Impetus

Commodore VIC-20 ColecoVision Tomy Tutor / Pyuta / Grandstand Tutor SG-1000 Game.com Apple IIGS Atari 7800 Watara/QuickShot Supervision Mega Duck/Cougar Boy Atari 8-bit PC-9800 Series PC-8800 Series Commodore C64/128/MAX ZX Spectrum WonderSwan Atari Lynx Sharp X1 Legacy Computer TRS-80 Color Computer Commodore PET Sega Game Gear TurboGrafx-16/PC Engine Commodore 16 Atari 5200 DOS Apple II WonderSwan Color Sharp MZ-2200 FM-7 NEC PC-6000 Series Amstrad CPC Sega Master System/Mark III Texas Instruments TI-99 MSX