which emulators you after? ones like cc64 for the commodore 64 need the ROM, which is a software version of a chip that is in the machine. usually you need to pay for the ROM but sometimes you can find it free. keep looking, cant help you as its been a couple of years since i had one. system requirements - had trouble using a couple of emulators on WinME, but emulators of old machines dont need much.