12 Aug
2009
12 Aug
'09
9:53 p.m.
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.
I'm using Vcc of +6 and Vpp of +25. These EPROMs are supposedly NOS
and have date codes of 1982.
Any suggestions?
Thanks,
Chuck