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| {{DEFAULTSORT:537}}[[Category:MMC3 with CHR ROM and CHR RAM|537]][[Category:Mappers with scanline IRQs|537]][[Category:MMC3-like mappers|537]]
| | #REDIRECT [[INES Mapper 195]] |
| NES 2.0 mapper 537 is used for the configuration of the Waixing [[:File:DuShenFront-cropped.jpg|FS303]] [[:File:DuShenBack-cropped.jpg|board]] used for the unmodified ROM images of ''足球小将'' and ''天使之翼 2'', Waixing's Chinese translations of the Tecmo game ''Captain Tsubasa 2''. In this configuration, the GAL chip causes [[MMC3]] CHR banks '''$00-$03''' and '''$28-$2B''' to be routed to the same four CHR-RAM pages instead of CHR-ROM, but *only* while PPU A12 is low (i.e. only for PPU $0000-$0FFF).
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| During the protection check that occurs after the Waixing logo, the game writes CHR-RAM data to CHR banks $00-$03, expects to be able to read back the same data via CHR $28-$2B, and deliberately freezes if the content does not match. ROM images that work as [[INES Mapper 195]] have been modified to read back the CHR-RAM data from $00-$03 during the protection check.
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