Processor 6502 Clock speed 1.79 MHz (NTSC) 1.77 MHz (PAL) RAM 8 KB Later versions: 16 KB ROM 10 KB Release year 1979 Production stopped ??? O.S. version(s) 400/800 O.S. Cartridge port(s) 1 Adress space : 8 KB Built-in software None Controller port(s) 4 Function keys Reset, option, select, start Parallel Bus Interface No Cosmetics Brown 'box', membrane keyboard