Difference between revisions of "NES 2.0 Mapper 519"

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             |                            1: NROM-128 (16 KiB, $8000-$BFFF mirrored at $C000-$FFFF)
 
             |                            1: NROM-128 (16 KiB, $8000-$BFFF mirrored at $C000-$FFFF)
 
             +-------------------------- 1=Lock all fields marked (*)
 
             +-------------------------- 1=Lock all fields marked (*)
 
[[iNES Mapper 227]] appears to also have the same "DIP switch" that can override LSBs of address so that the multicart can detect which variant it's pretending to be.
 

Latest revision as of 05:19, 5 April 2021

NES 2.0 Mapper 519 is used for Chinese-language multicarts designated by the UNIF board name UNL-EH8813A. It latches both the CPU address and data buses.

A~[1... ...L pDPP PPPP] D~[MCCC CCCC]
           | |||| ||||     |||| ||++-- Select Inner 8 KiB CHR-ROM bank at PPU $0000-$1FFF
           | |||| ||||     |+++-++---- Select Outer 32 KiB CHR-ROM bank at PPU $0000-$1FFF (*)
           | |||| ||||     +---------- Select Nametable mirroring type (0=Vertical, 1=Horizontal) (*)
           | ||++-++++---------------- Select 16 KiB PRG-ROM bank at CPU $8000-$BFFF/$C000-$FFFF (*)
           | |+----------------------- Read DIP switch mode (*)
           | |                           0: Disabled, reads from $8000-$FFFF normal
           | |                           1: Enabled, when reading from $8000-$FFFF:
           | |                               Bitwise AND address with $FFF0 and OR with the DIP switch setting ($0-$F)
           | +------------------------ PRG-ROM banking mode (*)
           |                             0: NROM-256 (32 KiB, bit 0 ignored)
           |                             1: NROM-128 (16 KiB, $8000-$BFFF mirrored at $C000-$FFFF)
           +-------------------------- 1=Lock all fields marked (*)