I seem to remember from the dark ages that the Atari cartridges could be made using a standard EPROM and ZIF socket and that there was an inverter on one leg of the EPROM. The guys that I knew who programmed EPROM's for missiles also made Atari cartridge copies. Somewhere I have a cigar box full of EPROM's of all of the common Atari 2600 games. I also have a piece of circuit board with a ZIF socket on it. Mike mmcfadden(a)cmh.edu