INES Mapper 180: Difference between revisions
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[[INES Mapper 180]] is used to represent a reconfiguration of the [[UxROM|UNROM]] board used only for the game ''Crazy Climber''. It is similar in principle to the more common [[INES Mapper 002]] configuration 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. | [[INES Mapper 180]] is used to represent a reconfiguration of the [[UxROM|UNROM]] board used only for the game ''Crazy Climber''. It is similar in principle to the more common [[INES Mapper 002]] configuration 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. | ||
Crazy Climber had a special "climber stick" add-on that mounted a stick on top of the Famicom's directional pad. | |||
Because [[APU DMC]] is usually restricted to $C000-$FFFF, this behavior might be useful for games with a lot of recorded speech. | Because [[APU DMC]] is usually restricted to $C000-$FFFF, this behavior might be useful for games with a lot of recorded speech. | ||
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* [[UxROM]] | * [[UxROM]] | ||
* [[Programming UNROM]] | * [[Programming UNROM]] | ||
* NES mapper list by | * NES mapper list by Disch [http://www.romhacking.net/documents/362/] | ||
Revision as of 18:49, 22 April 2015
INES Mapper 180 is used to represent a reconfiguration of the UNROM board used only for the game Crazy Climber. It is similar in principle to the more common INES Mapper 002 configuration but uses AND logic (74HC08) instead of OR logic (74HC32), producing a fixed first bank at $8000 rather than a fixed last bank at $C000.
Crazy Climber had a special "climber stick" add-on that mounted a stick on top of the Famicom's directional pad.
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.
Mapper 97 adds mapper-selectable 1sc/H/V mirroring (and changes the fixed bank).
Overview
- PRG ROM size: 128 KB
- PRG ROM bank size: 16 KB
- PRG RAM: None
- CHR capacity: 8 KB RAM
- CHR bank size: Not bankswitched
- Nametable mirroring: Solder pads select vertical or horizontal mirroring
- Subject to bus conflicts: Yes
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
See also
- UxROM
- Programming UNROM
- NES mapper list by Disch [1]
