NeoGeo Development Wiki - User contributions [en]

Memory mapped registers

2026-08-12T10:33:33Z

ArcadeTV: /* System registers */ Correction: (From the off. SNK Docs) $3A000F -> Palette Bank 0, $3A001F -> Palette Bank 1

=Address decode masks=

Decode masks aren't verified !

Decode masks are used to know which register will be mapped to a given address, they can be seen as a sort of mirroring range notation.

A "1" bit means that the corresponding address bit is involved in decoding, a "0" means it's ignored.

For example, {{Reg|REG_P1CNT}}'s base is $300000 and its mask is $FE0001:
<pre>
BASE 00110000 00000000 00000000
MASK 11111110 00000000 00000001
0011000x xxxxxxxx xxxxxxx0
</pre>

This means that it's also accessible at $300002, $300004, $300006... up to $31FFFE. The highest address is BASE OR (NOT MASK).

==Mirror guesser==

<div id="mirror-guesser"></div>
<div id="mguessresult"></div>

=Register descriptions=

==I/O registers==

===REG_P1CNT===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|[[Joypad]] port 1 inputs (active low)
{{8BitRegister|D|1|C|1|B|1|A|1|Right|1|Left|1|Down|1|Up|1}}
|?
|}

*Address: $300000
*Decode mask: $FE0001
*Handled by: {{Chipname|NEO-C1}}

 
----

===REG_DIPSW===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|[[Hardware DIPs]] (active low) {{8BitRegister|Freeze game|1|Freeplay|1|Enable [[Multiplayer]]|1|Multiplayer ID code|2|0:Normal controller 1:Mahjong keyboard|1|0:1 coin chute 1:2 coin chutes|1|Settings mode|1}}
|Kick [[watchdog]]
|}

*Address: $300001
*Decode mask: $FE0081 (not sure for write)
*Handled by: {{Chipname|NEO-F0}} (read), {{Chipname|NEO-B1}} (write)

 
----

===REG_SYSTYPE===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|{{8BitRegister|[[Test button]]|1|[[NEO-F0|Type]] 0: 2 slots 1: 4 or 6 slots|1|?|6}}
|?
|}

Reads the unused [[Hardware DIPs|DSW2]] on {{PCB|MV4}} boards. Used for system ID on other boards.

*Address: $300081
*Decode mask: $FE0081
*Handled by: {{Chipname|NEO-F0}}

 
----

===REG_SOUND===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|[[68k/Z80 communication|Read Z80 reply code]]
|Send command to {{Chipname|Z80}}
|}

*Address: $320000
*Decode mask: $FE0001
*Handled by: {{Chipname|NEO-C1}}

 
----

===REG_STATUS_A ===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|Switch inputs are active low
{{8BitRegister|[[RTC]] data bit|1|RTC time pulse|1|0:4-SLOT 1:6-SLOT|1|[[Coin_switch|Coin-in]] 4|1|Coin-in 3|1|[[Service button]]|1|Coin-in 2|1|Coin-in 1|1}}
|?
|}

*Address: $320001
*Decode mask: $FE0001
*Handled by: {{Chipname|NEO-F0}}

 
----

===REG_P2CNT===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|Joypad port 2 inputs (active low)
{{8BitRegister|D|1|C|1|B|1|A|1|Right|1|Left|1|Down|1|Up|1}}
|?
|}

*Address: $340000
*Decode mask: $FE0001
*Handled by: {{Chipname|NEO-C1}}

 
----

===REG_STATUS_B===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|On cart-based systems
{{8BitRegister|0:AES 1:MVS|1|1:[[Memory card]] is write protected|1|00:Memory card correctly inserted|2|Select P2|1|Start P2|1|Select P1|1|Start P1|1|}}
|?
|-
|On CD systems
{{8BitRegister|Always 0|4|Select P2|1|Start P2|1|Select P1|1|Start P1|1|}}
|?
|}

*Address: $380000
*Decode mask: $FE0001
*Handled by: {{Chipname|NEO-C1}}

The player controls bits are active low.

 
----

===REG_POUTPUT===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|?
|Joypad ports [[Pinouts#joypad ports|outputs]]
{{8BitRegister|?|2|P2 outputs|3|P1 outputs|3}}
|}

*Address: $380001
*Decode mask: $FE0071
*Handled by: {{Chipname|NEO-D0}}

 
----

===REG_CRDBANK===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|?
|{{8BitRegister| |5|Memory card bank selection|3}}
|}

*Address: $380011
*Decode mask: $FE0071
*Handled by: {{Chipname|NEO-D0}}

 
----

===REG_SLOT===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|?
|{{8BitRegister|?|5|Slot #|3|}}
(Mirror of REG_POUTPUT on the AES)
|}

*Address: $380021
*Decode mask: $FE00F1
*Handled by: {{Chipname|NEO-F0}}

 
----

===REG_LEDLATCHES===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|?
|{{8BitRegister|?|2|Latch LED2 data|1|Latch LED1 data|1|Latch [[marquee]] data|1|?|3}}
LED data is latched on 1 to 0 transition.
|}

*Address: $380031
*Decode mask: $FE00F1
*Handled by: {{Chipname|NEO-F0}}

 
----

===REG_LEDDATA===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|?
|8-bit data for credits displays and the [[marquee]]. See [[MV-LED]].
|}

*Address: $380041
*Decode mask: $FE00F1
*Handled by: {{Chipname|NEO-F0}}

 
----

===REG_RTCCTRL===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|?
|MAME upd4990a_control_16_w {{8BitRegister||5|[[RTC]] Strobe|1|RTC Clock|1|RTC DIN|1|}}
|}

*Address: $380051
*Decode mask: $FE00F1
*Handled by: {{Chipname|NEO-F0}}

 
----

===REG_RESETCC1===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|?
|Any, [[coin counter]] 1 floats
|}

*Address: $380061
*Decode mask: $FE00F1
*Handled by: {{Chipname|NEO-I0}}

 
----

===REG_RESETCC2===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|?
|Any, [[coin counter]] 2 floats
|}

*Address: $380063
*Decode mask: $FE00F1
*Handled by: {{Chipname|NEO-I0}}

 
----

===REG_RESETCL1===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|?
|Any, [[coin lockout]] 1 floats
|}

*Address: $380065
*Decode mask: $FE00F1
*Handled by: {{Chipname|NEO-I0}}

 
----

===REG_RESETCL2===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|?
|Any, [[coin lockout]] 2 floats
|}

*Address: $380067
*Decode mask: $FE00F1
*Handled by: {{Chipname|NEO-I0}}

 
----

===REG_SETCC1===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|?
|Any, coin counter 1 sinks current
|}

*Address: $3800E1
*Decode mask: $FE00F1
*Handled by: {{Chipname|NEO-I0}}

 
----

===REG_SETCC2===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|?
|Any, coin counter 2 sinks current
|}

*Address: $3800E3
*Decode mask: $FE00F1
*Handled by: {{Chipname|NEO-I0}}

 
----

===REG_SETCL1===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|?
|Any, coin lockout 1 sinks current
|}

*Address: $3800E5
*Decode mask: $FE00F1
*Handled by: {{Chipname|NEO-I0}}

 
----

===REG_SETCL2===

{|class="regdef" style="float:right; margin-left:16px; width:600px;"
|'''Read'''
|'''Write'''
|-
|?
|Any, coin lockout 2 sinks current
|}

*Address: $3800E7
*Decode mask: $FE00F1
*Handled by: {{Chipname|NEO-I0}}

==System registers==

Data written doesn't matter. Odd byte writes only. Decode mask: $FE0001.

Registers go in pairs, bit 4 of the address is actually the data bit.

Handled by a 74HC259 addressable latch on cart systems.

{| class="regdef"
|'''Address'''
|'''Name'''
|'''Write'''
|-
|$3A0001
|REG_NOSHADOW
|Normal video output
|-
|$3A0011
|REG_SHADOW
|[[Video DAC|Darken]] video output
|-
|$3A0003
|REG_SWPBIOS
|Use the |BIOS [[Vector_table_swap|vector table]]
|-
|$3A0013
|REG_SWPROM
|Use the cart's vector table
|-
|$3A0005
|REG_CRDUNLOCK1
|Enable writes to [[memory card]] (unused in CD systems)
|-
|$3A0015
|REG_CRDLOCK1
|Disable writes to memory card (unused in CD systems)
|-
|$3A0007
|REG_CRDLOCK2
|Disable writes to memory card (unused in CD systems)
|-
|$3A0017
|REG_CRDUNLOCK2
|Enable writes to memory card (unused in CD systems)
|-
|$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 ROM]] and [[SM1]] ROM
|-
|$3A001B
|REG_CRTFIX
|Use the cart's [[S ROM]] and [[M1 ROM]]
|-
|$3A000D
|REG_SRAMLOCK
|Write-protects [[backup RAM]] (MVS)
|-
|$3A001D
|REG_SRAMUNLOCK
|Unprotects backup RAM (MVS)
|-
|$3A000F
|REG_PALBANK0
|Use [[palette RAM|palette]] bank 0
|-
|$3A001F
|REG_PALBANK1
|Use palette bank 1
|}

==Video registers==

Handled by the [[LSPC]]. Byte writes are only effective on even addresses and they store the same data in both bytes. Odd addresses aren't mapped ? Decode mask: $FE0001.

{| class="regdef"
|'''Address'''
|'''Name'''
|'''Read'''
|'''Write'''
|-
|$3C0000
|REG_VRAMADDR
|Read from [[VRAM]] (address doesn't change)
|Sets VRAM address
|-
|$3C0002
|REG_VRAMRW
|Read from VRAM (address doesn't change)
|Write to VRAM (modulo is applied after)
|-
|$3C0004
|REG_VRAMMOD
|Reads VRAM address modulo
|Sets VRAM address modulo
|-
|$3C0006
|REG_LSPCMODE
|{{16BitRegister|Raster line counter. See [[Display_timing#Vertical|Display timing]]|9|0|3|1:50Hz 0:60Hz ([[GPU|LSPC2]] only)|1|[[Auto animation]] counter|3}}
|{{16BitRegister|Auto animation speed (in frames)|8|[[Timer interrupt]] mode|3|Timer interrupt enable|1|Disable auto animation|1|Unused|3}}
Reset value: ????????00000---
|-
|$3C0008
|REG_TIMERHIGH
|Like REG_VRAMADDR.
|16 highest bits of the [[timer interrupt|timer]] reload value.
|-
|$3C000A
|REG_TIMERLOW
|Like REG_VRAMRW.
|16 lowest bits of the timer reload value.
|-
|$3C000C
|REG_IRQACK
|Like REG_VRAMMOD.
|[[68k interrupts|Interrupt]] acknowledge.
{{8BitRegister|Unused|5|Ack VBlank IRQ|1|Ack timer IRQ|1|Ack IRQ3|1}}
|-
|$3C000E
|REG_TIMERSTOP
|Like REG_LSPCMODE.
|Bit 0=1: Stops timer counter during first and last 16 lines (32 total) when in PAL mode.
|}

==NeoGeo CD registers==

[[NEO-MGA]] / [[LC8953]] / [[LC98000]] ?

===CD drive===

{| class="regdef"
|'''Address'''
|'''Name'''
|'''Size'''
|'''Read'''
|'''Write'''
|'''Handled by'''
|-
|$FF0161
|REG_CDDINPUT
|Byte
|{{8BitRegister|-|3|CDCK input|1|4-bit bus from the [[CD drive]]|4}}
|?
|[[NEO-MGA]]
|-
|$FF0163
|REG_CDDOUTPUT
|Byte
|?
|{{8BitRegister|-|4|4-bit bus to the [[CD drive]]|4}}
|[[NEO-MGA]]
|-
|$FF0165
|REG_CDDCTRL
|Byte
|?
|{{8BitRegister|-|4|Must be 0|2|Signal selection 0:4-bit bus direction 1:HOCK output|1|State Dir:0:Out 1:In HOCK:0:Low 1:High|1}}
|[[NEO-MGA]]
|-
|$FF0167
|REG_CDDSTAT
|Byte
|[[CD drive]] status lines.{{8BitRegister|-|3|MUTE|1|SBSO|1|SCOR|1|WFCK|1|EXCK|1}}
|{{8BitRegister|-|7|EXCK|1}}
|[[NEO-MGA]]
|}

===Video===

{| class="regdef"
|'''Address'''
|'''Name'''
|'''Size'''
|'''Read'''
|'''Write'''
|'''Handled by'''
|-
|$FF0111
|REG_DISBLSPR
|Byte
|?
|1=Disable 0=Enable sprites
|rowspan="3"|[[NEO-GRC]]/[[NEO-OFC]]
|-
|$FF0115
|REG_DISBLFIX
|Byte
|?
|1=Disable 0=Enable fix layer
|-
|$FF0119
|REG_ENVIDEO
|Byte
|?
|1=Enable 0=Disable video output.
|}

===Memory===

{| class="regdef"
|'''Address'''
|'''Name'''
|'''Size'''
|'''Read'''
|'''Write'''
|'''Handled by'''
|-
|$FF01A1
|REG_SPRBANK
|Byte
|?
|Upload zone 1MiB SPR DRAM bank selection (2 LSBs).
|?
|-
|$FF01A3
|REG_PCMBANK
|Byte
|?
|Upload zone 512KiB PCM DRAM bank selection (1 LSB).
|?
|-
|$FF01A7
|REG_???BANK
|Byte
|?
|$A00000 zone bank number. What is this ?
|?
|-
|$FF0121
|REG_UPMAPSPR
|rowspan="8"|Byte
|rowspan="8"|?
|NeoSetSpriteSlot(1);
Set [[68k memory map|upload zone]] to SPR [[DRAM]]
|rowspan="8"|?
|-
|$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
|}

===DMA===

{| class="regdef"
|'''Address'''
|'''Name'''
|'''Size'''
|'''Read'''
|'''Write'''
|'''Handled by'''
|-
|$FF0061
|?
|Byte
|?
|Bit 6: Execute DMA microcode
|rowspan="7"|[[LC8953]]
|-
|$FF0064~$FF0067
|REG_DMA_ADDR1
|Longword
|?
|Sets DMA source address.
|-
|$FF0068~$FF006B
|REG_DMA_ADDR2
|Longword
|?
|Sets DMA destination address.
|-
|$FF006C~$FF006F
|REG_DMA_VALUE
|Longword
|?
|Sets DMA value for filling.
|-
|$FF0070~$FF0073
|REG_DMA_COUNT
|Longword
|?
|Sets DMA length.
|-
|$FF007E
|REG_DMA_MODE
|Word
|?
|Sets DMA mode.
|-
|$FF007E~$FF008E
|?
|Words
|?
|Microcode (16x 9-bit opcodes)
|}

===Misc===

{| class="regdef"
|'''Address'''
|'''Name'''
|'''Size'''
|'''Read'''
|'''Write'''
|'''Handled by'''
|-
|$FF0002
|?
|Word
|?
|Enables Vector 22 interrupts. NeoRaine calls load_files.
|rowspan="8"|[[LC8953]]
|-
|$FF0004
|?
|Word
|?
|CDM3-2 BIOS writes 0,1,3,7
|-
|$FF0006
|?
|Word
|?
|CDM3-2 BIOS writes 0x71FF, CDZ writes 0x71FF
|-
|$FF0008
|?
|Word
|?
|CDM3-2 BIOS writes 0x0000, CDZ writes 0x0000
|-
|$FF000A
|?
|Word
|?
|CDM3-2 BIOS writes 0x7E40, CDZ writes 0x7E00
|-
|$FF000C
|?
|Word
|?
|Read and stored on vector 23 interrupt.
|-
|$FF000F
|?
|Byte
|?
|[[68k interrupts|Interrupt]] acknowledge.
{{8BitRegister|?|2|Vector 21|1|Vector 22|1|Vector 23|1|?|3}}
|-
|$FF0010/11
|?
|Byte
|?
|CDM3-2 BIOS writes $FE
|-
|$FF0017
|?
|Byte
|colspan="2"|CD mode, maybe CDDA mute ? Bit 0: 0=Audio 1=Data.
|?
|-
|$FF0101
|?
|Byte
|colspan="2"|LC8951 register address (4 LSB)
|rowspan="2"|[[LC89515]]
|-
|$FF0103
|?
|Byte
|colspan="2"|LC8951 register value
|-
|$FF0105
|REG_TRANSAREA
|Byte
|?
|Set active transfer area
*0:Sprites
*1:ADPCM
*4:Z80
*5:Fix
|?
|-
|$FF0108
|?
|Word
|?
|CDM3-2 BIOS writes $5555
|?
|-
|$FF010C
|?
|Word
|?
|CDM3-2 BIOS writes $5555 and reads
|?
|-
|$FF011C
|REG_CDCONFIG
|Word
|{{16BitRegister|1|2|CD Mech 0:TOP/CDZ 1:FRONT|1|Lid Status (Opposite on CDZ)|1|Configuration jumpers|4|?|8}}
|?
|[[NEO-CDD boards|NEO-CDD board]]
|-
|$FF016D
|
|Byte
|?
|MapVectorTable(!(byteValue == 0xFF));
|rowspan="4"|[[NEO-MGA]]
|-
|$FF016F
|REG_UPLOAD_EN
|Byte
|?
|Enable/disable writes to the [[68k memory map|upload zone]] ($E00000)
|-
|$FF0181
|REG_CDIRQ_EN
|Byte
|?
|Bit 0: Enable CD drive interrupt
|-
|$FF0183
|REG_Z80RST
|Byte
|?
|Active-low Z80 RESET ($0/$FF)
|}

===CDDA===

{| class="regdef"
|'''Address'''
|'''Name'''
|'''Size'''
|'''Read'''
|'''Write'''
|'''Handled by'''
|-
|$FF0188
|REG_CDDALEFTL
|rowspan="2"|Word
|rowspan="2"|See [[Reading CDDA sound levels]]
|rowspan="2"|No effect
|rowspan="2"|[[NEO-MGA]]
|-
|$FF018A
|REG_CDDARIGHTL
|-
|$FF01FC
|?
|Word
|?
|CDDA control ?
|?
|-
|$FF01FE
|?
|Word
|?
|CD music/data switch ?
|?
|}

[[Category:Base system]]
[[Category:Code]]

68k ASM defines

2026-08-12T10:10:49Z

ArcadeTV: corrected: BIOS_P2TIMER equ $10FD9F because $10FD99 is BIOS_P1TIMER

Here are assembly defines/aliases for memory locations and constants. For detailed descriptions, see [[Memory mapped registers]].

These can be copied into a file and included in your assembly project to use register names instead of their (meaningless) addresses.

<syntaxhighlight>
;Hard DIPs:
DIPSW_SETTINGS equ 0
DIPSW_CHUTES equ 1
DIPSW_CTRL equ 2
DIPSW_ID0 equ 3
DIPSW_ID1 equ 4
DIPSW_MULTI equ 5
DIPSW_FREEPLAY equ 6
DIPSW_FREEZE equ 7

;VRAM zones:
SCB1 equ $0000 ;Sprite tilemaps
FIXMAP equ $7000
SCB2 equ $8000 ;Sprite shrink values
SCB3 equ $8200 ;Sprite Y positions, heights and flags
SCB4 equ $8400 ;Sprite X positions

;Basic colors:
BLACK equ $8000
MIDRED equ $4700
RED equ $4F00
MIDGREEN equ $2070
GREEN equ $20F0
MIDBLUE equ $1007
BLUE equ $100F
MIDYELLOW equ $6770
YELLOW equ $6FF0
MIDMAGENTA equ $5707
MAGENTA equ $5F0F
MIDCYAN equ $3077
CYAN equ $30FF
ORANGE equ $6F70
MIDGREY equ $7777
WHITE equ $7FFF

;Zones:
RAMSTART equ $100000 ;68k work RAM
PALETTES equ $400000 ;Palette RAM
BACKDROP equ PALETTES+(16*2*256)-2
MEMCARD equ $800000 ;Memory card
SYSROM equ $C00000 ;System ROM

;Registers:
REG_P1CNT equ $300000
REG_DIPSW equ $300001 ;Dipswitches/Watchdog
REG_SOUND equ $320000 ;Z80 I/O
REG_STATUS_A equ $320001
REG_P2CNT equ $340000
REG_STATUS_B equ $380000
REG_POUTPUT equ $380001 ;Joypad port outputs
REG_SLOT equ $380021 ;Slot select

REG_NOSHADOW equ $3A0001 ;Video output normal/dark
REG_SHADOW equ $3A0011
REG_BRDFIX equ $3A000B ;Use embedded fix tileset
REG_CRTFIX equ $3A001B ;Use game fix tileset
REG_PALBANK1 equ $3A000F ;Use palette bank 1
REG_PALBANK0 equ $3A001F ;Use palette bank 0 (default)

REG_VRAMADDR equ $3C0000
REG_VRAMRW equ $3C0002
REG_VRAMMOD equ $3C0004
REG_LSPCMODE equ $3C0006
REG_TIMERHIGH equ $3C0008
REG_TIMERLOW equ $3C000A
REG_IRQACK equ $3C000C
REG_TIMERSTOP equ $3C000E

;System ROM calls:
SYS_INT1 equ $C00438
SYS_RETURN equ $C00444
SYS_IO equ $C0044A
SYS_CREDIT_CHECK equ $C00450
SYS_CREDIT_DOWN equ $C00456
SYS_READ_CALENDAR equ $C0045C ;MVS only
SYS_CARD equ $C00468
SYS_CARD_ERROR equ $C0046E
SYS_HOWTOPLAY equ $C00474 ;MVS only
SYS_FIX_CLEAR equ $C004C2
SYS_LSP_1ST equ $C004C8 ;Clear sprites
SYS_MESS_OUT equ $C004CE

;RAM locations:
BIOS_SYSTEM_MODE equ $10FD80
BIOS_MVS_FLAG equ $10FD82
BIOS_COUNTRY_CODE equ $10FD83
BIOS_GAME_DIP equ $10FD84 ;Start of soft DIPs settings (up to $10FD93)

;Set by SYS_IO:
BIOS_P1STATUS equ $10FD94
BIOS_P1PREVIOUS equ $10FD95
BIOS_P1CURRENT equ $10FD96
BIOS_P1CHANGE equ $10FD97
BIOS_P1REPEAT equ $10FD98
BIOS_P1TIMER equ $10FD99

BIOS_P2STATUS equ $10FD9A
BIOS_P2PREVIOUS equ $10FD9B
BIOS_P2CURRENT equ $10FD9C
BIOS_P2CHANGE equ $10FD9D
BIOS_P2REPEAT equ $10FD9E
BIOS_P2TIMER equ $10FD9F

BIOS_STATCURNT equ $10FDAC
BIOS_STATCHANGE equ $10FDAD
BIOS_USER_REQUEST equ $10FDAE
BIOS_USER_MODE equ $10FDAF
BIOS_START_FLAG equ $10FDB4
BIOS_MESS_POINT equ $10FDBE
BIOS_MESS_BUSY equ $10FDC2

;Memory card:
BIOS_CRDF equ $10FDC4 ;Byte: function to perform when calling BIOSF_CRDACCESS
BIOS_CRDRESULT equ $10FDC6 ;Byte: 00 on success, else 80+ and encodes the error
BIOS_CRDPTR equ $10FDC8 ;Longword: pointer to read from/write to
BIOS_CRDSIZE equ $10FDCC ;Word: how much data to read/write from/to card
BIOS_CRDNGH equ $10FDCE ;Word: usually game NGH. Unique identifier for the game that owns the save file
BIOS_CRDFILE equ $10FDD0 ;Word: each NGH has up to 16 save files associated with

;Calendar, MVS only (in BCD):
BIOS_YEAR equ $10FDD2 ;Last 2 digits of year
BIOS_MONTH equ $10FDD3
BIOS_DAY equ $10FDD4
BIOS_WEEKDAY equ $10FDD5 ;Sunday = 0, Monday = 1 ... Saturday = 6
BIOS_HOUR equ $10FDD6 ;24 hour time
BIOS_MINUTE equ $10FDD7
BIOS_SECOND equ $10FDD8

BIOS_SELECT_TIMER equ $10FDDA ;Byte: game start countdown
BIOS_DEVMODE equ $10FE80 ;Byte: non-zero for developer mode

;Upload system ROM call:
BIOS_UPDEST equ $10FEF4 ;Longword
BIOS_UPSRC equ $10FEF8 ;Longword
BIOS_UPSIZE equ $10FEFC ;Longword
BIOS_UPZONE equ $10FEDA ;Byte: zone (0=PRG, 1=FIX, 2=SPR, 3=Z80, 4=PCM, 5=PAT)
BIOS_UPBANK equ $10FEDB ;Byte: bank

SOUND_STOP equ $D00046

;Button definitions:
CNT_UP equ 0
CNT_DOWN equ 1
CNT_LEFT equ 2
CNT_RIGHT equ 3
CNT_A equ 4
CNT_B equ 5
CNT_C equ 6
CNT_D equ 7
CNT_START1 equ 0
CNT_SELECT1 equ 1
CNT_START2 equ 2
CNT_SELECT2 equ 3
</syntaxhighlight>

==CD only==

<syntaxhighlight>
;System ROM calls
SYS_VIDEOEN equ $C00470
SYS_UPLOAD equ $C00546 ;Upload to DRAM
SYS_CDDACMD equ $C0056A ;Issue CDDA command

;DMA:
REG_DMACPYSRC equ $FF0064
REG_DMAFILDEST equ $FF0064
REG_DMACPYDEST equ $FF0068
REG_DMAFILVAL equ $FF006C
REG_DMASIZE equ $FF0070
REG_DMASTART equ $FF0060

REG_DISBLSPR equ $FF0111
REG_DISBLFIX equ $FF0115
REG_ENVIDEO equ $FF0119
REG_CDCONFIG equ $FF011C

REG_UPMAPSPR equ $FF0121
REG_UPMAPPCM equ $FF0123
REG_UPMAPZ80 equ $FF0127
REG_UPMAPFIX equ $FF0129
REG_UPUNMAPSPR equ $FF0141
REG_UPUNMAPPCM equ $FF0143
REG_UPUNMAPZ80 equ $FF0147
REG_UPUNMAPFIX equ $FF0149
REG_DISBLIRQ equ $FF016F
REG_ENZ80 equ $FF0183

REG_CDDALEFTL equ $FF0188 ;CD audio levels
REG_CDDARIGHTL equ $FF018A
</syntaxhighlight>

[[Category:Code]]

PROG-G2

2021-09-26T09:07:35Z

ArcadeTV: Added Viewpoint to the list of games this board is used for.

[[File:Prog-g2_mvs.jpg|thumb|400px]]

Board only used for [[Super Sidekicks]],[[Viewpoint]] and [[Fatal Fury 2]]. Can host [[SNK-9201]] as a security chip.

==Jumpers==

[[File:prog-g2.jpg]]

==Max capacity==

[[Category:Cartridge boards]]

File:Fixlayout-tmpl.png

2020-04-06T17:13:00Z

ArcadeTV: Programmatically created grid of the Fix layout for easy reference.

== Summary ==
Programmatically created grid of the Fix layout for easy reference.
== Licensing ==
{{cc-zero}}

Fix layer

2020-04-06T17:11:30Z

ArcadeTV:

The fix layer is a non-scrollable, tile-based layer with transparency which has the highest priority on the display (it always overlaps [[sprites]]). It is most often used to display text or HUDs like scores and health bars.

It is somewhat limited compared to sprites:
* Tilesets can only contain a maximum of 4096 tiles (128KiB) without using bankswitching (see below).
* Only the first 16 palettes can be used.

=Graphics format=

Fix tiles are 8*8 pixels, they're stored in the [[S ROM]], or in [[FIX file]]s before getting loaded to [[PSRAM]] in CD systems.
In some MVS systems, there is an embedded fix tileset stored in the [[SFIX ROM]] which can be swapped with the cartridge's one.

The tiles graphics are 4BPP like sprites tiles (15 colors, index 0 is transparent), each can be individually mapped to one of the first 16 [[palettes]] (4bit palette index).

See [[Fix graphics format]] for more details.

=Fix map=

[[File:Fixlayout.png|frame|Fix layout. The grey area is part of the display but only the area in the red rectangle should be used.]]

[[File:Fixlayout-tmpl.png|frame|Complete Fix layout map for reference.]]

The map is in [[VRAM]] starting at address $7000. The area used for display is 40*32 = 1280 words in size, but only 40x28 tiles are drawn in NTSC mode (2 hidden lines on the top and bottom).

Most games don't use the leftmost and rightmost columns, as some CRT screens can cut them off. SNK recomends only using a centered 38x28 safe zone.

Each map entry in VRAM uses a 16 bit word:

{{16BitRegister|Palette number|4|Tile number|12}}

Tiles are mapped from '''top to bottom, and left to right''' (see layout). The {{Reg|VRAM_MOD ($3C0004)}} register can be set to 32 if tiles need to be updated in lines. See [[Displaying text]].

=Bankswitching=

Games using the [[NEO-CMC]] chips are able to use more than 4096 fix tiles by using VRAM space $7500+. See [[Fix bankswitching]].

[[Category:Video system]]

File:Pcc-dim.jpg

2019-11-12T10:21:18Z

ArcadeTV: https://web.archive.org/web/20081225064420/http://pcmcia.org/pccard.htm

== Summary ==
https://web.archive.org/web/20081225064420/http://pcmcia.org/pccard.htm
== Licensing ==
{{Non-free Non commercial or educational}}

JEIDA V3

2019-11-12T10:20:28Z

ArcadeTV: Created page with "The PC Card Standard defines a 68-pin interface between the peripheral card and the socket into which it gets inserted. It defines three standard PC Card form factors, called..."

The PC Card Standard defines a 68-pin interface between the peripheral card and the socket into which it gets inserted. It defines three standard PC Card form factors, called Type I, Type II and Type III. All PC Cards measure the same length and width, differing only in thickness. Smaller cards can fit in larger sockets.
In addition to electrical and physical specifications, the PC Card Standard defines a software architecture to provide "plug and play" capability across the widest range of products. This software is made up of Socket Services and Card Services. It is Card and Socket Services that allow for interoperability of PC Cards.

== PC Card Physical Characteristics ==

{| class="regdef"
| '''Property'''
| '''Value'''
|-
|Physical Interface
|68 Pins
|-
|Back End I/O Conn.
|Proprietary
|-
|Length
|85.6 mm
|-
|Width
|54.0 mm
|-
|Thickness
|Type I (appropriate for Neo Geo) = 3.3 mm 
Type II = 5.0 mm 
Type III = 10.5 mm
|-
|Operating Temp.
|0 to 55 C
|-
|Storage Temp.
|minus 20 to 65 C
|-
|Minimum Insertions
|Office Env. 10,000 
Harsh Env. 5,000
|}

[[Image:pcc-dim.jpg]]

Memory card

2019-11-12T10:04:00Z

ArcadeTV:

[[File:snkmemcard.jpg|thumb|SRAM memory card, showing the SRAM chip and voltage detection circuit. Picture by [[User:HPMAN|HPMAN]]]]

[[File:NEO-IC8_front.jpg|thumb|NEO-IC8, original SNK card. Picture by [[User:ArcadeTV|ArcadeTV]]]]
[[File:NEO-IC8_back.jpg|thumb|NEO-IC8, back of original SNK card. Picture by [[User:ArcadeTV|ArcadeTV]]]]

The NeoGeo home console and some [[MVS hardware|MVS]] cabs can use [[JEIDA V3]] memory cards to store game saves and/or high scores, allowing players to save their progress and continue on any system running the same game.

Even if the memory card [[68k memory map|address space]] can be freely used, games should only perform memory card operations through the [[CARD]] system ROM call to avoid data corruption.

=Supported card types=

The SP-S2 [[system ROM]] (and probably all the others) can handle 8 memory card sizes from 2KiB up to 16KiB, in 2KiB steps:
*2KiB
*4KiB
*6KiB
*8KiB
*10KiB
*14KiB
*16KiB

And 4 different card types:
*8 bits wide (only the low byte is used)
*16 bits wide
*16 bits wide "doubled"
*"SNK ROM" cards

=Original SNK card=

The original SNK-branded memory card was a [[:File:CR2016_battery.jpg|battery-backed]] 8-bit wide 2KiB card using a [[LH5116|LH5116 SRAM chip]] and voltage switching circuitry.

Since it uses a battery, it may be prone to data loss if the voltage drops below 2V. It is unclear if the battery is charged up when plugged into a powered system or not.

There are at least 2 known versions of the original SNK Memory Card, each with its individual design and circuit-board: 
[[Image:NEO-IC8_versions.png|640px]]

The first version has the [[C10075-X2-2]] while the later one hase the [[EZ866]] board.

=CD systems=

A "virtual" memory card is embedded in [[CD systems]] as a 8KiB battery-backed SRAM chip.

=Data format=

All cards use the same format regardless of capacity, only regions sizes differ. Since the JEIDA data bus is 16-bits wide, make sure to double the address for 8-bit cards if you choose to access their memory directly.

The data is referred to as "blocks", one block being 64 bytes. The header always occupies the first block. Eg. A 2KiB card can hold (2048/64)-1 = 31 blocks.

The data is split into 5 regions:

==Header==

Always 64 bytes.

{|class="wikitable"
| '''Address'''
| '''Name'''
| '''Size'''
| '''Description'''
|-
|$0~$9
|
|10 bytes
|Zeros or "SNK ROM " (development unit ?)

For 16 bits "doubled" cards, $6 is set to $0001
|-
|$A
|CARD_SIZE
|word
|Address space used by the memory card. Eg. A 2KiB 8-bit card is $1000.
|-
|$C
|
|byte
|0
|-
|$D
|CARD_FAT_1_CHKSUM
|byte
|Checksum of FAT 1
|-
|$E
|CARD_FAT_2_CHKSUM
|byte
|Checksum of FAT 2
|-
|$F
|CARD_USERNAME_AVAILABLE
|byte
|0 : Username unavailable, !0 : Username available
|-
|$10
|CARD_USERNAME
|16 bytes
|Card holder's username
|-
|$20
|CARD_MAGIC
|16 bytes
|$4E $XX $45 $XX $4F $XX $2D $XX $47 $XX $45 $XX $4F $XX $80 $XX ("NEO-GEO", $80)
|-
|$30
|CARD_REGION
|byte
|Region of the system that formated the card, 0 = Japan, 1 = USA, 2 = Europe
|}

==Directory==

List of saves of 32, 64, 96, 128, 160, 192, 224 or 256 entries. The size depends on the card's capacity.

Note that since the header occupies the first block, there will always be at least one unused directory entry.

Each entry is 4 bytes, with the following format:

{| class="regdef"
| '''Address'''
| '''Size'''
| '''Description'''
|-
|$0
|byte
|Save sub-number (CARD_SUB), 0 to 15. $FF if entry is free.
|-
|$1
|word
|Game's [[NGH number]]
|-
|$3
|byte
|FAT entry index (see below)
|}

==FAT 1==

List of used blocks of 64, 128, 192, or 256 entries. The size depends on the card's capacity.
* $02 is a block reserved by the system ROM
* $01 is a block used by a game
* $00 is a free block

==FAT 2==

FAT 2 is simply a mirror of FAT 1.

If any of the FAT tables checksum is bad, the correct table is written over the other one. If both checksums are bad, the system ROM displays an error.

==Game Data==

Many games use only one block, but some may use more.

The first 20 bytes contain the data title (usually the game and stage name).

=Registers=

* Write is enabled if {{Reg|REG_CRDUNLOCK1}} and {{Reg|REG_CRDUNLOCK2}} are written to
* The WP (Write Protect) pin is read through bit 6 of {{Reg|REG_STATUS_B}}
* CD1 (Card Detect 1) is read through bit 4 of {{Reg|REG_STATUS_B}}
* CD2 (Card Detect 2) is read through bit 5 of {{Reg|REG_STATUS_B}}
** Both must be 0 if the card is inserted correctly
* Attribute memory is selected if {{Reg|REG_CRDREGSEL}} is written to, never used ?

=Pinout=

See [[Memory card pinout]].

[[Category:Cartridge systems]]

C10075-X2-2

2019-11-11T21:09:18Z

ArcadeTV: /* Battery */

[[File:neo-ic8_pcb_C10075-X2-2_front.jpg|thumb|Front of PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

[[File:neo-ic8_pcb_C10075-X2-2_front_sram-removed.jpg|thumb|Front of PCB with SRAM removed. Picture by [[User:ArcadeTV|ArcadeTV]]]]

[[File:neo-ic8_pcb_C10075-X2-2_back.jpg|thumb|Back of PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

Printed circuit board of an original SNK [[memory card]] NEO-IC8.

Found in this version of the NEO-IC8 Memory Card: 
[[Image:NEO-IC8_front.jpg|200px|NEO-IC8, original SNK card.]]

== PCB Dimensions ==

* Thickness: 0.5 mm
* Width: 46.1 mm
* Height: 51.4 mm

== Connector ==

The board uses a 68-pin connector which was manufactured by MOLEX and HIROSE among others.

* MOLEX Series: 89415 (obsolet)
* HIROSE Series: IC1 (obsolet)

[[File:HIROSE_IC1K-68RD-1.27SF.png|640px]] 
Datasheet for Hirose IC1 Series Connector:
[[File:Hirose_connector_IC1.pdf|Datasheet for Hirose IC1 Series Connector]]

== Battery ==

The is a CR2016 lithium battery with solder-tabs on the PCB which powers the [[LH5116|LH5116 SRAM chip]].
[[File:CR2016_battery.jpg|thumb|CR2016 battery found on PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

C10075-X2-2

2019-11-11T19:35:17Z

ArcadeTV:

[[File:neo-ic8_pcb_C10075-X2-2_front.jpg|thumb|Front of PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

[[File:neo-ic8_pcb_C10075-X2-2_front_sram-removed.jpg|thumb|Front of PCB with SRAM removed. Picture by [[User:ArcadeTV|ArcadeTV]]]]

[[File:neo-ic8_pcb_C10075-X2-2_back.jpg|thumb|Back of PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

Printed circuit board of an original SNK [[memory card]] NEO-IC8.

Found in this version of the NEO-IC8 Memory Card: 
[[Image:NEO-IC8_front.jpg|200px|NEO-IC8, original SNK card.]]

== PCB Dimensions ==

* Thickness: 0.5 mm
* Width: 46.1 mm
* Height: 51.4 mm

== Connector ==

The board uses a 68-pin connector which was manufactured by MOLEX and HIROSE among others.

* MOLEX Series: 89415 (obsolet)
* HIROSE Series: IC1 (obsolet)

[[File:HIROSE_IC1K-68RD-1.27SF.png|640px]] 
Datasheet for Hirose IC1 Series Connector:
[[File:Hirose_connector_IC1.pdf|Datasheet for Hirose IC1 Series Connector]]

== Battery ==

The is a CR2016 lithium battery with solder-tabs on the PCB which powers the SRAM.
[[File:CR2016_battery.jpg|thumb|CR2016 battery found on PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

Memory card

2019-11-11T16:03:03Z

ArcadeTV: /* Original SNK card */

[[File:snkmemcard.jpg|thumb|SRAM memory card, showing the SRAM chip and voltage detection circuit. Picture by [[User:HPMAN|HPMAN]]]]

[[File:NEO-IC8_front.jpg|thumb|NEO-IC8, original SNK card. Picture by [[User:ArcadeTV|ArcadeTV]]]]
[[File:NEO-IC8_back.jpg|thumb|NEO-IC8, back of original SNK card. Picture by [[User:ArcadeTV|ArcadeTV]]]]

The NeoGeo home console and some [[MVS hardware|MVS]] cabs can use JEIDA V3 memory cards to store game saves and/or high scores, allowing players to save their progress and continue on any system running the same game.

Even if the memory card [[68k memory map|address space]] can be freely used, games should only perform memory card operations through the [[CARD]] system ROM call to avoid data corruption.

=Supported card types=

The SP-S2 [[system ROM]] (and probably all the others) can handle 8 memory card sizes from 2KiB up to 16KiB, in 2KiB steps:
*2KiB
*4KiB
*6KiB
*8KiB
*10KiB
*14KiB
*16KiB

And 4 different card types:
*8 bits wide (only the low byte is used)
*16 bits wide
*16 bits wide "doubled"
*"SNK ROM" cards

=Original SNK card=

The original SNK-branded memory card was a [[:File:CR2016_battery.jpg|battery-backed]] 8-bit wide 2KiB card using a [[LH5116|LH5116 SRAM chip]] and voltage switching circuitry.

Since it uses a battery, it may be prone to data loss if the voltage drops below 2V. It is unclear if the battery is charged up when plugged into a powered system or not.

There are at least 2 known versions of the original SNK Memory Card, each with its individual design and circuit-board: 
[[Image:NEO-IC8_versions.png|640px]]

The first version has the [[C10075-X2-2]] while the later one hase the [[EZ866]] board.

=CD systems=

A "virtual" memory card is embedded in [[CD systems]] as a 8KiB battery-backed SRAM chip.

=Data format=

All cards use the same format regardless of capacity, only regions sizes differ. Since the JEIDA data bus is 16-bits wide, make sure to double the address for 8-bit cards if you choose to access their memory directly.

The data is referred to as "blocks", one block being 64 bytes. The header always occupies the first block. Eg. A 2KiB card can hold (2048/64)-1 = 31 blocks.

The data is split into 5 regions:

==Header==

Always 64 bytes.

{|class="wikitable"
| '''Address'''
| '''Name'''
| '''Size'''
| '''Description'''
|-
|$0~$9
|
|10 bytes
|Zeros or "SNK ROM " (development unit ?)

For 16 bits "doubled" cards, $6 is set to $0001
|-
|$A
|CARD_SIZE
|word
|Address space used by the memory card. Eg. A 2KiB 8-bit card is $1000.
|-
|$C
|
|byte
|0
|-
|$D
|CARD_FAT_1_CHKSUM
|byte
|Checksum of FAT 1
|-
|$E
|CARD_FAT_2_CHKSUM
|byte
|Checksum of FAT 2
|-
|$F
|CARD_USERNAME_AVAILABLE
|byte
|0 : Username unavailable, !0 : Username available
|-
|$10
|CARD_USERNAME
|16 bytes
|Card holder's username
|-
|$20
|CARD_MAGIC
|16 bytes
|$4E $XX $45 $XX $4F $XX $2D $XX $47 $XX $45 $XX $4F $XX $80 $XX ("NEO-GEO", $80)
|-
|$30
|CARD_REGION
|byte
|Region of the system that formated the card, 0 = Japan, 1 = USA, 2 = Europe
|}

==Directory==

List of saves of 32, 64, 96, 128, 160, 192, 224 or 256 entries. The size depends on the card's capacity.

Note that since the header occupies the first block, there will always be at least one unused directory entry.

Each entry is 4 bytes, with the following format:

{| class="regdef"
| '''Address'''
| '''Size'''
| '''Description'''
|-
|$0
|byte
|Save sub-number (CARD_SUB), 0 to 15. $FF if entry is free.
|-
|$1
|word
|Game's [[NGH number]]
|-
|$3
|byte
|FAT entry index (see below)
|}

==FAT 1==

List of used blocks of 64, 128, 192, or 256 entries. The size depends on the card's capacity.
* $02 is a block reserved by the system ROM
* $01 is a block used by a game
* $00 is a free block

==FAT 2==

FAT 2 is simply a mirror of FAT 1.

If any of the FAT tables checksum is bad, the correct table is written over the other one. If both checksums are bad, the system ROM displays an error.

==Game Data==

Many games use only one block, but some may use more.

The first 20 bytes contain the data title (usually the game and stage name).

=Registers=

* Write is enabled if {{Reg|REG_CRDUNLOCK1}} and {{Reg|REG_CRDUNLOCK2}} are written to
* The WP (Write Protect) pin is read through bit 6 of {{Reg|REG_STATUS_B}}
* CD1 (Card Detect 1) is read through bit 4 of {{Reg|REG_STATUS_B}}
* CD2 (Card Detect 2) is read through bit 5 of {{Reg|REG_STATUS_B}}
** Both must be 0 if the card is inserted correctly
* Attribute memory is selected if {{Reg|REG_CRDREGSEL}} is written to, never used ?

=Pinout=

See [[Memory card pinout]].

[[Category:Cartridge systems]]

Memory card

2019-11-11T16:02:30Z

ArcadeTV: /* Original SNK card */

[[File:snkmemcard.jpg|thumb|SRAM memory card, showing the SRAM chip and voltage detection circuit. Picture by [[User:HPMAN|HPMAN]]]]

[[File:NEO-IC8_front.jpg|thumb|NEO-IC8, original SNK card. Picture by [[User:ArcadeTV|ArcadeTV]]]]
[[File:NEO-IC8_back.jpg|thumb|NEO-IC8, back of original SNK card. Picture by [[User:ArcadeTV|ArcadeTV]]]]

The NeoGeo home console and some [[MVS hardware|MVS]] cabs can use JEIDA V3 memory cards to store game saves and/or high scores, allowing players to save their progress and continue on any system running the same game.

Even if the memory card [[68k memory map|address space]] can be freely used, games should only perform memory card operations through the [[CARD]] system ROM call to avoid data corruption.

=Supported card types=

The SP-S2 [[system ROM]] (and probably all the others) can handle 8 memory card sizes from 2KiB up to 16KiB, in 2KiB steps:
*2KiB
*4KiB
*6KiB
*8KiB
*10KiB
*14KiB
*16KiB

And 4 different card types:
*8 bits wide (only the low byte is used)
*16 bits wide
*16 bits wide "doubled"
*"SNK ROM" cards

=Original SNK card=

The original SNK-branded memory card was a [[:File:CR2016_battery.jpg|battery-backed]] 8-bit wide 2KiB card using a [[LH5116|LH5116 SRAM chip]] and voltage switching circuitry.

Since it uses a battery, it may be prone to data loss if the voltage drops below 2V. It is unclear if the battery is charged up when plugged into a powered system or not.

There are at least 2 known versions of the original SNK Memory Card, each with its individual design and circuit-board: 
[[Image:NEO-IC8_versions.png]]

The first version has the [[C10075-X2-2]] while the later one hase the [[EZ866]] board.

=CD systems=

A "virtual" memory card is embedded in [[CD systems]] as a 8KiB battery-backed SRAM chip.

=Data format=

All cards use the same format regardless of capacity, only regions sizes differ. Since the JEIDA data bus is 16-bits wide, make sure to double the address for 8-bit cards if you choose to access their memory directly.

The data is referred to as "blocks", one block being 64 bytes. The header always occupies the first block. Eg. A 2KiB card can hold (2048/64)-1 = 31 blocks.

The data is split into 5 regions:

==Header==

Always 64 bytes.

{|class="wikitable"
| '''Address'''
| '''Name'''
| '''Size'''
| '''Description'''
|-
|$0~$9
|
|10 bytes
|Zeros or "SNK ROM " (development unit ?)

For 16 bits "doubled" cards, $6 is set to $0001
|-
|$A
|CARD_SIZE
|word
|Address space used by the memory card. Eg. A 2KiB 8-bit card is $1000.
|-
|$C
|
|byte
|0
|-
|$D
|CARD_FAT_1_CHKSUM
|byte
|Checksum of FAT 1
|-
|$E
|CARD_FAT_2_CHKSUM
|byte
|Checksum of FAT 2
|-
|$F
|CARD_USERNAME_AVAILABLE
|byte
|0 : Username unavailable, !0 : Username available
|-
|$10
|CARD_USERNAME
|16 bytes
|Card holder's username
|-
|$20
|CARD_MAGIC
|16 bytes
|$4E $XX $45 $XX $4F $XX $2D $XX $47 $XX $45 $XX $4F $XX $80 $XX ("NEO-GEO", $80)
|-
|$30
|CARD_REGION
|byte
|Region of the system that formated the card, 0 = Japan, 1 = USA, 2 = Europe
|}

==Directory==

List of saves of 32, 64, 96, 128, 160, 192, 224 or 256 entries. The size depends on the card's capacity.

Note that since the header occupies the first block, there will always be at least one unused directory entry.

Each entry is 4 bytes, with the following format:

{| class="regdef"
| '''Address'''
| '''Size'''
| '''Description'''
|-
|$0
|byte
|Save sub-number (CARD_SUB), 0 to 15. $FF if entry is free.
|-
|$1
|word
|Game's [[NGH number]]
|-
|$3
|byte
|FAT entry index (see below)
|}

==FAT 1==

List of used blocks of 64, 128, 192, or 256 entries. The size depends on the card's capacity.
* $02 is a block reserved by the system ROM
* $01 is a block used by a game
* $00 is a free block

==FAT 2==

FAT 2 is simply a mirror of FAT 1.

If any of the FAT tables checksum is bad, the correct table is written over the other one. If both checksums are bad, the system ROM displays an error.

==Game Data==

Many games use only one block, but some may use more.

The first 20 bytes contain the data title (usually the game and stage name).

=Registers=

* Write is enabled if {{Reg|REG_CRDUNLOCK1}} and {{Reg|REG_CRDUNLOCK2}} are written to
* The WP (Write Protect) pin is read through bit 6 of {{Reg|REG_STATUS_B}}
* CD1 (Card Detect 1) is read through bit 4 of {{Reg|REG_STATUS_B}}
* CD2 (Card Detect 2) is read through bit 5 of {{Reg|REG_STATUS_B}}
** Both must be 0 if the card is inserted correctly
* Attribute memory is selected if {{Reg|REG_CRDREGSEL}} is written to, never used ?

=Pinout=

See [[Memory card pinout]].

[[Category:Cartridge systems]]

File:NEO-IC8 versions.png

2019-11-11T16:01:43Z

ArcadeTV:

== Licensing ==
{{Non-free game cover}}

File:NEO-IC8 versions.svg

2019-11-11T15:59:53Z

ArcadeTV: ArcadeTV uploaded a new version of File:NEO-IC8 versions.svg

== Summary ==
Vector graphic of the memory cards created by ArcadeTV.
== Licensing ==
{{Non-free game cover}}

File:NEO-IC8 versions.svg

2019-11-11T15:59:34Z

ArcadeTV: ArcadeTV uploaded a new version of File:NEO-IC8 versions.svg

== Summary ==
Vector graphic of the memory cards created by ArcadeTV.
== Licensing ==
{{Non-free game cover}}

File:NEO-IC8 versions.svg

2019-11-11T15:47:45Z

ArcadeTV: ArcadeTV uploaded a new version of File:NEO-IC8 versions.svg

== Summary ==
Vector graphic of the memory cards created by ArcadeTV.
== Licensing ==
{{Non-free game cover}}

File:NEO-IC8 versions.svg

2019-11-11T15:45:06Z

ArcadeTV: ArcadeTV uploaded a new version of File:NEO-IC8 versions.svg

== Summary ==
Vector graphic of the memory cards created by ArcadeTV.
== Licensing ==
{{Non-free game cover}}

Memory card

2019-11-11T15:40:36Z

ArcadeTV: /* Original SNK card */

[[File:snkmemcard.jpg|thumb|SRAM memory card, showing the SRAM chip and voltage detection circuit. Picture by [[User:HPMAN|HPMAN]]]]

[[File:NEO-IC8_front.jpg|thumb|NEO-IC8, original SNK card. Picture by [[User:ArcadeTV|ArcadeTV]]]]
[[File:NEO-IC8_back.jpg|thumb|NEO-IC8, back of original SNK card. Picture by [[User:ArcadeTV|ArcadeTV]]]]

The NeoGeo home console and some [[MVS hardware|MVS]] cabs can use JEIDA V3 memory cards to store game saves and/or high scores, allowing players to save their progress and continue on any system running the same game.

Even if the memory card [[68k memory map|address space]] can be freely used, games should only perform memory card operations through the [[CARD]] system ROM call to avoid data corruption.

=Supported card types=

The SP-S2 [[system ROM]] (and probably all the others) can handle 8 memory card sizes from 2KiB up to 16KiB, in 2KiB steps:
*2KiB
*4KiB
*6KiB
*8KiB
*10KiB
*14KiB
*16KiB

And 4 different card types:
*8 bits wide (only the low byte is used)
*16 bits wide
*16 bits wide "doubled"
*"SNK ROM" cards

=Original SNK card=

The original SNK-branded memory card was a [[:File:CR2016_battery.jpg|battery-backed]] 8-bit wide 2KiB card using a [[LH5116|LH5116 SRAM chip]] and voltage switching circuitry.

Since it uses a battery, it may be prone to data loss if the voltage drops below 2V. It is unclear if the battery is charged up when plugged into a powered system or not.

There are at least 2 known versions of the original SNK Memory Card, each with its individual design and circuit-board: 
[[Image:NEO-IC8_versions.svg]]

The first version has the [[C10075-X2-2]] while the later one hase the [[EZ866]] board.

=CD systems=

A "virtual" memory card is embedded in [[CD systems]] as a 8KiB battery-backed SRAM chip.

=Data format=

All cards use the same format regardless of capacity, only regions sizes differ. Since the JEIDA data bus is 16-bits wide, make sure to double the address for 8-bit cards if you choose to access their memory directly.

The data is referred to as "blocks", one block being 64 bytes. The header always occupies the first block. Eg. A 2KiB card can hold (2048/64)-1 = 31 blocks.

The data is split into 5 regions:

==Header==

Always 64 bytes.

{|class="wikitable"
| '''Address'''
| '''Name'''
| '''Size'''
| '''Description'''
|-
|$0~$9
|
|10 bytes
|Zeros or "SNK ROM " (development unit ?)

For 16 bits "doubled" cards, $6 is set to $0001
|-
|$A
|CARD_SIZE
|word
|Address space used by the memory card. Eg. A 2KiB 8-bit card is $1000.
|-
|$C
|
|byte
|0
|-
|$D
|CARD_FAT_1_CHKSUM
|byte
|Checksum of FAT 1
|-
|$E
|CARD_FAT_2_CHKSUM
|byte
|Checksum of FAT 2
|-
|$F
|CARD_USERNAME_AVAILABLE
|byte
|0 : Username unavailable, !0 : Username available
|-
|$10
|CARD_USERNAME
|16 bytes
|Card holder's username
|-
|$20
|CARD_MAGIC
|16 bytes
|$4E $XX $45 $XX $4F $XX $2D $XX $47 $XX $45 $XX $4F $XX $80 $XX ("NEO-GEO", $80)
|-
|$30
|CARD_REGION
|byte
|Region of the system that formated the card, 0 = Japan, 1 = USA, 2 = Europe
|}

==Directory==

List of saves of 32, 64, 96, 128, 160, 192, 224 or 256 entries. The size depends on the card's capacity.

Note that since the header occupies the first block, there will always be at least one unused directory entry.

Each entry is 4 bytes, with the following format:

{| class="regdef"
| '''Address'''
| '''Size'''
| '''Description'''
|-
|$0
|byte
|Save sub-number (CARD_SUB), 0 to 15. $FF if entry is free.
|-
|$1
|word
|Game's [[NGH number]]
|-
|$3
|byte
|FAT entry index (see below)
|}

==FAT 1==

List of used blocks of 64, 128, 192, or 256 entries. The size depends on the card's capacity.
* $02 is a block reserved by the system ROM
* $01 is a block used by a game
* $00 is a free block

==FAT 2==

FAT 2 is simply a mirror of FAT 1.

If any of the FAT tables checksum is bad, the correct table is written over the other one. If both checksums are bad, the system ROM displays an error.

==Game Data==

Many games use only one block, but some may use more.

The first 20 bytes contain the data title (usually the game and stage name).

=Registers=

* Write is enabled if {{Reg|REG_CRDUNLOCK1}} and {{Reg|REG_CRDUNLOCK2}} are written to
* The WP (Write Protect) pin is read through bit 6 of {{Reg|REG_STATUS_B}}
* CD1 (Card Detect 1) is read through bit 4 of {{Reg|REG_STATUS_B}}
* CD2 (Card Detect 2) is read through bit 5 of {{Reg|REG_STATUS_B}}
** Both must be 0 if the card is inserted correctly
* Attribute memory is selected if {{Reg|REG_CRDREGSEL}} is written to, never used ?

=Pinout=

See [[Memory card pinout]].

[[Category:Cartridge systems]]

File:NEO-IC8 versions.svg

2019-11-11T15:39:55Z

ArcadeTV: Vector graphic of the memory cards created by ArcadeTV.

== Summary ==
Vector graphic of the memory cards created by ArcadeTV.
== Licensing ==
{{Non-free game cover}}

C10075-X2-2

2019-11-11T15:25:54Z

ArcadeTV:

[[File:neo-ic8_pcb_C10075-X2-2_front.jpg|thumb|Front of PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

[[File:neo-ic8_pcb_C10075-X2-2_front_sram-removed.jpg|thumb|Front of PCB with SRAM removed. Picture by [[User:ArcadeTV|ArcadeTV]]]]

[[File:neo-ic8_pcb_C10075-X2-2_back.jpg|thumb|Back of PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

Printed circuit board of an original SNK [[memory card]] NEO-IC8.

Found in this version of the NEO-IC8 Memory Card: 
[[Image:NEO-IC8_front.jpg|200px|NEO-IC8, original SNK card.]]

== PCB Dimensions ==

* Thickness: 0.5 mm
* Width: 46.1 mm
* Height: 51.4 mm

== Connector ==

The board uses a 68-pin connector which was manufactured by MOLEX and HIROSE among others.

* MOLEX Series: 89415 (obsolet)
* HIROSE Series: IC1 (obsolet)

[[File:HIROSE_IC1K-68RD-1.27SF.png|640px|[[File:Hirose_connector_IC1.pdf|Datasheet:Hirose IC1 Series Connector]]]]

== Battery ==

The is a CR2016 lithium battery with solder-tabs on the PCB which powers the SRAM.
[[File:CR2016_battery.jpg|thumb|CR2016 battery found on PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

C10075-X2-2

2019-11-11T15:18:15Z

ArcadeTV:

[[File:neo-ic8_pcb_C10075-X2-2_front.jpg|thumb|Front of PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

[[File:neo-ic8_pcb_C10075-X2-2_front_sram-removed.jpg|thumb|Front of PCB with SRAM removed. Picture by [[User:ArcadeTV|ArcadeTV]]]]

[[File:neo-ic8_pcb_C10075-X2-2_back.jpg|thumb|Back of PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

Printed circuit board of an original SNK [[memory card]] NEO-IC8.

Found in this version of the NEO-IC8 Memory Card: 
[[Image:NEO-IC8_front.jpg|200px|NEO-IC8, original SNK card.]]

== PCB Dimensions ==

* Thickness: 0.5 mm
* Width: 46.1 mm
* Height: 51.4 mm

== Connector ==

The board uses a 68-pin connector which was manufactured by MOLEX and HIROSE among others.

* MOLEX Series: 89415 (obsolet)
* HIROSE Series: IC1 (obsolet)

[[File:HIROSE_IC1K-68RD-1.27SF.png|thumb|[[File:Hirose_connector_IC1.pdf|Datasheet:Hirose IC1 Series Connector]]]]

== Battery ==

The is a CR2016 lithium battery with solder-tabs on the PCB which powers the SRAM.
[[File:CR2016_battery.jpg|thumb|CR2016 battery found on PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

File:Hirose connector IC1.pdf

2019-11-11T15:17:11Z

ArcadeTV:

File:HIROSE IC1K-68RD-1.27SF.png

2019-11-11T15:16:36Z

ArcadeTV:

C10075-X2-2

2019-11-11T15:16:18Z

ArcadeTV:

[[File:neo-ic8_pcb_C10075-X2-2_front.jpg|thumb|Front of PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

[[File:neo-ic8_pcb_C10075-X2-2_front_sram-removed.jpg|thumb|Front of PCB with SRAM removed. Picture by [[User:ArcadeTV|ArcadeTV]]]]

[[File:neo-ic8_pcb_C10075-X2-2_back.jpg|thumb|Back of PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

Printed circuit board of an original SNK [[memory card]] NEO-IC8.

Found in this version of the NEO-IC8 Memory Card: 
[[Image:NEO-IC8_front.jpg|200px|NEO-IC8, original SNK card.]]

== Dimensions ==

* Thickness: 0.5 mm
* Width: 46.1 mm
* Height: 51.4 mm

== Connector ==

The board uses a 68-pin connector which was manufactured by MOLEX and HIROSE among others.

* MOLEX Series: 89415 (obsolet)
* HIROSE Series: IC1 (obsolet)

[[File:HIROSE_IC1K-68RD-1.27SF.png|thumb|[[File:Hirose_connector_IC1.pdf|Datasheet:Hirose IC1 Series Connector]]]]

== Battery ==

The is a CR2016 lithium battery with solder-tabs on the PCB which powers the SRAM.
[[File:CR2016_battery.jpg|thumb|CR2016 battery found on PCB. Picture by [[User:ArcadeTV|ArcadeTV]]]]

Memory card

2019-11-11T13:20:09Z

ArcadeTV: /* Original SNK card */

[[File:snkmemcard.jpg|thumb|SRAM memory card, showing the SRAM chip and voltage detection circuit. Picture by [[User:HPMAN|HPMAN]]]]

[[File:NEO-IC8_front.jpg|thumb|NEO-IC8, original SNK card. Picture by [[User:ArcadeTV|ArcadeTV]]]]
[[File:NEO-IC8_back.jpg|thumb|NEO-IC8, back of original SNK card. Picture by [[User:ArcadeTV|ArcadeTV]]]]

The NeoGeo home console and some [[MVS hardware|MVS]] cabs can use JEIDA V3 memory cards to store game saves and/or high scores, allowing players to save their progress and continue on any system running the same game.

Even if the memory card [[68k memory map|address space]] can be freely used, games should only perform memory card operations through the [[CARD]] system ROM call to avoid data corruption.

=Supported card types=

The SP-S2 [[system ROM]] (and probably all the others) can handle 8 memory card sizes from 2KiB up to 16KiB, in 2KiB steps:
*2KiB
*4KiB
*6KiB
*8KiB
*10KiB
*14KiB
*16KiB

And 4 different card types:
*8 bits wide (only the low byte is used)
*16 bits wide
*16 bits wide "doubled"
*"SNK ROM" cards

=Original SNK card=

The original SNK-branded memory card was a [[:File:CR2016_battery.jpg|battery-backed]] 8-bit wide 2KiB card using a [[LH5116|LH5116 SRAM chip]] and voltage switching circuitry.

Since it uses a battery, it may be prone to data loss if the voltage drops below 2V. It is unclear if the battery is charged up when plugged into a powered system or not.

=CD systems=

A "virtual" memory card is embedded in [[CD systems]] as a 8KiB battery-backed SRAM chip.

=Data format=

All cards use the same format regardless of capacity, only regions sizes differ. Since the JEIDA data bus is 16-bits wide, make sure to double the address for 8-bit cards if you choose to access their memory directly.

The data is referred to as "blocks", one block being 64 bytes. The header always occupies the first block. Eg. A 2KiB card can hold (2048/64)-1 = 31 blocks.

The data is split into 5 regions:

==Header==

Always 64 bytes.

{|class="wikitable"
| '''Address'''
| '''Name'''
| '''Size'''
| '''Description'''
|-
|$0~$9
|
|10 bytes
|Zeros or "SNK ROM " (development unit ?)

For 16 bits "doubled" cards, $6 is set to $0001
|-
|$A
|CARD_SIZE
|word
|Address space used by the memory card. Eg. A 2KiB 8-bit card is $1000.
|-
|$C
|
|byte
|0
|-
|$D
|CARD_FAT_1_CHKSUM
|byte
|Checksum of FAT 1
|-
|$E
|CARD_FAT_2_CHKSUM
|byte
|Checksum of FAT 2
|-
|$F
|CARD_USERNAME_AVAILABLE
|byte
|0 : Username unavailable, !0 : Username available
|-
|$10
|CARD_USERNAME
|16 bytes
|Card holder's username
|-
|$20
|CARD_MAGIC
|16 bytes
|$4E $XX $45 $XX $4F $XX $2D $XX $47 $XX $45 $XX $4F $XX $80 $XX ("NEO-GEO", $80)
|-
|$30
|CARD_REGION
|byte
|Region of the system that formated the card, 0 = Japan, 1 = USA, 2 = Europe
|}

==Directory==

List of saves of 32, 64, 96, 128, 160, 192, 224 or 256 entries. The size depends on the card's capacity.

Note that since the header occupies the first block, there will always be at least one unused directory entry.

Each entry is 4 bytes, with the following format:

{| class="regdef"
| '''Address'''
| '''Size'''
| '''Description'''
|-
|$0
|byte
|Save sub-number (CARD_SUB), 0 to 15. $FF if entry is free.
|-
|$1
|word
|Game's [[NGH number]]
|-
|$3
|byte
|FAT entry index (see below)
|}

==FAT 1==

List of used blocks of 64, 128, 192, or 256 entries. The size depends on the card's capacity.
* $02 is a block reserved by the system ROM
* $01 is a block used by a game
* $00 is a free block

==FAT 2==

FAT 2 is simply a mirror of FAT 1.

If any of the FAT tables checksum is bad, the correct table is written over the other one. If both checksums are bad, the system ROM displays an error.

==Game Data==

Many games use only one block, but some may use more.

The first 20 bytes contain the data title (usually the game and stage name).

=Registers=

* Write is enabled if {{Reg|REG_CRDUNLOCK1}} and {{Reg|REG_CRDUNLOCK2}} are written to
* The WP (Write Protect) pin is read through bit 6 of {{Reg|REG_STATUS_B}}
* CD1 (Card Detect 1) is read through bit 4 of {{Reg|REG_STATUS_B}}
* CD2 (Card Detect 2) is read through bit 5 of {{Reg|REG_STATUS_B}}
** Both must be 0 if the card is inserted correctly
* Attribute memory is selected if {{Reg|REG_CRDREGSEL}} is written to, never used ?

=Pinout=

See [[Memory card pinout]].

[[Category:Cartridge systems]]

LH5116

2019-11-11T13:14:19Z

ArcadeTV:

[[File:LH5116NA-10.jpg|thumb|SHARP LH5116NA-10 SRAM IC. Picture by [[User:ArcadeTV|ArcadeTV]]]]
The LH5116/H are static RAMs organized as 2,048 x 8bits. It is fabricated using silicon-gate CMOS process technology. It features high speed access in read mode using output enable (tOE).

== FEATURES ==
* 2,048 x 8 bit organization
* Access time: 100 ns (MAX.)
* Power consumption: 
Operating: 220 mW (MAX.) 
Standby: 5.5 mW (MAX.)
* Single +5 V power supply
* Fully-static operation
* TTL compatible I/O
* Three-state outputs
* Wide temperature range available 
LH5116H: -40 to +85°C
* Packages:
24-pin, 600-mil DIP 
24-pin, 300-mil SK-DIP 
24-pin, 450-mil SOP

== DATASHEET ==
[[File:LH511610.pdf]]

LH5116

2019-11-11T13:13:42Z

ArcadeTV: /* FEATURES */

[[File:LH5116NA-10.jpg|thumb|SHARP LH5116NA-10 SRAM IC. Picture by [[User:ArcadeTV|ArcadeTV]]]]
The LH5116/H are static RAMs organized as 2,048 ´ 8bits. It is fabricated using silicon-gate CMOS process technology. It features high speed access in read mode using output enable (tOE).

== FEATURES ==
* 2,048 x 8 bit organization
* Access time: 100 ns (MAX.)
* Power consumption: 
Operating: 220 mW (MAX.) 
Standby: 5.5 mW (MAX.)
* Single +5 V power supply
* Fully-static operation
* TTL compatible I/O
* Three-state outputs
* Wide temperature range available 
LH5116H: -40 to +85°C
* Packages:
24-pin, 600-mil DIP 
24-pin, 300-mil SK-DIP 
24-pin, 450-mil SOP

== DATASHEET ==
[[File:LH511610.pdf]]

LH5116

2019-11-11T13:04:12Z

ArcadeTV: Created page with "ArcadeTV]] The LH5116/H are static RAMs organized as 2,048 ´ 8bits. It is fabricated usin..."

[[File:LH5116NA-10.jpg|thumb|SHARP LH5116NA-10 SRAM IC. Picture by [[User:ArcadeTV|ArcadeTV]]]]
The LH5116/H are static RAMs organized as 2,048 ´ 8bits. It is fabricated using silicon-gate CMOS process technology. It features high speed access in read mode using output enable (tOE).

== FEATURES ==
* 2,048 ´ 8 bit organization
* Access time: 100 ns (MAX.)
* Power consumption: 
Operating: 220 mW (MAX.) 
Standby: 5.5 mW (MAX.)
* Single +5 V power supply
* Fully-static operation
* TTL compatible I/O
* Three-state outputs
* Wide temperature range available 
LH5116H: -40 to +85°C
* Packages:
24-pin, 600-mil DIP 
24-pin, 300-mil SK-DIP 
24-pin, 450-mil SOP

== DATASHEET ==
[[File:LH511610.pdf]]

File:LH5116NA-10.jpg

2019-11-11T13:03:52Z

ArcadeTV: SHARP LH5116NA-10 SRAM IC

== Summary ==
SHARP LH5116NA-10 SRAM IC

File:LH511610.pdf

2019-11-11T13:03:06Z

ArcadeTV:

C10075-X2-2

2019-11-11T10:41:38Z

ArcadeTV:

File:CR2016 battery.jpg

2019-11-11T10:26:05Z

ArcadeTV: Panasonic CR2016 3V lithium battery with solder tabs found on the printed circuit board C10075-X2-2 inside an original SNK memory card NEO-IC8.

== Summary ==
Panasonic CR2016 3V lithium battery with solder tabs found on the printed circuit board C10075-X2-2 inside an original SNK memory card NEO-IC8.

C10075-X2-2

2019-11-11T10:22:00Z

ArcadeTV: Created page with "ArcadeTV]] File:neo-ic8_pcb_C10075-X2-2_front_sram-removed.jpg|thumb|Front of PCB..."

File:Neo-ic8 pcb C10075-X2-2 back.jpg

2019-11-11T10:13:32Z

ArcadeTV:

File:Neo-ic8 pcb C10075-X2-2 front sram-removed.jpg

2019-11-11T10:13:23Z

ArcadeTV:

File:Neo-ic8 pcb C10075-X2-2 front.jpg

2019-11-11T10:13:06Z

ArcadeTV:

File:NEO-IC8 back.jpg

2019-11-11T10:01:03Z

ArcadeTV: /* Summary */

== Summary ==
Back of original SNK Memory Card NEO-IC8 (Version 1).

=== Text on the cover ===

ご注意
*高温・直射日光はさけて下さい。
*曲げたり、強いショックを与えないで下さい。
*水に濡らさないで下さい。
*コネクター部に手など触れないで下さい。
*火中への投入は、絶対にしないで下さい。
株式会社エス・エヌ・ケイ 
MADE IN JAPAN

=== Translation ===

Please Note
*Avoid high temperatures and direct sunlight.
*Do not bend or give a strong shock.
*Do not wet in water.
*Do not touch the connector with your hands.
*Never throw it into fire.
SNK Corporation 
MADE IN JAPAN

== Licensing ==
{{Non-free game cover}}

Memory card

2019-11-11T09:51:11Z

ArcadeTV:

[[File:snkmemcard.jpg|thumb|SRAM memory card, showing the SRAM chip and voltage detection circuit. Picture by [[User:HPMAN|HPMAN]]]]

[[File:NEO-IC8_front.jpg|thumb|NEO-IC8, original SNK card. Picture by [[User:ArcadeTV|ArcadeTV]]]]
[[File:NEO-IC8_back.jpg|thumb|NEO-IC8, back of original SNK card. Picture by [[User:ArcadeTV|ArcadeTV]]]]

The NeoGeo home console and some [[MVS hardware|MVS]] cabs can use JEIDA V3 memory cards to store game saves and/or high scores, allowing players to save their progress and continue on any system running the same game.

Even if the memory card [[68k memory map|address space]] can be freely used, games should only perform memory card operations through the [[CARD]] system ROM call to avoid data corruption.

=Supported card types=

The SP-S2 [[system ROM]] (and probably all the others) can handle 8 memory card sizes from 2KiB up to 16KiB, in 2KiB steps:
*2KiB
*4KiB
*6KiB
*8KiB
*10KiB
*14KiB
*16KiB

And 4 different card types:
*8 bits wide (only the low byte is used)
*16 bits wide
*16 bits wide "doubled"
*"SNK ROM" cards

=Original SNK card=

The original SNK-branded memory card was a battery-backed 8-bit wide 2KiB card using a LH5116 SRAM chip and voltage switching circuitry.

Since it uses a battery, it may be prone to data loss if the voltage drops below 2V. It is unclear if the battery is charged up when plugged into a powered system or not.

=CD systems=

A "virtual" memory card is embedded in [[CD systems]] as a 8KiB battery-backed SRAM chip.

=Data format=

All cards use the same format regardless of capacity, only regions sizes differ. Since the JEIDA data bus is 16-bits wide, make sure to double the address for 8-bit cards if you choose to access their memory directly.

The data is referred to as "blocks", one block being 64 bytes. The header always occupies the first block. Eg. A 2KiB card can hold (2048/64)-1 = 31 blocks.

The data is split into 5 regions:

==Header==

Always 64 bytes.

{|class="wikitable"
| '''Address'''
| '''Name'''
| '''Size'''
| '''Description'''
|-
|$0~$9
|
|10 bytes
|Zeros or "SNK ROM " (development unit ?)

For 16 bits "doubled" cards, $6 is set to $0001
|-
|$A
|CARD_SIZE
|word
|Address space used by the memory card. Eg. A 2KiB 8-bit card is $1000.
|-
|$C
|
|byte
|0
|-
|$D
|CARD_FAT_1_CHKSUM
|byte
|Checksum of FAT 1
|-
|$E
|CARD_FAT_2_CHKSUM
|byte
|Checksum of FAT 2
|-
|$F
|CARD_USERNAME_AVAILABLE
|byte
|0 : Username unavailable, !0 : Username available
|-
|$10
|CARD_USERNAME
|16 bytes
|Card holder's username
|-
|$20
|CARD_MAGIC
|16 bytes
|$4E $XX $45 $XX $4F $XX $2D $XX $47 $XX $45 $XX $4F $XX $80 $XX ("NEO-GEO", $80)
|-
|$30
|CARD_REGION
|byte
|Region of the system that formated the card, 0 = Japan, 1 = USA, 2 = Europe
|}

==Directory==

List of saves of 32, 64, 96, 128, 160, 192, 224 or 256 entries. The size depends on the card's capacity.

Note that since the header occupies the first block, there will always be at least one unused directory entry.

Each entry is 4 bytes, with the following format:

{| class="regdef"
| '''Address'''
| '''Size'''
| '''Description'''
|-
|$0
|byte
|Save sub-number (CARD_SUB), 0 to 15. $FF if entry is free.
|-
|$1
|word
|Game's [[NGH number]]
|-
|$3
|byte
|FAT entry index (see below)
|}

==FAT 1==

List of used blocks of 64, 128, 192, or 256 entries. The size depends on the card's capacity.
* $02 is a block reserved by the system ROM
* $01 is a block used by a game
* $00 is a free block

==FAT 2==

FAT 2 is simply a mirror of FAT 1.

If any of the FAT tables checksum is bad, the correct table is written over the other one. If both checksums are bad, the system ROM displays an error.

==Game Data==

Many games use only one block, but some may use more.

The first 20 bytes contain the data title (usually the game and stage name).

=Registers=

* Write is enabled if {{Reg|REG_CRDUNLOCK1}} and {{Reg|REG_CRDUNLOCK2}} are written to
* The WP (Write Protect) pin is read through bit 6 of {{Reg|REG_STATUS_B}}
* CD1 (Card Detect 1) is read through bit 4 of {{Reg|REG_STATUS_B}}
* CD2 (Card Detect 2) is read through bit 5 of {{Reg|REG_STATUS_B}}
** Both must be 0 if the card is inserted correctly
* Attribute memory is selected if {{Reg|REG_CRDREGSEL}} is written to, never used ?

=Pinout=

See [[Memory card pinout]].

[[Category:Cartridge systems]]

File:NEO-IC8 back.jpg

2019-11-11T09:48:55Z

ArcadeTV: Back of original SNK Memory Card NEO-IC8 (Version 1).

== Summary ==
Back of original SNK Memory Card NEO-IC8 (Version 1).

== Licensing ==
{{Non-free game cover}}

File:NEO-IC8 front.jpg

2019-11-11T09:47:21Z

ArcadeTV: Front of original SNK Memory Card NEO-IC8 (Version 1)

== Summary ==
Front of original SNK Memory Card NEO-IC8 (Version 1)
== Licensing ==
{{Non-free game cover}}