Schematics / Schematics / By Greg AcornAcornBBCBBC BBC Plus BBC MasterCommodoreVIC-20 64 128 Plus 4 PETSpectrumZX Spectrum ZX 81 Issue 1 ZX 80AppleApple II and II+ Apple IIc Apple IIgs Apple IIe MacintoshAtariAtari 2600 Atari 7800 Atari XEgs Atari 130XE Atari 800XLOricOric-1