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

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_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_CRDUNLOCK1 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 bootscreen (and other things) 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_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

BIOS_SYSSTAT   equ $10FD80         ; Word: ?

; Set by BIOSF_? (read player controls) 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_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		;8bit: function to perform when calling BIOSF_CRDACCESS, see below table BIOS_CRDRESULT equ $10FDC6		;8bit: 00 on success, else 80+ and encodes the error, see below table BIOS_CRDPTR    equ $10FDC8         ;32bit: pointer to read from/write to    BIOS_CRDSIZE    equ $10FDCC         ;16bit: how much data to read/write from/to card BIOS_CRDNGH    equ $10FDCE		;16bit: usually game NGH. Unique identifier for the game that 'owns' the save file BIOS_CRDFILE   equ $10FDD0         ;16bit: each NGH has up to 16 save 'files' associated with