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).