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Get familiarized with the tools and mindset required in order to add your own custom graphics to video arcade games and home console games. This slide deck describes exactly how to modify the graphics in Midway's "Tapper" game from 1983, running on the MCR-III hardware platform, so you can substitute the prominent branding throughout the game with something else.
Through a hex editor, you will see how game artwork tiles are laid out in the game's ROM, plus how color information in each tile is encoded. Plus, learn enough about the MAME debugger to step through the code and modify the checksum when you make significant changes to the ROMs, and discover quick tips in the GIMP photo manipulation tool that will help you scale down your art to fit beautifully into the game's tiny resolution and minimal color palette.
The concepts presented here apply (in varying degrees) to modifying games for other arcade and home console systems, particularly from the 1980s and 90s.