On Jan 17, 8:01, Philip Pemberton wrote: The early cartridges were made with a form of low exteaction force sockets -- a kind of poor man's ZIF, designed to make it easier to extract the ROMs. You've probably got those. You put a small screwdriver blade in, against the bar, and twist (only when there's a chip in the socket!!) It's called the Master Series Welcome Guide. No, I'm not parting with mine just yet :-) AFAIR, 2732s should work, 2764s certainly work, and then up to 27128 is officially supported. You can use 27256s and *possibly* 27512s if you program them appropriately. -- Pete Peter Turnbull Network Manager University of York