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VICE is an emulator collection which emulates the C64, the C64-DTV, the C128, the VIC20, practically all PET models, the PLUS4 and the CBM-II (aka C610). It runs on Unix, MS-DOS, Win32, OS/2, Acorn RISC OS, BeOS, QNX 6.x, Amiga, GP2X or Mac OS X machines.
...It supports virtually any emulator for any system and has versatile database searching and filtering. There are databases for Apple II, Atari ST, Coleco ColecoVision, Commodore Amiga, Commodore C64, Commodore VIC20, Nintendo NES, Nintendo SNES, and Sinclair ZXSpectrum.
xrockman is a retro arcade/puzzle game based on Rockman for the VIC20 by M & S Srebalius and published by Mastertronic in the 1980s. xrockman is written for Xlib so requires little in the way of dependencies and runs on slow computers