I'm trying to design an EPROM/EEPROM and Flash programmer that will operate from the cartridge slot of an Atari 8-bit computer. There was one available commercially but it is no longer available.

The device needs to be able to program a host of standard DIP packaged ROMs without any extra adapter boards. It also needs to be entirely software driven and controlled by the host computer ... i.e. no manual switches on the board for selecting ground and Vpp on the ROM.

The problem I have is in understanding the differences between Analog switches and Relays in relation to this project. I was originally going to use some Analog switches for setting up the ground and Vpp lines. However, I've just read a Maxim application note which states that there is virtually no supply current from an Analog switch when its input is at ground. At least that's how I understood it.

If that's true then I have to use relays. Am I right in all of this?