INES Mapper 136: Difference between revisions
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NewRisingSun (talk | contribs) (MGC-008/MGC-010/MGC-011 use the 24-pin ASIC and should therefore pedantically be listed under 132, even as they would run under 136 as well.) |
NewRisingSun (talk | contribs) (Update link to PCB picture) |
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INES Mapper 136 is used by | INES Mapper 136 is used to denote the Sachen 3011 board, used by four early releases from Joy Van/Sachen: | ||
* ''未来小子'' (Wèilái Xiǎozi, "Joy Van Kid", original Taiwan release of ''Metal Fighter µ'' with Chinese title screen) (TC-008) | * ''未来小子'' (Wèilái Xiǎozi, "Joy Van Kid", original Taiwan release of ''Metal Fighter µ'' with Chinese title screen) (TC-008) | ||
* ''蝶變'' (Diébiàn, "Incantation", original Taiwan release of ''Galactic Crusader'' with Chinese title screen, often incorrectly rendered as Japanese "Chou Hen") (TC-009) | * ''蝶變'' (Diébiàn, "Incantation", original Taiwan release of ''Galactic Crusader'' with Chinese title screen, often incorrectly rendered as Japanese "Chou Hen") (TC-009) | ||
* ''四川麻將'' (Sìchuān Májiàng, "Mahjong Trap", original Taiwan release of ''Shisen Mahjong - Seifuku Hen'') (TC-010) | * ''四川麻將'' (Sìchuān Májiàng, "Mahjong Trap", original Taiwan release of ''Shisen Mahjong - Seifuku Hen'') (TC-010) | ||
* ''Mahjong Companion'' (alternative version, more common version use mappers [[INES Mapper 079|79]] or [[INES Mapper 139|139]] instead. | |||
==Banks== | ==Banks== | ||
* CPU $8000-$FFFF: 32 KiB switchable PRG ROM bank (only used for ''Mahjong Companion'') | |||
* PPU $0000-$1FFF: 8 KB switchable CHR ROM bank | * PPU $0000-$1FFF: 8 KB switchable CHR ROM bank | ||
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Write $8000-$FFFF: Output := Register; written value is ignored. | Write $8000-$FFFF: Output := Register; written value is ignored. | ||
In Mapper 136, bits 0/ | In Mapper 136, bits 0/2 of the 8 KiB CHR ROM bank number (CHR A13..A15) come from Output bits 0-2, and the 32 KiB PRG ROM bank number (PRG A15) comes from Output bit 4: | ||
8 KiB CHR | 8 KiB CHR ROM bank number := (Output &7); | ||
32 KiB PRG ROM bank number := (Output >>4) &1; | |||
Sachen's original '''3011''' circuit board only supported CHR ROM switching. The connection to switch 32 KiB PRG ROM was obtained by [https://datomatic.no-intro.org/attachments%20-%20sources/Nintendo%20-%20Nintendo%20Entertainment%20System/20210330_144245_3138_pcb_back.jpg soldering an additional wire/resistor]. | |||
Games will check the lower four or six bits of $4100 for the correct value after several increment and inversion operations as a copy-protection measure. | Games will check the lower four or six bits of $4100 for the correct value after several increment and inversion operations as a copy-protection measure. | ||
==Similar Mappers== | ==Similar Mappers== | ||
* Mapper 136 is almost identical to [[INES Mapper 132]] with only 32 KiB PRG-ROM except in the value read from $4100 due to Mapper 136 having four (28-pin JV001 ASIC) versus Mapper 132 having three adder bits (24-pin 05-00002-010 ASIC). | * Mapper 136 is almost identical to [[INES Mapper 132]] with only 32 KiB PRG-ROM except in the value read from $4100 due to Mapper 136 having four (28-pin JV001 ASIC) versus Mapper 132 having three adder bits (24-pin 05-00002-010 ASIC). | ||
* [[Mapper 172]] is similar to Mapper 136, connecting the six CPU bits in reverse order due to the JV001 ASIC being mounted upside down. | * [[INES Mapper 147]] expands CHR-ROM size to 128 KiB and additionally supports 128 KiB PRG-ROM, switched in 32 KiB amounts. | ||
* [[INES Mapper 172]] is similar to Mapper 136, connecting the six CPU bits in reverse order due to the JV001 ASIC being mounted upside down. | |||
==See also== | ==See also== | ||
* [http://forums.nesdev.org/viewtopic.php?f=3&t=15961&start=30#p210702 PCB image] | * [http://forums.nesdev.org/viewtopic.php?f=3&t=15961&start=30#p210702 PCB image] | ||
Latest revision as of 09:07, 16 February 2024
INES Mapper 136 is used to denote the Sachen 3011 board, used by four early releases from Joy Van/Sachen:
- 未来小子 (Wèilái Xiǎozi, "Joy Van Kid", original Taiwan release of Metal Fighter µ with Chinese title screen) (TC-008)
- 蝶變 (Diébiàn, "Incantation", original Taiwan release of Galactic Crusader with Chinese title screen, often incorrectly rendered as Japanese "Chou Hen") (TC-009)
- 四川麻將 (Sìchuān Májiàng, "Mahjong Trap", original Taiwan release of Shisen Mahjong - Seifuku Hen) (TC-010)
- Mahjong Companion (alternative version, more common version use mappers 79 or 139 instead.
Banks
- CPU $8000-$FFFF: 32 KiB switchable PRG ROM bank (only used for Mahjong Companion)
- PPU $0000-$1FFF: 8 KB switchable CHR ROM bank
Registers
Mapper 136 uses a custom IC (real number "JV001", fake marking "GS63030-A") serving as a latch, adder and inverter. There are five registers: Input (6 bits), Output (6 bits), Register (6 bits), Mode (1 bit) and Invert (1 bit).
Mask: $E103
Read $4100-$4103: [..RR RRRR]: Read Register. Bits 4-5 are inverted if Invert==1. Bits 6-7 are open bus.
Write $4100: When Mode==0: Bits 0-5 of Register := Input, bits 0-3 being inverted if Invert==1.
When Mode==1: Bits 0-3 of Register incremented by one, bits 4-5 unaffected.
Write $4101: Invert := Written value bit 0.
Write $4102: Input := Written value bits 0-5.
Write $4103: Mode := Written value bit 0.
Write $8000-$FFFF: Output := Register; written value is ignored.
In Mapper 136, bits 0/2 of the 8 KiB CHR ROM bank number (CHR A13..A15) come from Output bits 0-2, and the 32 KiB PRG ROM bank number (PRG A15) comes from Output bit 4:
8 KiB CHR ROM bank number := (Output &7); 32 KiB PRG ROM bank number := (Output >>4) &1;
Sachen's original 3011 circuit board only supported CHR ROM switching. The connection to switch 32 KiB PRG ROM was obtained by soldering an additional wire/resistor.
Games will check the lower four or six bits of $4100 for the correct value after several increment and inversion operations as a copy-protection measure.
Similar Mappers
- Mapper 136 is almost identical to INES Mapper 132 with only 32 KiB PRG-ROM except in the value read from $4100 due to Mapper 136 having four (28-pin JV001 ASIC) versus Mapper 132 having three adder bits (24-pin 05-00002-010 ASIC).
- INES Mapper 147 expands CHR-ROM size to 128 KiB and additionally supports 128 KiB PRG-ROM, switched in 32 KiB amounts.
- INES Mapper 172 is similar to Mapper 136, connecting the six CPU bits in reverse order due to the JV001 ASIC being mounted upside down.
