Adventureland was written for the TRS-80, then ported to other systems, most of which didn't exist in 1978: Apple II, Atari 8-bit family, TI-99/4A, PET, VIC-20, Commodore 64, IBM PC, ZX Spectrum, BBC Micro, Acorn Electron, Dragon 32/64, and Exidy Sorcerer.
Adventureland was initially developed for the TRS-80 computer in 1978. It was later ported to a variety of other systems that were not available until after its initial release. These included Apple II, Atari 8-bit family, TI-99/4A, PET, VIC-20, Commodore 64, IBM PC, ZX Spectrum, BBC Micro, Acorn Electron, Dragon 32/64, and Exidy Sorcerer.