INES Mapper 185: Difference between revisions

Latest revision as of 13:44, 4 February 2025

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-[[Category:iNES Mappers]]
+#REDIRECT [[CNROM]]
-  Here are Disch's original notes:
+{{DEFAULTSORT:185}}[[Category:iNES Mappers]][[Category:in NesCartDB]][[Category:Discrete logic mappers]][[Category:Nintendo licensed mappers]][[Category:NES 2.0 mappers with submappers]]
-========================
-=  Mapper 185          =
-========================
-Example Games:
---------------------------
-Spy Vs. Spy (J)
-Mighty Bomb Jack (J)
-Registers:
----------------------------
-I'm unsure whether or not this mapper suffers from bus conflicts.  I believe it does!  Use extreme caution!
-  $8000-FFFF:  [CCCC CCCC]
-     CHR Reg
-Notes:
----------------------------
-This mapper is retarded.  These games only have 8k of CHR, but they seem to attempt to disable CHR by writing
-a specific value to the CHR Reg, then they VERIFY that garbage is read back, then they swap back to the
-actual CHR.  If they don't get the expected garbage, they lock up.
-Perhaps this was some sort of copy protection?
-Each game has their own value that enables/disables CHR.  Rather than failing to attempt to list all the
-exact values used here (I don't know what all of them are), I can provide some logic:
-if C AND $0F is nonzero, and if C does not equal $13:  CHR is enabled
-otherwise CHR is disabled
-When CHR is disabled, it is as if CHR is filled with all $12's