INES Mapper 180

UxROM (inverted)

Company	Nichibutsu
Games	1 in NesCartDB
Complexity	Discrete logic
Boards	UNROM
PRG ROM capacity	128K/4096K
PRG ROM window	16K fixed + 16K
PRG RAM capacity	None
CHR capacity	8K
CHR window	n/a
Nametable mirroring	Fixed H or V, controlled by solder pads
Bus conflicts	Yes
IRQ	No
Audio	No
iNES mappers	180, 002, 094

NESCartDB

iNES 180

INES Mapper 180 is used to represent an unusual configuration of the UNROM board used only for the game Crazy Climber.

Notes

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.

For a similar mapper with additional mirroring control, see iNES Mapper 097.

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]