BIOS RAM locations

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Address DEF name Size Set by Description
$10FD80 BIOS_SYSTEM_MODE byte BIOS 0:system mode, 1:game mode
$10FD82 BIOS_MVS_FLAG byte BIOS 0:AES, 1:MVS
$10FD83 BIOS_COUNTRY_CODE byte BIOS 0:Japan, 1:USA, 2:Europe
$10FD84~$10FD93 BIOS_GAME_DIP 16 bytes BIOS Software DIPs values
$10FD94 BIOS_P1STATUS byte BIOS 0:no connection, 1:normal joypad, 2:expanded joypad, 3:Mahjong controller, 4:Keyboard
$10FD95 BIOS_P1PREVIOUS byte BIOS DCBA Right Left Bottom Top (positive logic)
$10FD96 BIOS_P1CURRENT byte BIOS DCBA Right Left Bottom Top (positive logic)
$10FD97 BIOS_P1CHANGE byte BIOS Active edge DCBA Right Left Bottom Top (positive logic)
$10FD98 BIOS_P1REPEAT byte BIOS Active edge + repeat every 8 frames after 16 frames. DCBA Right Left Bottom Top (positive logic)
$10FD99 BIOS_P1TIMER byte BIOS Countdown ?
$10FD9A~$10FD9F Same for P2 5 bytes BIOS See above
$10FDA0~$10FDA6 Same for P3 5 bytes BIOS See above
$10FDA7~$10FDAB Same for P4 5 bytes BIOS See above
$10FDAC BIOS_STATCURNT byte BIOS Select P4, Start P4, Select P3, Start P3, Select P2, Start P2, Select P1, Start P1 (positive logic)
$10FDAD BIOS_STATCHANGE byte BIOS Select P4, Start P4, Select P3, Start P3, Select P2, Start P2, Select P1, Start P1 (positive logic)
$10FDAE BIOS_USER_REQUEST byte BIOS Set by the USER subroutine. 0:Init, 1:Boot animation, 2:Demo, 3:Title
$10FDAF BIOS_USER_MODE byte Game 0:Init/Boot animation, 1:Title/Demo, 3:Game
$10FDB0 BIOS_CREDIT_DEC 4 bytes Game Credit decrement value for each player when calling CREDIT DOWN.
$10FDB4 BIOS_START_FLAG byte BIOS Used when calling the PLAYER START subroutine. Last 4 bits correspond to the player who pushed start.
$10FDB6 BIOS_PLAYER_MOD 4 bytes Game Sets player status. 0:Never played, 1:Playing, 2:Continue option being displayed, 3:Game over
$10FDBE BIOS_MESS_POINT longword Game MESS_OUT buffer pointer
$10FDC2 BIOS_MESS_BUSY byte Game 0:Allow MESS_OUT, 1:Skip MESS_OUT
Memory card related

BIOS_CRDF equ $10FDC4 ;byte: function to perform when calling BIOSF_CRDACCESS, see below table BIOS_CRDRESULT equ $10FDC6 ;byte: 00 on success, else 80+ and encodes the error, see below table 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, only on MVS (in BCD)

BIOS_YEAR equ $10FDD2 ;last 2 digits of year BIOS_MONTH equ $10FDD3 BIOS_DAY equ $10FDD4 BIOS_WEEKDAY equ $10FDD5 ;Sunday = 00, Monday = 01 ... Saturday = 06 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 to DRAM

BIOS_UPDEST equ $10FEF4 ;longword: destination address (!) BIOS_UPSRC equ $10FEF8 ;longword: source address BIOS_UPSIZE equ $10FEFC ;longword: size BIOS_UPZONE equ $10FEDA ;byte: zone (0=PRG, 1=FIX, 2=SPR, 3=Z80, 4=PCM, 5=PAT) BIOS_UPBANK equ $10FEDB ;byte: bank