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mapper updates #106
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mapper updates #106
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- Add support for submapper 3 variant - Add support for submapper 4 variant - Add support for submapper 5 - Fix submapper 2 support for 64 MB multicarts - Prevent other submappers from overriding _prgBaseBits - Set one-screen mirroring only for Submapper 2 - Fix CNROM latch for Submapper 1/5. Move its enable bit to correct register.
Both are variants of Mapper 176
With the recent changes to Fk23C.h, a NES 2.0 header is very much near necessary to set variables not found on iNES 1.0 header like submappers and the availability of a switchable CHR-RAM/CHR-ROM in some. UNIF boards do not support submapper in header but most of the romsets in Fk23C/Fk23CA i found are already in the database. This PR covers only the few roms which are not in database.
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