NES 2.0 Mapper 432: Difference between revisions
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{{DEFAULTSORT:432}}[[Category:Multicart mappers]][[Category:MMC3-like mappers]][[Category:Mappers with scanline IRQs]] | {{DEFAULTSORT:432}}[[Category:Multicart mappers]][[Category:MMC3-like mappers]][[Category:Mappers with scanline IRQs]][[Category:NES 2.0 mappers with submappers]] | ||
'''NES 2.0 Mapper | '''NES 2.0 Mapper 432''' denotes a series of MMC3-based Realtec multicart circuit boards. | ||
* | * Submapper 0: Realtec 8043, 8086, 8090, GN-30C PCB | ||
* | * Submapper 1: Realtec 8023 PCB | ||
* Submapper 2: Realtec 8085 PCB | |||
* Submapper 3: Realtec 8145 PCB | |||
==Solder Pad Enable Register ($6000-$7FFE, even)== | ==Solder Pad Enable Register ($6000-$7FFE, even)== | ||
| Line 18: | Line 20: | ||
D~7654 3210 | D~7654 3210 | ||
--------- | --------- | ||
pNQP CmMb | |||
|||| |||+- PRG/CHR A17 if M=1 | |||
|||| ||+-- PRG A17 mode | |||
|||| || 0: from MMC3 (256 KiB inner bank) | |||
|||| || 1: from b (128 KiB inner bank) | |||
|||| |+--- CHR A17 mode | |||
|||| | 0: from MMC3 (256 KiB inner bank) | |||
|||| | 1: from b (128 KiB inner bank) | |||
|||| +---- CHR A18 | |||
|||+------ PRG A18 | |||
||+------- Submapper-specific functionality | |||
|| Submapper 0: PRG+CHR A19 | |||
|| Submapper 1: Read solder pad | |||
|| Submapper 2: NROM-256 mode | |||
|| Submapper 3: 512 KiB MMC3 CHR mode (like [[INES Mapper 197]] Submapper 2) | |||
|+-------- NROM-128 mode (1=enabled) | |||
+--------- Submapper 0/1: NROM-256 mode | |||
Submapper 2/3: Lock Outer Bank register | |||
As it uses the MMC3 clones's WRAM interface, writing to the outer bank register requires enabling and not write-protecting WRAM in the MMC's $A001 register. | As it uses the MMC3 clones's WRAM interface, writing to the outer bank register requires enabling and not write-protecting WRAM in the MMC's $A001 register. | ||
Latest revision as of 10:49, 22 February 2025
NES 2.0 Mapper 432 denotes a series of MMC3-based Realtec multicart circuit boards.
- Submapper 0: Realtec 8043, 8086, 8090, GN-30C PCB
- Submapper 1: Realtec 8023 PCB
- Submapper 2: Realtec 8085 PCB
- Submapper 3: Realtec 8145 PCB
Solder Pad Enable Register ($6000-$7FFE, even)
Mask: $E001
D~7654 3210
---------
.... ...S
+- 1=Replace PRG-ROM with solder pad value
in the CPU $8000-$FFFF address range
Outer Bank Register ($6001-$7FFF, odd)
Mask: $E001 D~7654 3210 --------- pNQP CmMb |||| |||+- PRG/CHR A17 if M=1 |||| ||+-- PRG A17 mode |||| || 0: from MMC3 (256 KiB inner bank) |||| || 1: from b (128 KiB inner bank) |||| |+--- CHR A17 mode |||| | 0: from MMC3 (256 KiB inner bank) |||| | 1: from b (128 KiB inner bank) |||| +---- CHR A18 |||+------ PRG A18 ||+------- Submapper-specific functionality || Submapper 0: PRG+CHR A19 || Submapper 1: Read solder pad || Submapper 2: NROM-256 mode || Submapper 3: 512 KiB MMC3 CHR mode (like INES Mapper 197 Submapper 2) |+-------- NROM-128 mode (1=enabled) +--------- Submapper 0/1: NROM-256 mode Submapper 2/3: Lock Outer Bank register
As it uses the MMC3 clones's WRAM interface, writing to the outer bank register requires enabling and not write-protecting WRAM in the MMC's $A001 register. NROM-128 mode forces the MMC3 clone's CPU A14 input low, causing MMC3 register 6 to select both the bank at $8000 and $C000, and register 7 to select both the bank at $A000 and $E000.
MMC3-compatible registers ($8000-$FFFF)
Mask: $E001
See MMC3.
