Eprom 27c256/27c512

This project was build to program the original 1980's EPROMS, the typical UV erasable glass top ones used in many projects back in the day. This initial version only programs the 256k or 512k (giving 32kb or 64kb) versions typically called 27C256 or 27C512.

The main reason for just these two so far is that I used it to help build some RC2014 z80 retro computers - so far it has successfully programmed EPROMS from:

sc108 z80 CPU board by Stephen C Cousins.

sc114 z80 SBC computer by Stephen C Cousins

simple80 SBC by Plasmo (AKA Bill Shen)

They are now all running perfectly.

Note: you will need a 12.7v PSU, I used my bench power supply for this to save on cost. It really does need to be 12.7 and not 12v. Other suggestions would be a cheap buck (step up) voltage converter. I have used one from Ebay and it seems to work fine. So the whole board can be powered at 5v.