Old EPROM questions again, EPROM Programmer

From: RMaxwell_at_atlantissi.com <(RMaxwell_at_atlantissi.com)>
Date: Wed Jul 28 08:11:37 2004

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
 
Received on Wed Jul 28 2004 - 08:11:37 BST