Abstract: A TV game machine includes connectors for detachably connecting a plurality of memory cartridges each having at least non-volatile memories containing a game program, picture data and sound data, a cartridge selecting circuit for selectively accessing one of the memory cartridges in cooperation with an externally controllable switch and the connectors, and a processor for executing the game program of the selected game cartridge while processing the picture data and sound data contained therein. A display panel is provided which is divided into a plurality of panel units each corresponding to the respective game cartridges for illuminating one segment at a time in response to a switch command.