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| [[Category:iNES Mappers]] | | #REDIRECT [[CNROM]] |
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| '''iNES Mapper 003''' is used to designate the [[CNROM]] board and a very similar board used for Panesian games, generalized to support up to 255 banks (2040 KiB) of CHR ROM.
| | {{DEFAULTSORT:003}} |
| | | [[Category:iNES Mappers]] [[Category:in NesCartDB]] [[Category:CNROM-like mappers]] [[Category:Nintendo licensed mappers]] [[Category:Expansion audio]][[Category:NES 2.0 mappers with submappers]] |
| In May 2012, the [[NROM-368|CNROM-368]] extension was proposed, allowing 46 KB PRG ROM.
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| Here are Disch's original notes:
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| ========================
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| = Mapper 003 =
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| ========================
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| aka
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| --------------------------
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| CNROM (and compatible)
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| Example Games:
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| --------------------------
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| Solomon's Key
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| Arkanoid
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| Arkista's Ring
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| Bump 'n' Jump
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| Cybernoid
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| Registers (**BUS CONFLICTS** sometimes):
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| --------------------------
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| $8000-FFFF: [CCCC CCCC]
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| CHR Reg (selects 8k @ $0000)
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| Notes:
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| ---------------------------
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| CNROM has bus conflicts, however mapper 003 is meant to be CNROM and compatible. So some mappers which were
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| similar in function, but did not have bus conflicts are included.
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| Additionally, CNROM's reg is only 2 bits wide... therefore it is capped at 32k CHR.
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| So to be "safe":
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| - for homebrewing: assume bus conflicts, do not exceed 32k CHR
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| - for emudev: assume no bus conflicts, use all 8 reg bits
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| There is no PRG swapping.
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| The game Cybernoid seems to behave very strangely. It uses unprepped system RAM... and it is as if it
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| actually relies on bus conflicts (AND written value with value read from address)!
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