I have a hardware/software design for a simple EPROM programmer on my site ... unfortunately, it was designed years ago when I was still fairly new at hardware design and it shows ... Works well however and I still use one of them from time to time (quicker and easier than my 29B). It's completely stand-alone with a 8-digit LED display and a keypad. It can upload/download Intel or Motorola HEX format data via a serial port, and also has a "remote" mode for total computer control. It only does 2716, 2732, 2764, 27128 and 27256 family devices (all I needed at the time), although you could design adapters and modify the code to support other devices if you wanted (I did one for 8051's at one point). Parts might be a bit hard to find now - uses a 6809 CPU, 6821 PIA, a 6551 UART, a few 6264 SRAM's, a handful of latches and 3-4 relays to move the power/programming voltage around (ok - I didn't know a better way at the time). You could redesign it using a modern single-chip MCU and better power control and reduce the parts count considerably. You could make a much simpler device if you want to make it rely on a PeeCee and it's parallel port - I did a "quickie" 29040 flash programmer a few years back which was literally nothing more than 3 8-bit latches and a decoder chip (and some software on the PC side). Regards, -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector. http://www.parse.com/~ddunfield/museum/index.html