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Fantasy computers are computer that are ‘inspired’ by real computers. Means their name sound like ZX81 > Tic80 but of course they are fast, programmable with lua and in the most of the cases have all integrated: spriteeditor, tile/background-editor, soundeffects editor and music editor. So they are really the dream of an 8bit-coder* with assembler, low memory, low graphics, no tools.