Chuck,
I'm curious what you found to make you think the call was D3, etc.? I
looked and found a some
other processors which might have 16 bit immediate and wondered how you
figure the call, vs.
branch, etc. I can guess, but thought I'd ask a few blobs of hex might
put more eyeballs on
the puzzle.
Also on the subject of Fairchild, they did make test equipment and other
ATE equipment in the
50's and 60's. I wonder what the time frame is on the equipment, and if
it might predate 1972
by some time.
Jim
On 7/25/2010 8:50 PM, Chuck Guzis wrote:
I'm working with an old data sample (ca. 1979) to
a piece of
equipment that I do not have access to. I've identified some bits
and pieces of code and am trying to identify the processor.
Here's what I know. The processor is big-endian and appears to be
byte-addressable. The opcode for CALL appears to be D3 xx xx, where
xxxx is the address of the destination. 2C appears to be load
immediate instruction and is also 3 bytes long.
The code doesn't look tight enough to be a p-code implementation of
any sort.
Does this ring any bells to anyone?
--Chuck