I knocked up my programmer a few years ago - it's still running on a solderless breadboard. It programs 2764 up to the big 32 pin ones. It's running on a PIC16F877 (could be done on a 40-pin ATMEL device instead, though).
It's driven at 115200 baud via the serial port, and is menu driven.
To upload, simply paste the contents of the HEX file to the terminal window.
I need to knock up a schematic of what I did (away for some of the next few weeks, but will do when I get spare time).
Grant
