NES 2.0 Mapper 529: Difference between revisions
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{{DEFAULTSORT:529}}[[Category:Mappers with cycle IRQs]]'''NES 2.0 Mapper 529''' denotes the '''YY0807''', '''J-2148''' and '''T-230''' PCBs, used for particular bootlegs version of ''Datach Dragon Ball Z'' ('''T-230''' PCB, with CHR-RAM) and ''Dragon Ball Z Gaiden'' (''' | {{DEFAULTSORT:529}}[[Category:Mappers with cycle IRQs]]'''NES 2.0 Mapper 529''' denotes the '''YY0807''', '''J-2148''' and '''T-230''' PCBs, used for particular bootlegs version of ''Datach Dragon Ball Z'' ('''T-230''' PCB, with CHR-RAM) and ''Dragon Ball Z Gaiden'' ('''YY0807'''/'''J-2148''' PCBs, with CHR-ROM). It's a [[VRC4]] clone (A2/A3, VRC4e) connected such that the $800x register has no effect, and the $A00x register selects a 16 KiB PRG-ROM bank, similar to the games' original Bandai mappers. Its UNIF board name is '''UNL-T-230'''. | ||
Similarly to the Bandai mappers, it also supports saving data to serial EEPROM. The presence of EEPROM is denoted via the NES 2.0 header's PRG-NVRAM field indicating 256 byte of non-volatile save data. Unlike the original Bandai FCG boards that used an I²C interface, the bootleg variants use a 93C56 EEPROM via a Microwire interface, operated using the following registers: | Similarly to the Bandai mappers, it also supports saving data to serial EEPROM. The presence of EEPROM is denoted via the NES 2.0 header's PRG-NVRAM field indicating 256 byte of non-volatile save data. Unlike the original Bandai FCG boards that used an I²C interface, the bootleg variants use a 93C56 EEPROM via a Microwire interface, operated using the following registers: | ||
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The 93C56's EEPROM's org pin is tied to Vcc, indicating a 16-bit word length. | The 93C56's EEPROM's org pin is tied to Vcc, indicating a 16-bit word length. | ||
See also: [https://forums.nesdev.org/viewtopic.php?p=243032 Board pictures and circuit diagrams] | |||
Revision as of 23:56, 19 February 2022
NES 2.0 Mapper 529 denotes the YY0807, J-2148 and T-230 PCBs, used for particular bootlegs version of Datach Dragon Ball Z (T-230 PCB, with CHR-RAM) and Dragon Ball Z Gaiden (YY0807/J-2148 PCBs, with CHR-ROM). It's a VRC4 clone (A2/A3, VRC4e) connected such that the $800x register has no effect, and the $A00x register selects a 16 KiB PRG-ROM bank, similar to the games' original Bandai mappers. Its UNIF board name is UNL-T-230.
Similarly to the Bandai mappers, it also supports saving data to serial EEPROM. The presence of EEPROM is denoted via the NES 2.0 header's PRG-NVRAM field indicating 256 byte of non-volatile save data. Unlike the original Bandai FCG boards that used an I²C interface, the bootleg variants use a 93C56 EEPROM via a Microwire interface, operated using the following registers:
Read Microwire Interface ($5000, read)
Mask: $F000
D~[.... ...D]
+- Serial Data Output from the 93C56 EEPROM
Write Microwrite Interface ($8800, write)
Mask: $8800
D~[.... .ECD]
||+- Serial Data Input to 93C56 EEPROM
|+-- Serial Clock to 93C56 EEPROM
+--- Chip Select to 93C56 EEPROM
This register's address range overrides the VRC4's. The game writes to the $FFFx address range to operate this register.
The 93C56's EEPROM's org pin is tied to Vcc, indicating a 16-bit word length.
See also: Board pictures and circuit diagrams
