28 Jul
2004
28 Jul
'04
1:11 a.m.
Wolfgang,
Philip Pemberton is right... it's not difficult, and for programming 2716,
2732 and 2532, it's even easier. The 4040 CMOS counter has exactly the
right number of outputs to handle all 12 address lines on a 2?32, and the
programming specifications for all those devices allow for a fixed-length
programming pulse, so the programmer can receive the byte, set BUSY on the
Centronics interface, time the 50ms locally, then clear BUSY to accept the
next byte... print your EPROM!
I know this well, because that's how I did it. I've used it with a
Sol-20, OSI Superboard 2, and IBM XT clone. If you would like the
schematics for my version (which assumes 2 unidirectional parallel
interfaces - one each direction - very common at the time), just let me know
and I will scan them (2 letter-size pages) into your preferred format and
e-mail them. The BASIC program I wrote is for the Superboard, so the
hardware stuff won't apply, but the program is reasonably structured... for
BASIC.
Best regards,
Bob Maxwell
-----Original Message-----
(snip...)
There were many Eprom Programmers back when the 2532 etc.
were actual which
were designed for popular homecomputers (I own one for my
Pet too and know
of many for C=64). Many of these devices were "homebrewed
gear" or sold as
kits. But after lots of time googling around I haven't
found much stuff
about this old eproms. Okay, I have at least a bunch of
datasheets and some
schematics where ex. the 2532 were used and learned a lot
of early 1980's
hardware basics :) But I could not find some schematics
(and software) of
Eprom programmers dedicated to this chips. My (maybe dumb)
question: Does
anyone have some schematics and software (would be great)
for a little
homebrewed Eprom Programmer which works with a standard PC
parallel-port or
ISA slot? This would be a great project for rainy winter
days :)
Best Regards,
Wolfgang