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| [[Category:iNES Mappers]] | | #REDIRECT [[VRC7]] |
| | | {{DEFAULTSORT:085}}[[Category:iNES Mappers]][[Category:in NesCartDB]][[Category:Mappers with cycle IRQs]] |
| [[iNES Mapper 085]] is used to represent the Konami [[VRC7]] mapper. | |
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| Here are Disch's original notes:
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| ========================
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| = Mapper 085 =
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| ========================
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|
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| aka
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| --------------------------
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| VRC7
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|
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|
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| Example Games:
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| --------------------------
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| Lagrange Point
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| Tiny Toon Adventures 2 (J)
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|
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|
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|
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| VRC7a vs. VRC7b
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| --------------------------
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| Lagrange Point ('VRC7a') and Tiny Toon Adventures 2 ('VRC7b') both operate exactly the same, but are wired a
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| bit differently. VRC7a uses $x010 for regs, and VRC7b uses $x008. Registers below are listed as they exist
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| on VRC7a. For VRC7b, make the appropriate adjustments
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|
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| Also, only Lagrange Point seems to use the extra sound. It's unknown whether or not the sound hardware
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| exists on VRC7b, as Tiny Toon doesn't use it.
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|
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|
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| CHR-RAM note:
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| --------------------------
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| Lagrange Point, for some reason I still don't understand, swaps its 8k CHR-RAM around. How this offers any
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| functionality is beyond me, but the game does it, so your emu must support it.
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|
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|
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|
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| Registers:
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| --------------------------
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|
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| $8000: PRG Reg 0 (8k @ $8000)
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| $8010: PRG Reg 1 (8k @ $A000)
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| $9000: PRG Reg 2 (8k @ $C000)
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|
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| $9010: Sound Address Reg (see below)
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| $9030: Sound Data Port (see below)
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|
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| $A000-$D010: CHR Regs
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|
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| $E000: [.... ..MM] Mirroring:
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| %00 = Vert
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| %01 = Horz
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| %10 = 1ScA
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| %11 = 1ScB
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|
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| $E010: [IIII IIII] IRQ Reload value
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| $F000: [.... .MEA] IRQ Control
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| $F010: [.... ....] IRQ Acknowledge
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|
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|
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| PRG Setup:
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| --------------------------
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|
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| $8000 $A000 $C000 $E000
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| +-------+-------+-------+-------+
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| | $8000 | $8010 | $9000 | { -1} |
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| +-------+-------+-------+-------+
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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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| $0000 $0400 $0800 $0C00 $1000 $1400 $1800 $1C00
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| +-------+-------+-------+-------+-------+-------+-------+-------+
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| | $A000 | $A010 | $B000 | $B010 | $C000 | $C010 | $D000 | $D010 |
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| +-------+-------+-------+-------+-------+-------+-------+-------+
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|
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|
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| IRQs:
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| --------------------------
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|
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| VRC7 uses the "VRC IRQ" setup shared by several VRCs. It uses the following registers:
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|
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|
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| $E010: [IIII IIII] IRQ Reload
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| $F000: [.... .MEA] IRQ Control
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| $F010: [.... ....] IRQ Acknowledge
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|
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| For info on how these IRQs work, see the "VRC IRQs" section in mapper 021
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|
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|
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|
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| Sound:
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| --------------------------
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|
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| VRC7 has additional sound channels! It is a slightly dumbed down version of the YM2413 (aka OPLL). There
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| are only 6 harmony channels and no rhythmic channels. Note that some older docs claim it's an OPL2 -- but it
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| is, in fact, OPLL.
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|
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| Due to the complexity of FM-synth ... details will not be covered here. For details, refer to a YM2413 data
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| sheet or technical doc.
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|
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| $9010 is the address port
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| $9030 is the data port
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|
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| They behave just like the address/data ports on the YM2413. Though remember that there's no rhythm, and
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| only 6 channels.
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|
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| Channels can choose from 16 instruments. One is customizable by the game, the other 15 are fixed with the
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| following values:
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|
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| {
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| 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // custom instrument
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|
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| 0x03,0x21,0x04,0x06,0x8D,0xF2,0x42,0x17, // begin fixed instruments
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| 0x13,0x41,0x05,0x0E,0x99,0x96,0x63,0x12,
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| 0x31,0x11,0x10,0x0A,0xF0,0x9C,0x32,0x02,
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| 0x21,0x61,0x1D,0x07,0x9F,0x64,0x20,0x27,
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| 0x22,0x21,0x1E,0x06,0xF0,0x76,0x08,0x28,
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| 0x02,0x01,0x06,0x00,0xF0,0xF2,0x03,0x95,
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| 0x21,0x61,0x1C,0x07,0x82,0x81,0x16,0x07,
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| 0x23,0x21,0x1A,0x17,0xEF,0x82,0x25,0x15,
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| 0x25,0x11,0x1F,0x00,0x86,0x41,0x20,0x11,
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| 0x85,0x01,0x1F,0x0F,0xE4,0xA2,0x11,0x12,
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| 0x07,0xC1,0x2B,0x45,0xB4,0xF1,0x24,0xF4,
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| 0x61,0x23,0x11,0x06,0x96,0x96,0x13,0x16,
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| 0x01,0x02,0xD3,0x05,0x82,0xA2,0x31,0x51,
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| 0x61,0x22,0x0D,0x02,0xC3,0x7F,0x24,0x05,
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| 0x21,0x62,0x0E,0x00,0xA1,0xA0,0x44,0x17
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| };
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