Memory mapped registers: Difference between revisions

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m (26 revisions: Import from wikkii)
m (Additions from official SNK doc)
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|$380000
|$380000
|REG_STATUS_B
|REG_STATUS_B
|{{8BitRegister|?|1|[[Memory card]]<br>write protect|2|Memory card<br>inserted|1|Select P2|1|Start P2|1|Select P1|1|Start P1|1|}}
|{{8BitRegister|0:AES<br>1:MVS|1|[[Memory card]]<br>write enabled (0)|2|Memory card<br>inserted (0)|1|Select P2|1|Start P2|1|Select P1|1|Start P1|1|}}
|?
|?
|[[NEO-C1]]
|[[NEO-C1]]
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|-
|-
|$380011
|$380011
|REG_CRDBANK
|?
|?
|?
|Memory card bank selection (bits 0~2)
|Write only, after a write to $3A0019
|[[NEO-D0]]
|?
|-
|-
|$380021
|$380021
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|-
|-
|$3A0001
|$3A0001
|REG_DISPENABL
|REG_NOSHADOW
|Normal video output
|Normal video output
|-
|-
|$3A0011
|$3A0011
|REG_DISPDSABL
|REG_SHADOW
|[[Video DAC|Darken]] video output
|[[Video DAC|Darken]] video output
|-
|-
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|-
|-
|$3A0009
|$3A0009
|?
|REG_CRDREGSEL
|?
|Enable "Register select" for memory card
|-
|-
|$3A0019
|$3A0019
|?
|REG_CRDNORMAL
|?
|DIsable "Register select" for memory card
|-
|-
|$3A000B
|$3A000B
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|REG_HBLANKCNT
|REG_HBLANKCNT
|Word
|Word
|{{16BitRegister|Raster line counter.<br>See [[Display timing]]|9|?|3|1:50Hz<br>0:60Hz|1|[[Auto animation]] counter|3}}
|{{16BitRegister|Raster line counter.<br>See [[Display timing]]|9|?|3|1:50Hz<br>0:60Hz ([[GPU|LSPC2]] only)|1|[[Auto animation]] counter|3}}
|{{16BitRegister|Auto animation speed<br>(in frames)|8|Raster interrupt<br>mode|3|Raster interrupt<br>enable|1|Disable auto animation|1|?|3}}
|{{16BitRegister|Auto animation speed<br>(in frames)|8|Raster interrupt<br>mode|3|Raster interrupt<br>enable|1|Disable auto animation|1|?|3}}
|-
|-

Revision as of 02:17, 27 June 2011

Note: Most of the register names come from neogeo_spex.pdf

I/O registers

Always read/written as bytes (?)

Address Name Read Write Handled by
$300000 REG_P1CNT Player 1 controls (active low)
Bit 7 6 5 4 3 2 1 0
Def D CBARightLeftDownUp
? NEO-C1
$300001 REG_DIPSW Dipswitches (active low)
Bit 7 6 5 4 3 2 1 0
Def Freeze FreeplayMultiplayer configurationController mode (normal or mahjong)Coin mode (normal or versus)Test mode
Kick watchdog NEO-F0 (read)
$300081 ? Read only ? ?
$320000 REG_SOUND Send command to Z80 Read Z80 reply code NEO-D0 ?
$320001 REG_STATUS_A
Bit 7 6 5 4 3 2 1 0
Def NEC D4990 data bit NEC D4990 time pulse?ServiceCoin 2Coin 1
? ?
$340000 REG_P2CNT Player 2 controls (active low)
Bit 7 6 5 4 3 2 1 0
Def D CBARightLeftDownUp
? NEO-C1
$380000 REG_STATUS_B
Bit 7 6 5 4 3 2 1 0
Def 0:AES
1:MVS		 Memory card
write enabled (0)		Memory card
inserted (0)		Select P2Start P2Select P1Start P1
? NEO-C1
$380001 REG_POUTPUT ? Joypad ports outputs
Bit 7 6 5 4 3 2 1 0
Def ? P2 outputsP1 outputs

MAME select_controller

NEO-D0
$380011 REG_CRDBANK ? Memory card bank selection (bits 0~2) NEO-D0
$380021 REG_SLOT ?
Bit 7 6 5 4 3 2 1 0
Def ? Slot #
NEO-F0?
$380030(1?) ? ? MAME set_output_latch (LED marquee ?) NEO-F0?
$380040(1?) ? ? MAME set_output_data (LED marquee ?) NEO-F0?
$380050(1?) ? ? MAME upd4990a_control_16_w (Calendar) NEO-F0?
$380061 ? ? Base address for writes (used by the MVS BIOS) ?
$380065 ? ? Write only (used by the MVS BIOS) ?
$380067 ? ? Write only (used by the MVS BIOS) ?
$3800E1 ? ? Write only (used by the MVS BIOS) ?

System registers

Handled by a 74HC259 adressable latch on cart systems. Byte writes only.

Address Name Write
$3A0001 REG_NOSHADOW Normal video output
$3A0011 REG_SHADOW Darken video output
$3A0003 REG_SWPBIOS Use the BIOS vector table
$3A0013 REG_SWPROM Use the cart's vector table
$3A0005 REG_CRDUNLOCK1 Enable writes to memory card (use REG_CRDUNLOCK2 too)
$3A0015 REG_CRDLOCK1 Disable writes to memory card
$3A0007 REG_CRDLOCK2 Disable writes to memory card
$3A0017 REG_CRDUNLOCK2 Enable writes to memory card (use REG_CRDUNLOCK1 too)
$3A0009 REG_CRDREGSEL Enable "Register select" for memory card
$3A0019 REG_CRDNORMAL DIsable "Register select" for memory card
$3A000B REG_BRDFIX Use the embedded SFIX and SM1 ROM
$3A001B REG_CRTFIX Use the cart's S ROM and M ROM
$3A000D REG_SRAMLOCK Write-protects SRAM (MVS)
$3A001D REG_SRAMULOCK Unprotects SRAM (MVS)
$3A000F REG_PALBANK1 Use palette bank 1
$3A001F REG_PALBANK0 Use palette bank 0

Video registers

Handled by the GPUs.

Address Name Size Read Write
$3C0000 REG_VRAMADDR Word Read VRAM (address isn't changed) Sets VRAM address
$3C0002 REG_VRAMRW Word Read VRAM (address isn't changed) Write VRAM
$3C0004 REG_VRAMMOD Word Reads VRAM address modulo Sets VRAM address modulo (signed)
$3C0006 REG_HBLANKCNT Word
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Def Raster line counter.
See Display timing		 ?1:50Hz
0:60Hz (LSPC2 only)		Auto animation counter
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Def Auto animation speed
(in frames)		 Raster interrupt
mode		Raster interrupt
enable		Disable auto animation?
$3C0008 REG_HBLANKPOS Word Invalid MSB of RLI position (number of pixels)
$3C000A ? Word Invalid LSB of RLI position (number of pixels)
$3C000C REG_IRQACK Byte Invalid Interrupt Acknowledge.
Bit 7 6 5 4 3 2 1 0
Def ? Ack VBlankAck HBlankAck IRQ3
$3C000E

$3C000F

? ? Some emulators treat these locations like $3C000A.


NeoGeo CD registers

NEO-MGA / LC8953 / LC98000 ?

Address Name Size Read Write Handled by
$FF0002 ? Word ? NeoRaine load_files ?
$FF0004 ? Word ? CDM3-2 BIOS writes 0,1,3,7 ?
$FF000E ? Byte ? CDM3-2 BIOS writes $3F,$3C ?
$FF000F ? Byte ? CDM3-2 BIOS writes $20,$10,$08,$04 ?
$FF0011 ? Byte ? CDM3-2 BIOS writes $FE ?
$FF0017 ? Byte CDM3-2 BIOS read/writes bit 0 ?
$FF0061 ? Byte ? Bit4: Run microcode ? LC8953
$FF0064~$FF0070 ? (Long)words ? Registers used by microcode (NeoRaine upload_param)
$FF007E~$FF008F ? Words ? Microcode (16x9bit instructions ?)
$FF0101 ? Byte ? CDM3-2 BIOS writes low nibble ?
$FF0103 ? Byte CDM3-2 BIOS: sequential read/writes ?
$FF0105 ? Byte ? upload_type_w ?
$FF0108 ? Word ? CDM3-2 BIOS writes $5555 ?
$FF010C ? Word ? CDM3-2 BIOS writes $5555 and reads ?
$FF0111 REG_DISBLSPR Byte ? Disable/enable sprites ? NEO-GRC/NEO-OFC
$FF0115 REG_DISBLFIX Byte ? Disable/enable fix layer ?
$FF0119 REG_ENVIDEO Byte ? Enable/disable video output ? (disable works)
$FF011C REG_CDCONFIG Word
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Def 1 0CD lid switchConfiguration jumpers?
No effect NEO-CDD board
$FF0121 REG_UPMAPSPR Byte ? Set upload zone to SPR DRAM ?
$FF0123 REG_UPMAPPCM Set upload zone to PCM DRAM
$FF0127 REG_UPMAPZ80 Set upload zone to Z80 DRAM
$FF0129 REG_UPMAPFIX Set upload zone to FIX DRAM
$FF0141 REG_UPUNMAPSPR Unset SPR DRAM to upload zone
$FF0143 REG_UPUNMAPPCM Unset PCM DRAM to upload zone
$FF0147 REG_UPUNMAPZ80 Unset Z80 DRAM to upload zone
$FF0149 REG_UPUNMAPFIX Unset FIX DRAM to upload zone
$FF016F REG_DISBLIRQ Byte ? Disable/enable interrupts ?
$FF0183 REG_ENZ80 Byte ? Enable/disable(reset) Z80 ?
$FF0188 REG_CDDALEFTL Word See Reading CDDA sound levels No effect NEO-MGA
$FF018A REG_CDDARIGHTL
$FF01A1 ? Byte ? Upload zone 1MiB SPR DRAM bank selection ?
$FF01A3 ? Byte ? Upload zone 1MiB PCM DRAM bank selection ?
$FF01A7 ? Byte ? CDM3-2 BIOS writes ?
$FF01FC ? Word ? CDDA control ? ?
$FF01FE ? Word ? CD DA/data switch ? ?
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