Memory mapped registers: Difference between revisions

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|$3C0004
|$3C0004
|Word
|Word
|REG_VRAMINC
|REG_VRAMMOD
|Reads VRAM address modulo
|Reads VRAM address modulo
|Sets VRAM address modulo (signed)
|Sets VRAM address modulo (signed)
|-
|-
|$3C0006
|$3C0006
|REG_HBLANKCNT
|Word
|Word
|REG_HBLANKCNT
|{{16BitRegister|Raster line counter|9|?|3|1:50Hz<br>0:60Hz|1|[[Auto animation]] counter|3}}
|{{16BitRegister|Raster line counter|9|?|3|1:50Hz<br>0:60Hz|1|[[Auto animation]] counter|3}}
Line counter: (diagram needed)<br>
Line counter: (diagram needed)<br>
Line 220: Line 220:
|-
|-
|$3C0008
|$3C0008
|REG_HBLANKPOS
|Word
|Word
|REG_HBLANKPOS
|Invalid
|Invalid
|MSB of RLI position (number of pixels)
|MSB of RLI position (number of pixels)

Revision as of 11:08, 12 February 2011

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

Address Name Size Read Write Handled by
$300000 REG_P1CNT Byte Player 1 controls (active low)
Bit 7 6 5 4 3 2 1 0
Def D CBARightLeftDownUp
? NEO-C1
$300001 REG_DIPSW Byte Dipswitches (active low)
Bit 7 6 5 4 3 2 1 0
Def Freeze FreeplayCoin meters ?Autofire?Test mode
Kick watchdog NEO-F0 (read)
$300081 ? Byte? ? ? ?
$320000 REG_SOUND Byte Out to Z80 In from Z80 NEO-D0 ?
$320001 REG_STATUS_A Byte
Bit 7 6 5 4 3 2 1 0
Def ?
? ?
$340000 REG_P2CNT Byte Player 2 controls (active low)
Bit 7 6 5 4 3 2 1 0
Def D CBARightLeftDownUp
? NEO-C1
$380000 REG_STATUS_B Byte
Bit 7 6 5 4 3 2 1 0
Def ? Memory card write protectMemory card insertedSelect P2Start P2Select P1Start P1
? NEO-C1
$380000 ? Byte ? MAME select_controller ?
$380021 REG_SLOT Byte ?
Bit 7 6 5 4 3 2 1 0
Def ? Slot #
NEO-F0?
$380030 ? Byte ? MAME set_output_latch NEO-F0?
$380040 ? Byte ? MAME set_output_data NEO-F0?
$380050 ? Byte ? MAME upd4990a_control_16_w NEO-F0?
$380001 ? Byte ? Joypad ports outputs
Bit 7 6 5 4 3 2 1 0
Def ? P2 outputsP1 outputs
NEO-D0


System registers, handled by a 74HC259 adressable latch.

Address Name Size Read Write
$3A0001 REG_DISPENABL Byte Invalid Normal video output
$3A0011 REG_DISPDSABL Byte Invalid Darken video output
$3A0003 ? Byte Invalid Use the BIOS vector table
$3A0013 REG_SWPROM Byte Invalid Use the cart's vector table
See ASM Defines.
$3A000B REG_BRDFIX Byte Invalid Use the embeded fix tileset (SFIX)
$3A001B REG_CRTFIX Byte Invalid Use the cart's fix tileset
$3A000D REG_SRAMLOCK Byte Invalid Write-protects the SRAM (MVS)
$3A001D REG_SRAMULOCK Byte Invalid Unprotects SRAM (MVS)
$3A000F REG_PALBANK1 Byte Invalid Use palette bank 1
$3A001F REG_PALBANK0 Byte Invalid Use palette bank 0


Video related registers, probably handled by the LSPC chips.

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 Word REG_VRAMMOD 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 ?1:50Hz
0:60Hz
Auto animation counter

Line counter: (diagram needed)
$00F8-$00FF : Vertical sync
$0100-$010F : Top border
$0110-$01EF : Active display
$01F0-$01FF : Bottom border

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Def Auto animation speed (in frames) HBlank (RLI) interrupt modeHBlank interrupt enabledDisable 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 only (from NeoCD's source)

NEO-MGA / LC8953 ?

  • $FF011C (word): read: return 0xff | (region_code << 8);
  • $FF0002 (word)
  • $FF007E,$FF008f (word) dma_mode
  • $FF0105 (byte) upload_type_w
  • $FF0111 (byte) spr_disable
  • $FF0115 (byte) fix_disable
  • $FF0119 (byte) video_enable
  • $FF016F (byte) disable_irq_w
  • $FF0183 (byte) z80_enable