Contents Introduction This is a near-complete analysis and tear-down of the Casio ROM Pack code. By the end of the document, you should be able to create your own, fully playable Casio ROM files. All the examples in this document are either from RO-551 “World Songs” or RO-270 “Christmas”. RO-551 is by far the most…

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Introduction Greetings retro Casio keyboard fans! Late one night, in December of 2020, I found myself wondering how the ROM packs from my beloved old Casio PT-80 worked. It seemed no one knew–and at the time, apparently only one ROM had been dumped. I had just started vacation and decided it would be excellent vacation…

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