11 March 2016 - Forum Rules
Started by RetroProf, May 02, 2021, 04:05:13 AM
QuoteIt is to the ordinary Namco 108 family boards (mapper 206) as TKSROM and TLSROM (mapper 118) is to ordinary MMC3 boards. Instead of having hardwired mirroring like mapper 206, it has CHR A15 directly controlling CIRAM A10, just as CHR A17 controls CIRAM A10 on TxSROM. Only horizontal mirroring and 1-screen mirroring are possible because the Namco 108 lacks the C bit of MMC3. Disch's older notes described an extended and mistaken version of this mapper with a full MMC3, so some emulators may be doing it that way. That extended version is identical to mapper 118, except CHR A15 (bank bit 5) controls CIRAM A10 instead of CHR A17 (bank bit 7).
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