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Ever got a pcb that displayed its texts in Japanese instead of English - or even worse, completely refused to run because of some stupid region protection thingy? Also, did you know that some games (such as US version of ThunderCross and Lightning Fighters) are missing extra weapons and stuff when compared to their Japanese counterparts? You can often remedy the situation easily by replacing some of the (ep)rom chips on the board.

From these pages you can find ROM structure information for 5081 different arcade boards. By inspecting the ROM information and your PCB, it is really easy to figure out which chips to replace and what kind of chips to use when replacing the originals.

Just click the starting letter of the game whose ROMs you are interesteed in to proceed.

There are couple of things to keep in mind when patching PCBs: