Yes, the Radio Shack/Tandy FD-502 takes a 2764, or with a hack, the 27128. Most of the third party controllers use the 2764 or 27128, Bruce W. > Isn't a 2764 EPROM directly compatible with socketed CoCo floppy > controllers? > Is there a 24-pin version *and* a 28-pin version? > > > -- > Roger Taylor