8 Sep
2005
8 Sep
'05
1:57 p.m.
What device
uses this RAM, and what are the control pins conencted to?
It's used in the MIT CADR lisp machine, for the m-memory, which is a
high speed scratch pad used by the microcode.
I wrote some programs to convert the original CAD files (in SUDS) into
verilog and I've been (slowly) working on getting them to simulate. I
want to boot one under simulation and eventually put one in a simple
fpga (hah, by the time I'm 75 at this rate). I figure they'll make nice
My experience with simulators suggests that's a massive _underestimate_
of the time it would take.
christmas gifts :-)
I've got it fetching microcode from the prom. Most of the problems have
been with 74 style 'parts' I have made - in some cases I had to guess
because I have no data sheet but I'm slowly fixing that.
FWIW< I have a reasonably complete set of TTL databooks from several
manufactueres. Let me know if there's any 74-series part you want me to
look up.
-tony