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sonic.asm
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; +------------------------------------------------------+
; | Sonic the Hedgehog (Prototype) |
; | Split/Text Disassembly. |
; | Originally done by Mega Drive Developers Collective. |
; +------------------------------------------------------+
; Processor: Motorola 68000 (M68K)
; Sound Processor: Zilog Z80 (Z80)
; Intended for tab width of 8
; ---------------------------------------------------------------------------
cpu 68000
zeroOffsetOptimization = 0
; | If 1, makes a handful of zero-offset instructions smaller
include "MacroSetup.asm"
include "Constants.asm"
include "Variables.asm"
include "Macros.asm"
; ---------------------------------------------------------------------------
StartOfROM:
Vectors: dc.l v_systemstack&$FFFFFF ; Initial stack pointer value
dc.l EntryPoint ; Start of program
dc.l BusError ; Bus error
dc.l AddressError ; Address error (4)
dc.l IllegalInstr ; Illegal instruction
dc.l ZeroDivide ; Division by zero
dc.l ChkInstr ; CHK exception
dc.l TrapvInstr ; TRAPV exception (8)
dc.l PrivilegeViol ; Privilege violation
dc.l Trace ; TRACE exception
dc.l Line1010Emu ; Line-A emulator
dc.l Line1111Emu ; Line-F emulator (12)
dc.l ErrorExcept ; Unused (reserved)
dc.l ErrorExcept ; Unused (reserved)
dc.l ErrorExcept ; Unused (reserved)
dc.l ErrorExcept ; Unused (reserved) (16)
dc.l ErrorExcept ; Unused (reserved)
dc.l ErrorExcept ; Unused (reserved)
dc.l ErrorExcept ; Unused (reserved)
dc.l ErrorExcept ; Unused (reserved) (20)
dc.l ErrorExcept ; Unused (reserved)
dc.l ErrorExcept ; Unused (reserved)
dc.l ErrorExcept ; Unused (reserved)
dc.l ErrorExcept ; Unused (reserved) (24)
dc.l ErrorExcept ; Spurious exception
dc.l ErrorTrap ; IRQ level 1
dc.l ErrorTrap ; IRQ level 2
dc.l ErrorTrap ; IRQ level 3 (28)
dc.l HBlank ; IRQ level 4 (horizontal retrace interrupt)
dc.l ErrorTrap ; IRQ level 5
dc.l VBlank ; IRQ level 6 (vertical retrace interrupt)
dc.l ErrorTrap ; IRQ level 7 (32)
dc.l ErrorTrap ; TRAP #00 exception
dc.l ErrorTrap ; TRAP #01 exception
dc.l ErrorTrap ; TRAP #02 exception
dc.l ErrorTrap ; TRAP #03 exception (36)
dc.l ErrorTrap ; TRAP #04 exception
dc.l ErrorTrap ; TRAP #05 exception
dc.l ErrorTrap ; TRAP #06 exception
dc.l ErrorTrap ; TRAP #07 exception (40)
dc.l ErrorTrap ; TRAP #08 exception
dc.l ErrorTrap ; TRAP #09 exception
dc.l ErrorTrap ; TRAP #10 exception
dc.l ErrorTrap ; TRAP #11 exception (44)
dc.l ErrorTrap ; TRAP #12 exception
dc.l ErrorTrap ; TRAP #13 exception
dc.l ErrorTrap ; TRAP #14 exception
dc.l ErrorTrap ; TRAP #15 exception (48)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
dc.l ErrorTrap ; Unused (reserved)
Console: dc.b "SEGA MEGA DRIVE " ; Hardware system ID (Console name)
dc.b "(C)SEGA 1989.JAN" ; Copyright holder and release date (generally year)
Title_Local: dc.b " " ; Domestic name (blank)
Title_Int: dc.b " " ; International name (blank)
Serial: dc.b "GM 00000000-00" ; Serial\version number
Checksum: dc.w 0 ; Checksum
dc.b "J " ; I\O support
RomStartLoc: dc.l StartOfROM ; Start address of ROM
RomEndLoc: dc.l EndOfROM-1 ; End address of ROM
RamStartLoc: dc.l v_start&$FFFFFF ; Start address of RAM
RamEndLoc: dc.l (v_end-1)&$FFFFFF ; End address of RAM
SRAMSupport: dc.l $20202020 ; SRAM (none)
dc.l $20202020 ; SRAM start ($200001)
dc.l $20202020 ; SRAM end ($20xxxx)
Notes: dc.b " " ; Notes (unused, anything can be put in this space, but it has to be 52 bytes.)
dc.b "JU " ; Region (Country code)
EndOfHeader:
; ===========================================================================
; Crash/Freeze the 68000.
ErrorTrap:
nop
nop
bra.s ErrorTrap
; ===========================================================================
EntryPoint:
tst.l (z80_port_1_control).l
loc_20C:
bne.w loc_306
tst.w (z80_expansion_control).l
bne.s loc_20C
lea SetupValues(pc),a5
movem.l (a5)+,d5-a4
move.w -$1100(a1),d0
andi.w #$F00,d0
beq.s loc_232
move.l #"SEGA",$2F00(a1)
loc_232:
move.w (a4),d0
moveq #0,d0
movea.l d0,a6
move.l a6,usp
moveq #$18-1,d1
loc_23C:
move.b (a5)+,d5
move.w d5,(a4)
add.w d7,d5
dbf d1,loc_23C
move.l #$40000080,(a4)
move.w d0,(a3)
move.w d7,(a1)
move.w d7,(a2)
loc_252:
btst d0,(a1)
bne.s loc_252
moveq #$28-1,d2
loc_258:
move.b (a5)+,(a0)+
dbf d2,loc_258
move.w d0,(a2)
move.w d0,(a1)
move.w d7,(a2)
loc_264:
move.l d0,-(a6)
dbf d6,loc_264
move.l #$81048F02,(a4)
move.l #$C0000000,(a4)
moveq #bytesToLcnt(v_palette_end-v_palette),d3
loc_278:
move.l d0,(a3)
dbf d3,loc_278
move.l #$40000010,(a4)
moveq #bytesToLcnt($50),d4
loc_286:
move.l d0,(a3)
dbf d4,loc_286
moveq #4-1,d5
loc_28E:
move.b (a5)+,$10(a3)
dbf d5,loc_28E
move.w d0,(a2)
movem.l (a6),d0-a6
disable_ints
bra.s loc_306
; ---------------------------------------------------------------------------
SetupValues: dc.l $8000 ; VDP register start number
dc.l $3FFF ; size of RAM\4
dc.l $100 ; VDP register diff
dc.l z80_ram ; start of Z80 RAM
dc.l z80_bus_request ; Z80 bus request
dc.l z80_reset ; Z80 reset
dc.l vdp_data_port ; VDP data
dc.l vdp_control_port ; VDP control
; VDP register values, $8000-$9700 (for initialization)
dc.b 4
dc.b $14
dc.b $30
dc.b $3C
dc.b 7
dc.b $6C
dc.b 0
dc.b 0
dc.b 0
dc.b 0
dc.b $FF
dc.b 0
dc.b $81
dc.b $37
dc.b 0
dc.b 1
dc.b 1
dc.b 0
dc.b 0
dc.b $FF
dc.b $FF
dc.b 0
dc.b 0
dc.b $80
even
; Z80 initalization
save
cpu z80
xor a
ld bc,1FD7h
ld de,29h
ld hl,28h
ld sp,hl
ld (hl),a
ldir
pop ix
pop iy
ld i,a
ld r,a
ex af,af'
exx
pop af
pop bc
pop de
pop hl
ex af,af'
exx
pop af
pop de
pop hl
ld sp,hl
di
im 1
ld (hl),0E9h
jp (hl)
restore
padding off
dc.b $9F,$BF,$DF,$FF ; values for PSG channel volumes
even
; ---------------------------------------------------------------------------
loc_306:
btst #6,(z80_expansion_control+1).l
beq.s DoChecksum
cmpi.l #"init",(v_init).w
beq.w loc_36A
DoChecksum:
movea.l #EndOfHeader,a0
movea.l #RomEndLoc,a1
move.l (a1),d0
moveq #0,d1
loc_32C:
add.w (a0)+,d1
cmp.l a0,d0
bhs.s loc_32C
movea.l #Checksum,a1
cmp.w (a1),d1
nop
nop
lea (v_crossresetram).w,a6
moveq #0,d7
move.w #bytesToLcnt(v_end-v_crossresetram),d6
loc_348:
move.l d7,(a6)+
dbf d6,loc_348
move.b (z80_version).l,d0
andi.b #$C0,d0
move.b d0,(v_megadrive).w
move.w #1,(word_FFFFE0).w
move.l #"init",(v_init).w
loc_36A:
lea (v_start&$FFFFFF).l,a6
moveq #0,d7
move.w #bytesToLcnt(v_crossresetram-v_start),d6
loc_376:
move.l d7,(a6)+
dbf d6,loc_376
bsr.w VDPSetupGame
bsr.w SoundDriverLoad
bsr.w padInit
move.b #id_Sega,(v_gamemode).w
ScreensLoop:
move.b (v_gamemode).w,d0
andi.w #$1C,d0
jsr GameModeArray(pc,d0.w)
bra.s ScreensLoop
; ---------------------------------------------------------------------------
GameModeArray:
ptr_GM_Sega: bra.w GM_Sega
; ---------------------------------------------------------------------------
ptr_GM_Title: bra.w GM_Title
; ---------------------------------------------------------------------------
ptr_GM_Demo: bra.w GM_Level
; ---------------------------------------------------------------------------
ptr_GM_Level: bra.w GM_Level
; ---------------------------------------------------------------------------
ptr_GM_Special: bra.w GM_Special
; ---------------------------------------------------------------------------
rts
; ---------------------------------------------------------------------------
; Unused, as the checksum check doesn't care if the checksum is wrong.
ChecksumError:
bsr.w VDPSetupGame
move.l #$C0000000,(vdp_control_port).l ; Set VDP to CRAM write
moveq #bytesToWcnt(v_palette_end-v_palette),d7
.palette:
move.w #cRed,(vdp_data_port).l ; Write red to data
dbf d7,.palette
bra.s *
; ---------------------------------------------------------------------------
BusError:
move.b #2,(v_errortype).w
bra.s ErrorAddress
; ---------------------------------------------------------------------------
AddressError:
move.b #4,(v_errortype).w
bra.s ErrorAddress
; ---------------------------------------------------------------------------
IllegalInstr:
move.b #6,(v_errortype).w
addq.l #2,2(sp)
bra.s ErrorNormal
; ---------------------------------------------------------------------------
ZeroDivide:
move.b #8,(v_errortype).w
bra.s ErrorNormal
; ---------------------------------------------------------------------------
ChkInstr:
move.b #$A,(v_errortype).w
bra.s ErrorNormal
; ---------------------------------------------------------------------------
TrapvInstr:
move.b #$C,(v_errortype).w
bra.s ErrorNormal
; ---------------------------------------------------------------------------
PrivilegeViol:
move.b #$E,(v_errortype).w
bra.s ErrorNormal
; ---------------------------------------------------------------------------
Trace:
move.b #$10,(v_errortype).w
bra.s ErrorNormal
; ---------------------------------------------------------------------------
Line1010Emu:
move.b #$12,(v_errortype).w
addq.l #2,2(sp)
bra.s ErrorNormal
; ---------------------------------------------------------------------------
Line1111Emu:
move.b #$14,(v_errortype).w
addq.l #2,2(sp)
bra.s ErrorNormal
; ---------------------------------------------------------------------------
ErrorExcept:
move.b #0,(v_errortype).w
bra.s ErrorNormal
; ---------------------------------------------------------------------------
ErrorAddress:
disable_ints
addq.w #2,sp
move.l (sp)+,(v_spbuffer).w
addq.w #2,sp
movem.l d0-sp,(v_regbuffer).w
bsr.w ErrorPrint
move.l 2(sp),d0
bsr.w ErrorPrintAddr
move.l (v_spbuffer).w,d0
bsr.w ErrorPrintAddr
bra.s loc_472
; ---------------------------------------------------------------------------
ErrorNormal:
disable_ints
movem.l d0-sp,(v_regbuffer).w
bsr.w ErrorPrint
move.l 2(sp),d0
bsr.w ErrorPrintAddr
loc_472:
bsr.w ErrorWaitInput
movem.l (v_regbuffer).w,d0-sp
enable_ints
rte
; ---------------------------------------------------------------------------
ErrorPrint:
lea (vdp_data_port).l,a6
locVRAM $F800
lea (Art_Text).l,a0
move.w #bytesToWcnt(Art_Text_end-Art_Text-tile_size),d1
.loadart:
move.w (a0)+,(a6)
dbf d1,.loadart
moveq #0,d0
move.b (v_errortype).w,d0
move.w Error_Text(pc,d0.w),d0
lea Error_Text(pc,d0.w),a0
locVRAM (vram_fg+$604)
moveq #$13-1,d1
.loadtext:
moveq #0,d0
move.b (a0)+,d0
addi.w #$790,d0
move.w d0,(a6)
dbf d1,.loadtext
rts
; ---------------------------------------------------------------------------
Error_Text: dc.w .exception-Error_Text
dc.w .bus-Error_Text
dc.w .address-Error_Text
dc.w .illinstruct-Error_Text
dc.w .zerodivide-Error_Text
dc.w .chkinstruct-Error_Text
dc.w .trapv-Error_Text
dc.w .privilege-Error_Text
dc.w .trace-Error_Text
dc.w .line1010-Error_Text
dc.w .line1111-Error_Text
.exception: dc.b "ERROR EXCEPTION "
.bus: dc.b "BUS ERROR "
.address: dc.b "ADDRESS ERROR "
.illinstruct: dc.b "ILLEGAL INSTRUCTION"
.zerodivide: dc.b "@ERO DIVIDE "
.chkinstruct: dc.b "CHK INSTRUCTION "
.trapv: dc.b "TRAPV INSTRUCTION "
.privilege: dc.b "PRIVILEGE VIOLATION"
.trace: dc.b "TRACE "
.line1010: dc.b "LINE 1010 EMULATOR "
.line1111: dc.b "LINE 1111 EMULATOR "
even
; ---------------------------------------------------------------------------
ErrorPrintAddr:
move.w #$7CA,(a6)
moveq #8-1,d2
loc_5BA:
rol.l #4,d0
bsr.s sub_5C4
dbf d2,loc_5BA
rts
; ---------------------------------------------------------------------------
sub_5C4:
move.w d0,d1
andi.w #$F,d1
cmpi.w #$A,d1
bcs.s loc_5D2
addq.w #7,d1
loc_5D2:
addi.w #$7C0,d1
move.w d1,(a6)
rts
; ---------------------------------------------------------------------------
ErrorWaitInput:
bsr.w ReadJoypads
cmpi.b #btnC,(v_jpadpress1).w
bne.w ErrorWaitInput
rts
; ---------------------------------------------------------------------------
Art_Text: binclude "artunc/menutext.bin"
Art_Text_end: even
; ---------------------------------------------------------------------------
VBlank:
movem.l d0-a6,-(sp)
tst.b (v_vbla_routine).w
beq.s VBla_Exit
move.w (vdp_control_port).l,d0
move.l #$40000010,(vdp_control_port).l
move.l (v_scrposy_dup).w,(vdp_data_port).l
btst #6,(v_megadrive).w ; are we on a PAL machine?
beq.s .notPAL ; if not, branch
move.w #$700,d0 ; intentionally lag the system to move the CRAM dots
dbf d0,*
.notPAL:
move.b (v_vbla_routine).w,d0
move.b #0,(v_vbla_routine).w
move.w #1,(f_hblank).w
andi.w #$3E,d0
move.w VBla_Index(pc,d0.w),d0
jsr VBla_Index(pc,d0.w)
VBla_Exit:
addq.l #1,(v_vbla_count).w
jsr (UpdateMusic).l
movem.l (sp)+,d0-a6
rte
; ---------------------------------------------------------------------------
VBla_00:
rts
; ---------------------------------------------------------------------------
VBla_Index: dc.w VBla_00-VBla_Index
dc.w VBla_02-VBla_Index
dc.w VBla_04-VBla_Index
dc.w VBla_06-VBla_Index
dc.w VBla_08-VBla_Index
dc.w VBla_0A-VBla_Index
dc.w VBla_0C-VBla_Index
dc.w VBla_0E-VBla_Index
dc.w VBla_10-VBla_Index
dc.w VBla_12-VBla_Index
; ---------------------------------------------------------------------------
VBla_02:
bsr.w sub_E78
tst.w (v_demolength).w
beq.w .end
subq.w #1,(v_demolength).w
.end:
rts
; ---------------------------------------------------------------------------
VBla_04:
bsr.w sub_E78
bsr.w LoadTilesAsYouMove_BGOnly
bsr.w sub_1438
tst.w (v_demolength).w
beq.w .end
subq.w #1,(v_demolength).w
.end:
rts
; ---------------------------------------------------------------------------
VBla_06:
bsr.w sub_E78
rts
; ---------------------------------------------------------------------------
VBla_10:
cmpi.b #id_Special,(v_gamemode).w
beq.w VBla_0A
VBla_08:
bsr.w ReadJoypads
stopZ80
waitZ80
writeCRAM v_palette,0
writeVRAM v_hscrolltablebuffer,vram_hscroll
move.w #$8407,(a5)
move.w (v_hbla_hreg).w,(a5)
move.w (v_bg3scrposy_vdp).w,(v_bg3scrposy_vdp_dup).w
writeVRAM v_spritetablebuffer,vram_sprites
tst.b (f_sonframechg).w
beq.s .nochg
writeVRAM v_sgfx_buffer,vram_sonic ; load new Sonic gfx
move.b #0,(f_sonframechg).w
.nochg:
startZ80
bsr.w LoadTilesAsYouMove
jsr (AnimateLevelGfx).l
jsr (UpdateHUD).l
bsr.w loc_1454
moveq #0,d0
move.b (byte_FFF628).w,d0
move.b (byte_FFF629).w,d1
cmp.b d0,d1
bhs.s loc_CA8
move.b d0,(byte_FFF629).w
loc_CA8:
move.b #0,(byte_FFF628).w
tst.w (v_demolength).w
beq.w .end
subq.w #1,(v_demolength).w
.end:
rts
; ---------------------------------------------------------------------------
VBla_0A:
bsr.w ReadJoypads
stopZ80
waitZ80
writeCRAM v_palette,0
writeVRAM v_spritetablebuffer,vram_sprites
writeVRAM v_hscrolltablebuffer,vram_hscroll
startZ80
bsr.w SS_PalCycle
tst.b (f_sonframechg).w
beq.s .nochg
writeVRAM v_sgfx_buffer,vram_sonic ; load new Sonic gfx
move.b #0,(f_sonframechg).w
.nochg:
tst.w (v_demolength).w
beq.w .end
subq.w #1,(v_demolength).w
.end:
rts
; ---------------------------------------------------------------------------
VBla_0C:
bsr.w ReadJoypads
stopZ80
waitZ80
writeCRAM v_palette,0
writeVRAM v_spritetablebuffer,vram_sprites
writeVRAM v_hscrolltablebuffer,vram_hscroll
tst.b (f_sonframechg).w
beq.s .nochg
writeVRAM v_sgfx_buffer,vram_sonic ; load new Sonic gfx
move.b #0,(f_sonframechg).w
.nochg:
startZ80
bsr.w LoadTilesAsYouMove
jsr (AnimateLevelGfx).l
jsr (UpdateHUD).l
bsr.w sub_1438
rts
; ---------------------------------------------------------------------------
VBla_0E:
bsr.w sub_E78
bsr.w ExecuteObjects
bsr.w BuildSprites
addq.b #1,(byte_FFF628).w
move.b #$E,(v_vbla_routine).w
rts
; ---------------------------------------------------------------------------
VBla_12:
bsr.w sub_E78
bra.w sub_1438
; ---------------------------------------------------------------------------
sub_E78:
bsr.w ReadJoypads
stopZ80
waitZ80
writeCRAM v_palette,0
writeVRAM v_spritetablebuffer,vram_sprites
writeVRAM v_hscrolltablebuffer,vram_hscroll
startZ80
rts
; ---------------------------------------------------------------------------
HBlank:
tst.w (f_hblank).w
beq.s .locret
move.l a5,-(sp)
writeCRAM v_palette_fading,0
movem.l (sp)+,a5
move.w #0,(f_hblank).w
.locret:
rte
; ---------------------------------------------------------------------------
HBlank2:
tst.w (f_hblank).w
beq.s .locret
movem.l d0/a0/a5,-(sp)
move.w #0,(f_hblank).w
move.w #$8405,(vdp_control_port).l
move.w #$857C,(vdp_control_port).l
locVRAM $F800
lea (v_spritetablebuffer).w,a0
lea (vdp_data_port).l,a5
move.w #bytesToLcnt(v_spritetablebuffer_end-v_spritetablebuffer),d0
.loop:
move.l (a0)+,(a5)
dbf d0,.loop
movem.l (sp)+,d0/a0/a5
.locret:
rte
; ---------------------------------------------------------------------------
padInit:
stopZ80
waitZ80
moveq #$40,d0
move.b d0,($A10009).l
move.b d0,($A1000B).l
move.b d0,($A1000D).l
startZ80
rts
; ---------------------------------------------------------------------------
ReadJoypads:
stopZ80
waitZ80
lea (v_jpadhold1).w,a0
lea (z80_port_1_data+1).l,a1
bsr.s Joypad_Read
addq.w #2,a1
bsr.s Joypad_Read
startZ80
rts
; ---------------------------------------------------------------------------
Joypad_Read:
move.b #0,(a1)
nop
nop
move.b (a1),d0
lsl.b #2,d0
andi.b #$C0,d0
move.b #$40,(a1)
nop
nop
move.b (a1),d1
andi.b #$3F,d1
or.b d1,d0
not.b d0
move.b (a0),d1
eor.b d0,d1
move.b d0,(a0)+
and.b d0,d1
move.b d1,(a0)+
rts
; ---------------------------------------------------------------------------
VDPSetupGame:
lea (vdp_control_port).l,a0
lea (vdp_data_port).l,a1
lea (VDPSetupArray).l,a2
moveq #bytesToWcnt(VDPSetupArray_End-VDPSetupArray),d7
loc_101E:
move.w (a2)+,(a0)
dbf d7,loc_101E
move.w (VDPSetupArray+2).l,d0
move.w d0,(v_vdp_buffer1).w
moveq #0,d0
move.l #$C0000000,(vdp_control_port).l
move.w #bytesToWcnt(v_palette_end-v_palette),d7
loc_103E:
move.w d0,(a1)
dbf d7,loc_103E
clr.l (v_scrposy_dup).w
clr.l (v_scrposx_dup).w
move.l d1,-(sp)
fillVRAM 0,0,$10000
move.l (sp)+,d1
rts
; ---------------------------------------------------------------------------
VDPSetupArray: dc.w $8004
dc.w $8134
dc.w $8230
dc.w $8328
dc.w $8407
dc.w $857C
dc.w $8600
dc.w $8700
dc.w $8800
dc.w $8900
dc.w $8A00
dc.w $8B00
dc.w $8C81
dc.w $8D3F
dc.w $8E00
dc.w $8F02
dc.w $9001
dc.w $9100
dc.w $9200
VDPSetupArray_End:
even
; ---------------------------------------------------------------------------
ClearScreen:
fillVRAM 0, vram_fg, vram_fg+plane_size_64x32 ; clear foreground namespace
fillVRAM 0, vram_bg, vram_bg+plane_size_64x32 ; clear background namespace
move.l #0,(v_scrposy_dup).w
move.l #0,(v_scrposx_dup).w
clearRAM v_spritetablebuffer,v_spritetablebuffer_end+4 ; This clears too much RAM, but this won't effect much since water palettes don't exist.
clearRAM v_hscrolltablebuffer,v_hscrolltablebuffer_end_padded+4 ; This clears too much RAM, leading to a slight bug (first bit of the Sonic object's RAM is cleared)
rts
; ---------------------------------------------------------------------------
SoundDriverLoad:
nop
stopZ80
resetZ80
lea (Unc_Z80).l,a0
lea (z80_ram).l,a1
move.w #(Unc_Z80_End-Unc_Z80)-1,d0
.loop:
move.b (a0)+,(a1)+
dbf d0,.loop
moveq #0,d0
lea (z80_dac_unk1FF8).l,a1
move.b d0,(a1)+ ; Write 0 to 1FF8
move.b #$80,(a1)+ ; Write $80 to 1FF9
move.b #7,(a1)+ ; Write 7 to 1FFA
move.b #$80,(a1)+ ; Write $80 to 1FFB
move.b d0,(a1)+ ; Write 0 to 1FFC
move.b d0,(a1)+ ; Write 0 to 1FFD
move.b d0,(a1)+ ; Write 0 to 1FFE
move.b d0,(a1)+ ; Write 0 to 1FFF
resetZ80a
nop
nop
nop
nop
resetZ80
startZ80
rts
; ---------------------------------------------------------------------------
; This could potentially be leftover Z80 variables for the above, unused
; ---------------------------------------------------------------------------
;unk_119C:
dc.b 3
dc.b 0
dc.b 0
dc.b $14
dc.b 0
dc.b 0
dc.b 0
dc.b 0
even
; ---------------------------------------------------------------------------
PlaySound:
move.b d0,(v_snddriver_ram.v_soundqueue0).w
rts
; ---------------------------------------------------------------------------
PlaySound_Special:
move.b d0,(v_snddriver_ram.v_soundqueue1).w
rts
; ---------------------------------------------------------------------------
PlaySound_Unused:
move.b d0,(v_snddriver_ram.v_soundqueue2).w
rts
include "_inc/PauseGame.asm"
; ---------------------------------------------------------------------------
TilemapToVRAM:
lea (vdp_data_port).l,a6
move.l #$800000,d4
loc_1222:
move.l d0,4(a6)
move.w d1,d3
loc_1228:
move.w (a1)+,(a6)
dbf d3,loc_1228
add.l d4,d0
dbf d2,loc_1222
rts
; ---------------------------------------------------------------------------
include "_inc/Nemesis Decompression.asm"
; ---------------------------------------------------------------------------
AddPLC:
movem.l a1-a2,-(sp)
lea (ArtLoadCues).l,a1
add.w d0,d0
move.w (a1,d0.w),d0
lea (a1,d0.w),a1
lea (v_plc_buffer).w,a2
loc_138E:
tst.l (a2)
beq.s loc_1396
addq.w #6,a2
bra.s loc_138E
; ---------------------------------------------------------------------------
loc_1396:
move.w (a1)+,d0
bmi.s loc_13A2
loc_139A:
move.l (a1)+,(a2)+
move.w (a1)+,(a2)+
dbf d0,loc_139A
loc_13A2:
movem.l (sp)+,a1-a2
rts
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
; Queue pattern load requests, but clear the PLQ first
; ARGUMENTS
; d0 = index of PLC list (see ArtLoadCues)
; NOTICE: This subroutine does not check for buffer overruns. The programmer
; (or hacker) is responsible for making sure that no more than
; 16 load requests are copied into the buffer.
; _________DO NOT PUT MORE THAN 16 LOAD REQUESTS IN A LIST!__________
; (or if you change the size of Plc_Buffer, the limit becomes (Plc_Buffer_Only_End-Plc_Buffer)/6)
; LoadPLC2:
NewPLC:
movem.l a1-a2,-(sp)
lea (ArtLoadCues).l,a1
add.w d0,d0
move.w (a1,d0.w),d0
lea (a1,d0.w),a1 ; jump to relevant PLC
bsr.s ClearPLC ; erase any data in PLC buffer space
lea (v_plc_buffer).w,a2
move.w (a1)+,d0 ; get length of PLC
bmi.s .skip ; if it's negative, skip the next loop
.loop:
move.l (a1)+,(a2)+
move.w (a1)+,(a2)+ ; copy PLC to RAM
dbf d0,.loop ; repeat for length of PLC
.skip:
movem.l (sp)+,a1-a2
rts
; End of function NewPLC
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
; ---------------------------------------------------------------------------
; Subroutine to clear the pattern load cues
; ---------------------------------------------------------------------------
; Clear the pattern load queue ($FFF680 - $FFF700)
ClearPLC:
lea (v_plc_buffer).w,a2 ; PLC buffer space in RAM
moveq #bytesToLcnt(v_plc_buffer_end-v_plc_buffer),d0
.loop:
clr.l (a2)+
dbf d0,.loop
rts
; End of function ClearPLC
; ---------------------------------------------------------------------------
RunPLC:
tst.l (v_plc_buffer).w
beq.s locret_1436
tst.w (f_plc_execute).w
bne.s locret_1436
movea.l (v_plc_buffer).w,a0
lea (NemPCD_WriteRowToVDP).l,a3
lea (v_ngfx_buffer).w,a1
move.w (a0)+,d2
bpl.s loc_1404
adda.w #NemPCD_WriteRowToVDP_XOR-NemPCD_WriteRowToVDP,a3
loc_1404: