NES 2.0 Mapper 537

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NES 2.0 mapper 537 is used for the configuration of the Waixing FS303 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).

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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