Good News! In a recent update to the MAME CPS3 driver, the developers have added a chart containing the CPS3 Video registers, including all PPU stuff and the SS RAM stuff. I must give big thanks to the MAME devs, this really helps a lot in my quest to create a homebrew SDK for the CPS3.
Now to put these in a document, create some libraries for my SH2 compiler, and dissect the CPS3 graphics format so I can test this through MAME and eventually real hardware.
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