NES 2.0 Mapper 267: Difference between revisions
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==MMC3-compatible registers== | ==MMC3-compatible registers== | ||
Mask: $ | Mask: $E001 | ||
* $8000, $8001, $A000, $A001, $C000, $C001, $E000, $E001: As normal [[MMC3]]. Inner PRG banks are limited to 256 KiB, Inner CHR banks to 128 KiB. | * $8000, $8001, $A000, $A001, $C000, $C001, $E000, $E001: As normal [[MMC3]]. Inner PRG banks are limited to 256 KiB, Inner CHR banks to 128 KiB. | ||
Revision as of 20:43, 31 March 2018
NES 2.0 Mapper 267 is used for the 8-in-1 JY-119 multicart. It consists of an MMC3 clone with an outer bank register at $6000.
MMC3-compatible registers
Mask: $E001
- $8000, $8001, $A000, $A001, $C000, $C001, $E000, $E001: As normal MMC3. Inner PRG banks are limited to 256 KiB, Inner CHR banks to 128 KiB.
Outer Bank ($6000)
Mask: Unknown
7654 3210 ---- ---- UUB. .BB. ||+---++-- Select 256 KiB outer PRG-ROM and 128 KiB outer CHR-ROM bank ++-------- Unknown, cleared when the menu is shown, both set once a game has been selected.
Notes
- The initial value of this register must be $00 for the multicart menu to be shown.
- The cart seems to run just fine when ignoring the two unknown bits.
