Rumor has it that Chuck Guzis may have mentioned these words:
Has anyone here done much programming of Motorola
68764s? I'm using
my usually reliable EZEP programmer, but the EPROMs don't show a good
erase (after an hour in the eraser, I can still see bytes with F7/F3
values). And trying to program 00 fails on the first byte after 25
pulses, showing 07 instead of 00.\
Hrm, I picked up a "mongo" eraser on ePay a few years ago, it's a
spectroline PR320t, it usually takes 30-45 minutes or so to erase them,
IIRC. It'll do 25-30 in a batch... it's *big*. ;-)
I have had a few duds (maybe 3-5% tops) but generally the ones that verify
the erase work fine.
My "low-end" Xeltek programmer (Superpro/L) programs & verifies them just
fine - I've had no real problems at all (well, again, except for the duds)
unless my homemade cradle adapter (lovingly crafted from 2 wire-wrap
sockets to "rub" the contacts on the eprom - they're in HHC carriers) has a
bad contact.
The programmer's DOS software seems to set all the right parameters to
"just work."
As I've had precious few problems, I'm afraid beyond that I can't be a ton
o'help... That said, I hope this does help at least a little.
If you're not in a hurry, I could erase & verify some for you if you want -
it'll be at least a few weeks before I'd have time to do that, and you'd
have to (carefully) extricate the chips from the HHC carriers yourself.
That said, once I had the time, I'd even be happy to program & verify them
for you if you sent me the PROM files - my xeltek software recognizes
straight binary, Intel hex & Moto S, IIRC.
HTH,
Roger "Merch" Merchberger
--
Roger "Merch" Merchberger | "Profile, don't speculate."
SysAdmin, Iceberg Computers | Daniel J. Bernstein
zmerch at
30below.com |