Cheapo EEPROM Programmer Topic:Homebrew Designs   Date: 2001-11-02 Printer Friendly:

Now that I have my 8048 dev system, I needed to start blowing some PROMS. I have a bunch of 2816 EEPROMS left over from my Z-80 project. Also, they are perfect companions for 8048/8051 systems. Here is a really cool EE programmer that I plan to build. I did hack up a programmer that worked well enough to build this PV Controller, but the circuit above is nicer. If you want to mess around with my circuit, the basic idea is that one line on the parallel port clears a 11 bit counter, one bit serves as the clock, one bit writes, one bit reads (assuming bidirectional here), and 8 bits serve as bidirectional data. The program opens up a binary file and writes a byte one at a time and increments the counter with the clock line. It then verifies the data by resetting the counter and reading in the data. Here is a C program I wrote for this purpose. It has lots of extra functions in it, so you should be able to adapt it to other purposes.