68k ASM defines

Here are preliminary ASM defines for memory locations and constants. For detailed descriptions, see Memory mapped registers.

This can be made into a file and included in your ASM source code to use register names instead of their (meaningless) addresses in RAM.

SCB1            equ $0000   ;VRAM, Sprite tilemaps
FIXMAP          equ $7000   ;VRAM, Fix map
SCB2            equ $8000   ;VRAM, Sprite shrink
SCB3            equ $8200   ;VRAM, Sprite Y positions and sizes
SCB4            equ $8400   ;VRAM, Sprite X positions

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

RAMSTART        equ $100000 ;User RAM start
PALETTES        equ $400000 ;Palette RAM start

REG_P1CNT       equ $300000 ;Joystick port 1
REG_DIPSW       equ $300001 ;Dipswitches/Watchdog
REG_SOUND       equ $320000 ;In/Out Z80
REG_STATUS_A    equ $320001
REG_P2CNT       equ $340000 ;Joystick port 2
REG_STATUS_B    equ $380000
REG_POUTPUT     equ $380001 ;Joypad port outputs 	 
REG_SLOT        equ $380021 ;Slot selection

REG_DISPENABL   equ $3A0001 ;Video output ON
REG_DISPDSABL   equ $3A0011 ;Video output OFF
REG_SWPROM      equ $3A0013 ;Use ROM vector table
REG_CRDUNLOCK1  equ $3A0005 ;Allow /WE to pass through to memory card when low
REG_CRDLOCK1    equ $3A0015 ;Don't allow /WE to pass through to memory card
REG_CRDLOCK2    equ $3A0007 ;Don't allow /WE to pass through to memory card
REG_CRDUNLOCK2  equ $3A0017 ;Allow /WE to pass through to memory card when high
REG_BRDFIX      equ $3A000B ;Use board fix tileset
REG_CRTFIX      equ $3A001B ;Use ROM fix tileset
REG_SRAMLOCK    equ $3A000D ;Write-protect SRAM
REG_SRAMUNLOCK  equ $3A001D ;Write-unprotect SRAM
REG_PALBANK1    equ $3A000F ;Use palette bank 1
REG_PALBANK0    equ $3A001F ;Use palette bank 0 (default)

VRAM_ADDR       equ $3C0000
VRAM_RW         equ $3C0002
VRAM_MOD        equ $3C0004
REG_HBLANKCNT   equ $3C0006
REG_HBLANKPOS   equ $3C0008
REG_IRQACK      equ $3C000C

; BIOS calls
BIOSF_BOOTSCR   equ $C00438 ;Show boot screen (and other things)
BIOSF_VBL       equ $C0044A ;Multiple purposes
BIOSF_GETTIME   equ $C0045C ;Set calendar addresses (10FDD2+), MVS only
BIOSF_CRDACCESS equ $C00468 ;Access memory card with specified function (check CRDF)
BIOSF_CRDREPORT equ $C0046E ;In case an error occurred ("CARD FULL" etc.), prompt user for action
BIOSF_VIDEOEN   equ $C00470 ;Enable/disable video layers, CD only
BIOSF_HOWTOPLAY equ $C00474 ;Show how-to-play presentation, MVS only
BIOSF_CLEARFIX  equ $C004C2 ;Clear fix layer
BIOSF_CLEARSPR  equ $C004C8 ;Clear sprites
BIOSF_UPLOAD    equ $C00546 ;Upload data to DRAM   
BIOSF_CDDACMD   equ $C0056A ;Issue CDDA command

;DMA related:
REG_DMACPYSRC   equ $FF0064 ;longword: Copy source address ?
REG_DMAFILDEST  equ $FF0064 ;longword: Fill destination address ?
REG_DMACPYDEST  equ $FF0068 ;longword: Copy destination address ?
REG_DMAFILVAL   equ $FF006C ;word: Fill value (word) ?
REG_DMASIZE     equ $FF0070 ;longword?: Size (in 16 bit words)
REG_DMASTART    equ $FF0060 ;byte: Start transfer ($40 ?)

REG_DISBLSPR    equ $FF0111 ;byte: 0/1 disable sprites
REG_DISBLFIX    equ $FF0115 ;byte: 0/1 disable fix layer
REG_ENVIDEO     equ $FF0119 ;byte: 0/1 enable video output
REG_CDCONFIG    equ $FF011C ;word: jumper and lid switch input

REG_UPMAPSPR    equ $FF0121 ;bytes (0 or 1)
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

BIOS_SYSSTAT    equ $10FD80 ;Word: ?

BIOS_SOFTDIPS   equ $10FD84 ;start of soft DIPs settings (up to $10FD93)

; Set by BIOSF_VBL
BIOS_P1CURRENT  equ $10FD95 ;joystick 1 state
BIOS_P1PREVIOUS equ $10FD96 ;previous joystick 1 state
BIOS_P1CHANGE   equ $10FD97 ;joystick 1 state change
BIOS_P1REPEAT   equ $10FD98 ;joystick 1 repeat
BIOS_P2CURRENT  equ $10FD9B ;joystick 2 state
BIOS_P2PREVIOUS equ $10FD9C ;previous joystick 2 state
BIOS_P2CHANGE   equ $10FD9D ;joystick 2 state change
BIOS_P2REPEAT   equ $10FD9E ;joystick 2 repeat
BIOS_STATCURNT  equ $10FDAC ;joystick 1/2 start/select
BIOS_STATCHANGE equ $10FDAD ;previous joystick 1/2 start/select

; 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 set by MVS (all data stored 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_DEVMODE    equ $10FE80 ;Byte: $FF 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