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| [[Category:iNES Mappers]] | | #REDIRECT [[VRC1]] |
| | | [[Category:iNES Mappers|075]][[Category:in NesCartDB|075]] |
| [[iNES Mapper 075]] is used to represent the [[Konami VRC1]] mapper. | |
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| Here are Disch's original notes:
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| ========================
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| = Mapper 075 =
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| ========================
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|
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|
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| aka:
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| --------------------------
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| VRC1
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|
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|
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| Example Games:
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| --------------------------
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| Tetsuwan Atom
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| Ganbare Goemon! - Karakuri Douchuu
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|
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| Registers:
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| --------------------------
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|
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| Range,Mask: $8000-FFFF, $F000
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|
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| $8000: [.... PPPP] PRG Reg 0 (8k @ $8000)
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| $A000: [.... PPPP] PRG Reg 1 (8k @ $A000)
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| $C000: [.... PPPP] PRG Reg 2 (8k @ $C000)
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|
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| $9000: [.... .BAM] Mirroring, CHR reg high bits
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| M = Mirroring (0=Vert, 1=Horz)
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| A = High bit of CHR Reg 0
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| B = High bit of CHR Reg 1
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|
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| $E000: [.... CCCC] Low 4 bits of CHR Reg 0 (4k @ $0000)
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| $F000: [.... CCCC] Low 4 bits of CHR Reg 1 (4k @ $1000)
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| PRG Setup:
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| ---------------------------
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| $8000 $A000 $C000 $E000
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| +-------+-------+-------+-------+
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| | $8000 | $A000 | $C000 | { -1} |
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| +-------+-------+-------+-------+
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|
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| CHR Setup:
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| ---------------------------
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|
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| CHR regs are 5 bits wide. The low 4 bits of each reg are set by $E000 and $F000, and the high bit is taken
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| from the appropriate bits of $9000.
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| $0000 $0400 $0800 $0C00 $1000 $1400 $1800 $1C00
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| +-------------------------------+-------------------------------+
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| | $9000.1 + $E000 | $9000.2 + $F000 |
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| +-------------------------------+-------------------------------+
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