NES 2.0 Mapper 516
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INES 2.0 Mapper 516 is used for the two Brilliant Com Cocoma Pack cartridges from EduBank. They consist of an MMC3 clone (AX5202P) with an additional PAL.
Registers
Inner Bank select ($8000-$800E, even)
Inner Bank data ($8001-$800F, odd)
These registers are identical to the respective MMC3 registers, except that only the four lowest PRG, and the seven lowest CHR bank bits are used; in other words, the MMC3 bank registers select only within a 128 KiB inner bank.
Outer Bank select ($8010-$801F)
The address being written to selects the outer 128 KiB PRG and CHR banks. A0 and A1 select the outer 128 KiB PRG bank, A2 and A3 select the outer 128 KiB CHR bank.
IRQ latch ($C000-$DFFE, even)
IRQ reload ($C001-$DFFF, odd)
IRQ latch ($C000-$DFFE, even)
IRQ reload ($C001-$DFFF, odd)
IRQ disable ($E000-$FFFE, even)
IRQ enable ($E001-$FFFF, odd)
These registers are identical to the respective MMC3 registers.
