NES 2.0 Mapper 460

NES 2.0 Mapper 460 denotes the FC-29-40 and K-3101 MMC3–based multicart circuit boards, used by the 13-in-1 實實在在的好朋友快打的超値感受 and Street Fighter III 40-in-1 - Games Screen Selectable multicarts. Mounting both 512 KiB of CHR ROM and 8 KiB of CHR RAM, they combine the functionalities of INES Mapper 197 with NROM-based 32 KiB banking.

Extra Register ($6000-$7FFF, write)

Mask: $E000

A~[011. .... S.NM .CBB]
             | ||  |++- PRG A18..A17
             | ||  +--- 0: 8 KiB of unbanked CHR RAM
             | ||       1: 512 KiB of CHR ROM
             | ++------ PRG ROM banking mode
             |          0x: MMC3
             |          10: NROM-128
             |          11: NROM-256
             +--------- 1: Disable PRG ROM if solder pad connected

Value on reset: $00

Notes

WRAM must be enabled in $A001.7 before writing to the extra register.
NROM mode causes the MMC3’s CPU A14 line to be held low, making the MMC3’s two PRG registers apply to both $8000/$A000 and $C000/$E000.
NROM-256 mode additionally replaces PRG A14 with CPU A14.
512 KiB of CHR ROM is realized by connecting the MMC3 clone according to mapper 197.2.
Connecting the solder pad or not selects between two menus (20-in-1 and 40-in-1).

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