>> If the motherboard looks like a typical Apple II mb, the memory cable would >> plug into the memory chip socket that is closest to the power supply AND to >> the back of the computer. If there is a chip in the socket, gently pry it >> out and plug the cable into the empty socket. > > Just to be on the safe side, is it a 74LS157/257? No! The cable plugs into a DRAM socket.