ST also has a M27C322 that comes in a 2Mx16 PDIP but those are harder to find. It looks like Mouser may have some of those in stock now, http://www.mouser.com/products/detail.cfm?mpart=511-M27C322-10F&CustRef=&source=search&CFID=12047124&CFTOKEN=97231936 .
> > could you make some sort of schematic on how to wire up sockets to the proper pins on a cart's edge connector? I'm especially interested in 16 and 32 mbit games.. I know 8 mbit are possible using 2 27c4001 eproms in parallel without any extra electronics. would 16+ mbit require extra electronics?
> If you can get 1Mx8 or 2Mx8 EPROMs or Flash ROMs, you'd be able to wire them up to the Genesis without any extra electronics. But to my knowledge, there aren't any in a PDIP package, they're all in SMD packages which are pretty hard to solder with your bare hands.
> I could draw a schematic using 2 4MBit Flash ROMs (=1MByte) wiring up to the Genesis if you want. But I'm sure there's already something like this out there in the 'net.