Hi Vitally,

I can understand buying off the shelf.

In my case I build a custom programmer for each chip type because it is just a socket or a component change. The time taken to make a new programmer is less than the time taken to get the PROM code right.

If you do write an upload program iHEX I would be interested. I have written a GUI GRBL G-Code Sender before but I am bit (always) busy with other projects.

Actually GTKTerm (linux) would work out of the box. Just need to write the Arduino iHex interface, if there is not already a library for it. Actually I have write an iHEX import routine for one of my CP/M projects. So next time I want program a PROM chip I will have a look at uploading iHEX files from GTKTerm.

Regards Alan

Hi Vitaly,

As far as programming small EEPROMs, it is pretty easy to store the code in a "C array" in the Ardunio Nano. I code 16kb at a time (two passes) with my programmer (for a AT29C256).

There are plenty on iHEX to C array programs on the Internet.

For bigger EEPROMs I have used a Meduino which has about ~240kb free flash memory. So you can program the larger chips pretty easily. I programmed a W29C020 in two passes.
Although I have programmed high voltage (if 9-16v is high voltage?) chips, it is just so much easier to use the 5V program voltage versions.

With regard to switch high voltages (from 5v to say 16v), I use a 7805 voltage regulator.

Set it up with a resistor network to increase the output voltage (i.e. 180R between Output and Common, and 390R between Common and Ground. If you pull down the Common to ground (i.e. short the 390R) the Output voltage will be 5v, otherwise it will be 16v. The 7805 switches very quickly, but the LM317 does not.

Here is an example design: https://cdn.hackaday.io/images/2676101562896315166.JPG

Regards Alan

Thank you Alan,
I tried to make an universal programmer for parallel EEPROM but then bought tl866 and put it off :)