View source for INES Mapper 180

[[INES Mapper 180]] is used to represent a simple Nichibutsu board, its specific type name is unknown. ''Crazy Climber'' is the only game known to utilize this mapper. It is similar to [[UxROM]] but uses AND logic ([[7408|74HC08]]) instead of OR logic ([[7432|74HC32]]), producing a fixed first bank at $8000 rather than a fixed last bank at $C000.

Because [[APU DMC]] is usually restricted to $C000-$FFFF, this behavior might be useful for games with a lot of recorded speech.
But like [[BNROM]] and [[AxROM]], this configuration requires the 6502's vectors to sit in the last few bytes of each bank.

== Overview ==
* PRG ROM size: 128 KB
* PRG ROM bank size: 16 KB
* PRG RAM: None
* CHR capacity: 8 KB RAM [[Category:Mappers with CHR RAM]]
* CHR bank size: Not bankswitched
* Nametable [[mirroring]]: Solder pads select vertical or horizontal mirroring
* Subject to [[bus conflict]]s: ?

== Banks ==
* CPU $8000-$BFFF: 16 KB PRG ROM bank, fixed to the first bank
* CPU $C000-$FFFF: 16 KB switchable PRG ROM bank

== Registers ==
=== Bank select ($8000-$FFFF) ===
 7  bit  0
 ---- ----
 xxxx xPPP
       |||
       +++-- Select 16 KB PRG ROM bank for CPU $C000-$FFFF

[[Category:iNES Mappers]]