NES 2.0 Mapper 519: Difference between revisions
From NESdev Wiki
Jump to navigationJump to search
NewRisingSun (talk | contribs) (A7 correction, additions.) |
m (defaultsort) |
||
| Line 1: | Line 1: | ||
[[Category:Multicart mappers]]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. | {{DEFAULTSORT:519}}[[Category:Multicart mappers]]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] | A~[1... ...L pDPP PPPP] D~[MCCC CCCC] | ||
Revision as of 07:02, 26 May 2020
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 (*)
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.
