NES 2.0 Mapper 339: Difference between revisions
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NewRisingSun (talk | contribs) (Created page with "Category:Multicart mappersCategory:MMC3-like mappersCategory:Mappers with scanline IRQs NES 2.0 mapper 339 is used for a ''21-in-1'' multicart. Its UNIF board name...") |
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[[Category:Multicart mappers]][[Category:MMC3-like mappers]][[Category:Mappers with scanline IRQs]] | {{DEFAULTSORT:339}}[[Category:Multicart mappers]][[Category:MMC3-like mappers]][[Category:Mappers with scanline IRQs]] | ||
NES 2.0 mapper 339 is used for a ''21-in-1'' multicart. Its UNIF board name is '''BMC-K-3006'''. | NES 2.0 mapper 339 is used for a ''21-in-1'' multicart. Its UNIF board name is '''BMC-K-3006'''. | ||
Latest revision as of 06:55, 26 May 2020
NES 2.0 mapper 339 is used for a 21-in-1 multicart. Its UNIF board name is BMC-K-3006.
Outer Bank and Mode Register ($6000-$7FFF, write)
Mask: $E000
A~FEDC BA98 7654 3210
-------------------
0110 .... ..PO OIIi
|| |+++- Select 16 KiB inner PRG-ROM bank at CPU $8000-$BFFF and
|| | $C000-$FFFF (NROM-128) if P=0.
|| | If P=0 and II=6, i is replaced with CPU A14 (NROM-256).
|+-+---- Select 128 KiB outer PRG-ROM and CHR-ROM bank
+------- Select PRG banking mode
0: NROM, use OO and IIi bits
1: MMC3, use only OO bits
As it uses the MMC3 clones's WRAM interface, writing to the Outer Bank register requires enabling and not write-protecting WRAM in the MMC's $A001 register.
MMC3-compatible registers
Mask: $E001 See MMC3.
