nwk-tr.cpp: Revert back to one K001604 to properly show graphics during POST #13333
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Writing to two devices at the same time is not supported and will not be. It requires hardware support so funky it ends up being extremely rare and a case-by-case basis. Not something suitable to generic infrastructure. |
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I mean not supported in address maps, of course. |
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I don't even. |
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racingj and racingj2 had a problem where some portions of POST wouldn't properly show with two k001604 tilemap ICs. This is because of the hardware configured in a way so that each CG board had its own separate bit (EXID0 and EXID1) to set for a read/write. This means the main board could set both bits on for a broadcast read/write to both boards simultaneously which is exactly what racingj does before POST to initialize both k001604 registers at once.
I myself have no clue if this kind of broadcasting is supported when it comes to address maps as it would be nice to convert k001604's register area to use a memory map instead of switch case mess. Regardless, it makes more sense to revert to one k001604 as the registers initialized to both are the same by default.