Old EPROM questions again, EPROM Programmer

From: Dwight K. Elvey <dwight.elvey_at_amd.com>
Date: Wed Jul 28 19:41:06 2004

>From: ard_at_p850ug1.demon.co.uk
---snip---
>
>I built my first EPROM programmer about 18 years ago. Programs
>2716-27128, using the 'slow' algorithm. It doesn't even handle 12.5V
>parts (I should add that feature!). 3 hand-wired boards of mostly TTL,
>with a 40 pin AY-3-1015 UART in the middle. Oh yes, it's an EPROM
>emulator as well, for the same types of EPROMs.
>

Hi
 My first programmer was also built to do 2716's. I put it
on a prototype board in my H89. It only needed a few parts.
The H89 was my second computer, my first was a Poly88.
I made an adapter socket with two switches to expand
the programmer to do 2732's and 2764's. I even added
a jumper select for VPP levels.
 My favorite programmer is the 4004 developement system
I have. It only does 1702A's but with a little modification
of firmware can handle 1702's as well. How many out there
actually have 1702's ( not the same as 1702A's )?
 For general purposes, the Needham works fine. I have a schematic
for this that someone else drew up but I have no way to read.
It is in some schmatic program format. I'd love to get it
into a pdf to print out. I'm told that the main issue with
the PB-10 is that they have filled the entire table for PROM
types. Of course, with the schematic, one should be able
to write their own code for other devices if the voltages
needed are supported. One could also strip out many of the smart
algorithms and just use the generic one. This would free up
a lot of the space in the tables.
Dwight
Received on Wed Jul 28 2004 - 19:41:06 BST