Memory mapped registers: Difference between revisions

From NeoGeo Development Wiki
Jump to navigation Jump to search
mNo edit summary
mNo edit summary
Line 27: Line 27:
|$300081
|$300081
|?
|?
|Byte?
|Byte
|?
|Read only
|?
|?
|?
|?
Line 35: Line 35:
|REG_SOUND
|REG_SOUND
|Byte
|Byte
|Out to Z80
|[[68k/Z80 communication|Send command to Z80]]
|In from Z80
|Read Z80 reply code
||[[NEO-D0]] ?
||[[NEO-D0]] ?
|-
|-
Line 61: Line 61:
|[[NEO-C1]]
|[[NEO-C1]]
|-
|-
|$380000
|$380001
|?
|Byte
|?
|Joypad ports outputs
{{8BitRegister|?|2|P2 outputs|3|P1 outputs|3}}
MAME select_controller
|[[NEO-D0]]
|-
|$380011
|?
|?
|Byte
|Byte
|?
|?
|MAME select_controller
|Write only, after a write to $3A0019
|?
|?
|-
|-
Line 75: Line 84:
|[[NEO-F0]]?
|[[NEO-F0]]?
|-
|-
|$380030
|$380030(1?)
|?
|?
|Byte
|Byte
|?
|?
|MAME set_output_latch
|MAME set_output_latch (LED marquee ?)
|[[NEO-F0]]?
|[[NEO-F0]]?
|-
|-
|$380040
|$380040(1?)
|?
|?
|Byte
|Byte
|?
|?
|MAME set_output_data
|MAME set_output_data (LED marquee ?)
|[[NEO-F0]]?
|[[NEO-F0]]?
|-
|-
|$380050
|$380050(1?)
|?
|?
|Byte
|Byte
|?
|?
|MAME upd4990a_control_16_w
|MAME upd4990a_control_16_w ([[Calendar]])
|[[NEO-F0]]?
|[[NEO-F0]]?
|-
|-
|$380001
|$380061
|?
|Byte
|?
|Base address for writes (used by the MVS BIOS)
|?
|-
|$380065
|?
|Byte
|?
|Write only (used by the MVS BIOS)
|?
|-
|$380067
|?
|?
|Byte
|Byte
|?
|?
|Joypad ports outputs
|Write only (used by the MVS BIOS)
{{8BitRegister|?|2|P2 outputs|3|P1 outputs|3}}
|?
|[[NEO-D0]]
|}
|}


Line 138: Line 160:
|Use the cart's vector table
|Use the cart's vector table
|-
|-
|See [[ASM Defines]].
|$3A0005
|
|REG_CRDUNLOCK1
|
|Byte
|
|Invalid
|
|Allow /WE to pass through to memory card when low
|-
|$3A0015
|REG_CRDLOCK1
|Byte
|Invalid
|Don't allow /WE to pass through to memory card
|-
|$3A0007
|REG_CRDLOCK2
|Byte
|Invalid
|Don't allow /WE to pass through to memory card
|-
|$3A0017
|REG_CRDUNLOCK1
|Byte
|Invalid
|Allow /WE to pass through to memory card when high   
|-
|$3A0009
|?
|Byte
|Invalid
|?
|-
|$3A0019
|?
|Byte
|Invalid
|?
|-
|-
|$3A000B
|$3A000B
Line 250: Line 302:
*$FF011C (word): read: return 0xff | (region_code << 8);
*$FF011C (word): read: return 0xff | (region_code << 8);
*$FF0002 (word)
*$FF0002 (word)
*$FF007E,$FF008f (word) dma_mode
*$FF007E,$FF008F (word) dma_mode
*$FF0105 (byte) upload_type_w
*$FF0105 (byte) upload_type_w
*$FF0111 (byte) spr_disable
*$FF0111 (byte) spr_disable

Revision as of 08:20, 23 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 Read only ? ?
$320000 REG_SOUND Byte Send command to Z80 Read Z80 reply code 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
$380001 ? Byte ? Joypad ports outputs
Bit 7 6 5 4 3 2 1 0
Def ? P2 outputsP1 outputs

MAME select_controller

NEO-D0
$380011 ? Byte ? Write only, after a write to $3A0019 ?
$380021 REG_SLOT Byte ?
Bit 7 6 5 4 3 2 1 0
Def ? Slot #
NEO-F0?
$380030(1?) ? Byte ? MAME set_output_latch (LED marquee ?) NEO-F0?
$380040(1?) ? Byte ? MAME set_output_data (LED marquee ?) NEO-F0?
$380050(1?) ? Byte ? MAME upd4990a_control_16_w (Calendar) NEO-F0?
$380061 ? Byte ? Base address for writes (used by the MVS BIOS) ?
$380065 ? Byte ? Write only (used by the MVS BIOS) ?
$380067 ? Byte ? Write only (used by the MVS BIOS) ?


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
$3A0005 REG_CRDUNLOCK1 Byte Invalid Allow /WE to pass through to memory card when low
$3A0015 REG_CRDLOCK1 Byte Invalid Don't allow /WE to pass through to memory card
$3A0007 REG_CRDLOCK2 Byte Invalid Don't allow /WE to pass through to memory card
$3A0017 REG_CRDUNLOCK1 Byte Invalid Allow /WE to pass through to memory card when high
$3A0009 ? Byte Invalid ?
$3A0019 ? Byte Invalid ?
$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
Retrieved from "https://wiki.neogeodev.org/index.php?title=Memory_mapped_registers&oldid=106"