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| The '''Namco 129''' and '''163''' with expansion sound are assigned to [[INES Mapper 019|iNES Mapper 19]], while simpler variants using the Namco '''175''' and '''340''' ICs have simpler mirroring and are assigned to [[iNES Mapper 210]]. All four were packaged in [[Namcot 163 family pinout|48-pin TQFPs]].
| | #REDIRECT [[INES Mapper 019]] |
| | | [[Category:Mappers with CHR ROM and CHR RAM]][[Category:Mappers using $4020-$5FFF]][[Category:ASIC mappers]][[Category:Mappers with ROM nametables]][[Category:Mappers with cycle IRQs]][[Category:Mappers with single-screen mirroring]] |
| Many older programs incorrectly identify this mapper by the name '''Namco 106'''. Some sources use the name Namcot instead of Namco, as some games and PCBs use this variation on the company name.
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| == Overview ==
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| * PRG ROM size: Up to 512 KB
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| * PRG ROM bank size: 8 KB
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| * PRG RAM: Up to 8 KB
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| * CHR capacity: Up to 256 KB ROM (and/or 32 KB RAM simultaneously?) [[Category:Mappers with CHR RAM]]
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| * CHR bank size: 1 KB
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| * Nametable [[mirroring]]: Controlled by mapper (Mapper 19), hardwired (Mapper 210)
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| * Subject to [[bus conflict]]s: No
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| == Banks ==
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| * CPU $6000-$7FFF: 8 KB PRG RAM bank
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| * CPU $8000-$9FFF: 8 KB switchable PRG ROM bank
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| * CPU $A000-$BFFF: 8 KB switchable PRG ROM bank
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| * CPU $C000-$DFFF: 8 KB switchable PRG ROM bank
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| * CPU $E000-$FFFF: 8 KB PRG ROM bank, fixed to the last bank
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| * PPU $0000-$03FF: 1 KB switchable CHR bank
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| * PPU $0400-$07FF: 1 KB switchable CHR bank
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| * PPU $0800-$0BFF: 1 KB switchable CHR bank
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| * PPU $0C00-$0FFF: 1 KB switchable CHR bank
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| * PPU $1000-$13FF: 1 KB switchable CHR bank
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| * PPU $1400-$17FF: 1 KB switchable CHR bank
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| * PPU $1800-$1BFF: 1 KB switchable CHR bank
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| * PPU $1C00-$1FFF: 1 KB switchable CHR bank
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| * PPU $2000-$23FF: 1 KB switchable CHR bank
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| * PPU $2400-$27FF: 1 KB switchable CHR bank
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| * PPU $2800-$2BFF: 1 KB switchable CHR bank
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| * PPU $2C00-$2FFF: 1 KB switchable CHR bank
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| == Registers ==
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| The 163 has 19 registers within $4800-$5FFF and $8000-$FFFF, while the the 175 and 340 only have 12. Each register occupies a range of $800 bytes, so $4800-$4FFF all refers to one register, $5000-$57FF all refers to another register, and so on.
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| === Sound Data Port ($4800-$4FFF) r/w (Namco 129,163 only) ===
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| See [[Namco 163 audio]].
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| === IRQ Counter (low) ($5000-$57FF) r/w (Namco 129,163 only) ===
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| 7 bit 0
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| ---- ----
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| IIII IIII
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| |||| ||||
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| ++++-++++- Low 8 bits of IRQ counter
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| === IRQ Counter (high) / IRQ Enable ($5800-$5FFF) r/w (Namco 129,163 only) ===
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| 7 bit 0
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| ---- ----
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| EIII IIII
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| |||| ||||
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| |+++-++++- High 7 bits of IRQ counter
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| +--------- IRQ Enable: (0: disabled; 1: enabled)
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| === CHR and NT Select ($8000-$DFFF) w ===
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| {| class="wikitable"
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| ! Value CPU writes !! Behavior
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| |-
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| | $00-$DF || Always selects 1KB page of CHR-ROM
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| |-
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| | $E0-$FF || If enabled by bit in $E800 and using a N163 or N129, use the NES's internal nametables (even values for A, odd values for B)
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| |}
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| {| class="wikitable"
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| ! Write to CPU address !! 1KB CHR bank affected !! Values ≥ $E0 denote NES NTRAM if
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| |-
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| | $8000-$87FF || $0000-$03FF || $E800.6 = 0
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| |-
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| | $8800-$8FFF || $0400-$07FF || $E800.6 = 0
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| |-
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| | $9000-$97FF || $0800-$0BFF || $E800.6 = 0
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| |-
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| | $9800-$9FFF || $0C00-$0FFF || $E800.6 = 0
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| |-
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| | $A000-$A7FF || $1000-$13FF || $E800.7 = 0
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| |-
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| | $A800-$AFFF || $1400-$17FF || $E800.7 = 0
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| |-
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| | $B000-$B7FF || $1800-$1BFF || $E800.7 = 0
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| |-
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| | $B800-$BFFF || $1C00-$1FFF || $E800.7 = 0
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| |-
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| | $C000-$C7FF || $2000-$23FF || always
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| |-
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| | $C800-$CFFF || $2400-$27FF || always
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| |-
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| | $D000-$D7FF || $2800-$2BFF || always
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| |-
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| | $D800-$DFFF || $2C00-$2FFF || always
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| |}
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| '''Note:''' With mapper 210, a.k.a. Namco 175 or 340, the nametable selection registers have no effect, and nametable RAM cannot be used as CHR-RAM.
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| It is believed, but untested, that a game could add a normal SRAM and use it instead of the nametable RAM; if so, a game would be able to get 4-screen mirroring and many more pages of CHR-RAM.
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| === External PRG RAM enable ($C000-$C7FF) w (Namco 175 only) ===
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| 7 bit 0
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| ---- ----
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| .... ...E
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| +- 1: Enable PRG RAM
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| === PRG Select 1 ($E000-$E7FF) w ===
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| 7 bit 0
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| ---- ----
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| MMPP PPPP
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| |||| ||||
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| ||++-++++- Select 8KB page of PRG-ROM at $8000
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| |+-------- Namco 129, 163 only: Disable sound if set
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| ++-------- Namco 340 only: Select mirroring
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| 0: One-screen A
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| 1: Vertical
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| 2: Horizontal
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| 3: One-screen B
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| === PRG Select 2 / CHR-RAM Enable ($E800-$EFFF) w ===
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| 7 bit 0
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| ---- ----
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| HLPP PPPP
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| |||| ||||
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| ||++-++++- Select 8KB page of PRG-ROM at $A000
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| |+-------- Disable CHR-RAM at $0000-$0FFF (Namco 129, 163 only)
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| | 0: Pages $E0-$FF use NT RAM as CHR-RAM
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| | 1: Pages $E0-$FF are the last $20 banks of CHR-ROM
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| +--------- Disable CHR-RAM at $1000-$1FFF (Namco 129, 163 only)
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| 0: Pages $E0-$FF use NT RAM as CHR-RAM
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| 1: Pages $E0-$FF are the last $20 banks of CHR-ROM
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| === PRG Select 3 ($F000-$F7FF) w ===
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| 7 bit 0
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| ---- ----
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| ..PP PPPP
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| || ||||
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| ++-++++- Select 8KB page of PRG-ROM at $C000
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| === Write Protect for External RAM AND Sound Address Port ($F800-$FFFF) w (Namco 129, 163 only) ===
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| 7 bit 0
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| ---- ----
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| KKKK DCBA
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| |||| ||||
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| |||| |||+- 1: Write-protect 2kB window of external RAM from $6000-$67FF (0: write enable)
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| |||| ||+-- 1: Write-protect 2kB window of external RAM from $6800-$6FFF (0: write enable)
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| |||| |+--- 1: Write-protect 2kB window of external RAM from $7000-$77FF (0: write enable)
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| |||| +---- 1: Write-protect 2kB window of external RAM from $7800-$7FFF (0: write enable)
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| ++++------ Additionally the upper nybble must be equal to b0100 to enable writes
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| Any value outside of the range $40-$4E will cause all PRG RAM to be read-only.
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| Also see [[Namco 163 audio]].
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| == IRQ Operation ==
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| The IRQ is a 15-bit CPU cycle up-counter. $5000 and $5800 provide ''direct'' access to the counter itself (i.e., this isn't a reload value). Games can read and write to these registers in realtime.
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| The IRQ counter increments on each CPU cycle. Upon reaching $7FFF, an IRQ is fired, and it stops counting. Writing to $5000 or $5800 will acknowledge any pending IRQs.
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| == See also ==
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| *[http://nesdev.org/namco106.txt Namcot 106] by goroh, fix by ZW4 and nori, english translation by nori.
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| All of the below are in Japanese:
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| *[http://forums.nesdev.org/viewtopic.php?p=77795#77795 Naruko's post to the forum]
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| *[http://unagi.sourceforge.jp/cgi-bin/hiki/hiki.cgi?163_namco Wiki on same]
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| *[http://d.hatena.ne.jp/na6ko/20110501/1304181038 Naruko's blog's post on mirroring on the 340]
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| *[http://d.hatena.ne.jp/na6ko/20110430/1304099059 Naruko's blog's post on the write protect register at $F800]
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| [[Category:Mappers using $4020-$5FFF]][[Category:ASIC mappers]][[Category:Mappers with ROM nametables]] | |
