785 lines
14 KiB
NASM
785 lines
14 KiB
NASM
; Sameboy CGB bootstrap ROM
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; Todo: use friendly names for HW registers instead of magic numbers
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; Todo: add support for games that assume DMG boot logo (Such as X), like the
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; original boot ROM.
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SECTION "BootCode", ROM0[$0]
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Start:
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; Init stack pointer
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ld sp, $fffe
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; Select RAM bank
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ld a, 2
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ldh [$70], a
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xor a
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; Clear memory VRAM
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ld hl, $8000
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call ClearMemoryPage
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ld h, $d0
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call ClearMemoryPage
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; Clear OAM
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ld hl, $fe00
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ld c, $a0
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xor a
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.clearOAMLoop
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ldi [hl], a
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dec c
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jr nz, .clearOAMLoop
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; Init Audio
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ld a, $80
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ldh [$26], a
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ldh [$11], a
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ld a, $f3
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ldh [$12], a
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ldh [$25], a
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ld a, $77
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ldh [$24], a
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ld hl, $FF30
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; Init waveform
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xor a
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ld c, $10
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.waveformLoop
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ldi [hl], a
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cpl
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dec c
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jr nz, .waveformLoop
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; Init BG palette
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ld a, $fc
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ldh [$47], a
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; Load logo from ROM.
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; A nibble represents a 4-pixels line, 2 bytes represent a 4x4 tile, scaled to 8x8.
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; Tiles are ordered left to right, top to bottom.
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; These tiles are not used, but are required for DMG compatibility. This is done
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; by the original CGB Boot ROM as well.
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ld de, $104 ; Logo start
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ld hl, $8010 ; This is where we load the tiles in VRAM
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.loadLogoLoop
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ld a, [de] ; Read 2 rows
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ld b, a
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call DoubleBitsAndWriteRow
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call DoubleBitsAndWriteRow
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inc de
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ld a, e
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xor $34 ; End of logo
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jr nz, .loadLogoLoop
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call ReadTrademarkSymbol
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; Clear the second VRAM bank
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ld a, 1
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ldh [$4F], a
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xor a
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ld hl, $8000
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call ClearMemoryPage
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; Copy (unresized) ROM logo
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ld de, $104
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ld c, 6
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.CGBROMLogoLoop
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push bc
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call ReadCGBLogoTile
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pop bc
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dec c
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jr nz, .CGBROMLogoLoop
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inc hl
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call ReadTrademarkSymbol
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; Load Tilemap
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ld hl, $98C2
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ld b, 3
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ld a, 8
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.tilemapLoop
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ld c, $10
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.tilemapRowLoop
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ld [hl], a
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push af
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; Switch to second VRAM Bank
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ld a, 1
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ldh [$4F], a
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ld a, 8
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ld [hl], a
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; Switch to back first VRAM Bank
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xor a
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ldh [$4F], a
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pop af
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ldi [hl], a
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inc a
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dec c
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jr nz, .tilemapRowLoop
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ld de, $10
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add hl, de
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dec b
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jr nz, .tilemapLoop
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cp $38
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jr nz, .doneTilemap
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ld hl, $99a7
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ld b, 1
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ld c, 7
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jr .tilemapRowLoop
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.doneTilemap
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; Clear Palettes
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ld c, 64
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ld hl, BgPalettes
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ld a, $FF
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.clearPalettesLoop:
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ldi [hl], a
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dec c
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jr nz, .clearPalettesLoop
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ld hl, BgPalettes
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ld d, 64 ; Length of write
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ld e, 0 ; Index of write
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call LoadBGPalettes
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; Turn on LCD
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ld a, $91
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ldh [$40], a
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call Preboot
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; Will be filled with NOPs
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SECTION "BootGame", ROM0[$fe]
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BootGame:
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ldh [$50], a
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SECTION "MoreStuff", ROM0[$200]
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; Game Palettes Data
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TitleChecksums:
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db $00 ; Default
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db $88 ; ALLEY WAY
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db $16 ; YAKUMAN
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db $36 ; BASEBALL, (Game and Watch 2)
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db $D1 ; TENNIS
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db $DB ; TETRIS
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db $F2 ; QIX
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db $3C ; DR.MARIO
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db $8C ; RADARMISSION
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db $92 ; F1RACE
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db $3D ; YOSSY NO TAMAGO
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db $5C ;
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db $58 ; X
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db $C9 ; MARIOLAND2
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db $3E ; YOSSY NO COOKIE
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db $70 ; ZELDA
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db $1D ;
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db $59 ;
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db $69 ; TETRIS FLASH
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db $19 ; DONKEY KONG
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db $35 ; MARIO'S PICROSS
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db $A8 ;
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db $14 ; POKEMON RED, (GAMEBOYCAMERA G)
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db $AA ; POKEMON GREEN
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db $75 ; PICROSS 2
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db $95 ; YOSSY NO PANEPON
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db $99 ; KIRAKIRA KIDS
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db $34 ; GAMEBOY GALLERY
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db $6F ; POCKETCAMERA
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db $15 ;
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db $FF ; BALLOON KID
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db $97 ; KINGOFTHEZOO
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db $4B ; DMG FOOTBALL
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db $90 ; WORLD CUP
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db $17 ; OTHELLO
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db $10 ; SUPER RC PRO-AM
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db $39 ; DYNABLASTER
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db $F7 ; BOY AND BLOB GB2
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db $F6 ; MEGAMAN
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db $A2 ; STAR WARS-NOA
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db $49 ;
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db $4E ; WAVERACE
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db $43 | $80 ;
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db $68 ; LOLO2
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db $E0 ; YOSHI'S COOKIE
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db $8B ; MYSTIC QUEST
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db $F0 ;
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db $CE ; TOPRANKINGTENNIS
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db $0C ; MANSELL
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db $29 ; MEGAMAN3
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db $E8 ; SPACE INVADERS
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db $B7 ; GAME&WATCH
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db $86 ; DONKEYKONGLAND95
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db $9A ; ASTEROIDS/MISCMD
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db $52 ; STREET FIGHTER 2
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db $01 ; DEFENDER/JOUST
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db $9D ; KILLERINSTINCT95
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db $71 ; TETRIS BLAST
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db $9C ; PINOCCHIO
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db $BD ;
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db $5D ; BA.TOSHINDEN
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db $6D ; NETTOU KOF 95
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db $67 ;
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db $3F ; TETRIS PLUS
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db $6B ; DONKEYKONGLAND 3
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; For these games, the 4th letter is taken into account
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FirstChecksumWithDuplicate:
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; Let's play hangman!
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db $B3 ; ???[B]????????
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db $46 ; SUP[E]R MARIOLAND
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db $28 ; GOL[F]
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db $A5 ; SOL[A]RSTRIKER
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db $C6 ; GBW[A]RS
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db $D3 ; KAE[R]UNOTAMENI
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db $27 ; ???[B]????????
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db $61 ; POK[E]MON BLUE
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db $18 ; DON[K]EYKONGLAND
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db $66 ; GAM[E]BOY GALLERY2
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db $6A ; DON[K]EYKONGLAND 2
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db $BF ; KID[ ]ICARUS
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db $0D ; TET[R]IS2
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db $F4 ; ???[-]????????
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db $B3 ; MOG[U]RANYA
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db $46 ; ???[R]????????
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db $28 ; GAL[A]GA&GALAXIAN
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db $A5 ; BT2[R]AGNAROKWORLD
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db $C6 ; KEN[ ]GRIFFEY JR
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db $D3 ; ???[I]????????
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db $27 ; MAG[N]ETIC SOCCER
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db $61 ; VEG[A]S STAKES
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db $18 ; ???[I]????????
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db $66 ; MIL[L]I/CENTI/PEDE
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db $6A ; MAR[I]O & YOSHI
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db $BF ; SOC[C]ER
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db $0D ; POK[E]BOM
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db $F4 ; G&W[ ]GALLERY
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db $B3 ; TET[R]IS ATTACK
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ChecksumsEnd:
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PalettePerChecksum:
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; | $80 means game requires DMG boot tilemap
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db 0 ; Default Palette
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db 4 ; ALLEY WAY
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db 5 ; YAKUMAN
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db 35 ; BASEBALL, (Game and Watch 2)
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db 34 ; TENNIS
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db 3 ; TETRIS
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db 31 ; QIX
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db 15 ; DR.MARIO
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db 10 ; RADARMISSION
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db 5 ; F1RACE
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db 19 ; YOSSY NO TAMAGO
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db 36 ;
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db 7 | $80 ; X
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db 37 ; MARIOLAND2
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db 30 ; YOSSY NO COOKIE
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db 44 ; ZELDA
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db 21 ;
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db 32 ;
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db 31 ; TETRIS FLASH
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db 20 ; DONKEY KONG
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db 5 ; MARIO'S PICROSS
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db 33 ;
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db 13 ; POKEMON RED, (GAMEBOYCAMERA G)
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db 14 ; POKEMON GREEN
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db 5 ; PICROSS 2
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db 29 ; YOSSY NO PANEPON
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db 5 ; KIRAKIRA KIDS
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db 18 ; GAMEBOY GALLERY
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db 9 ; POCKETCAMERA
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db 3 ;
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db 2 ; BALLOON KID
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db 26 ; KINGOFTHEZOO
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db 25 ; DMG FOOTBALL
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db 25 ; WORLD CUP
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db 41 ; OTHELLO
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db 42 ; SUPER RC PRO-AM
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db 26 ; DYNABLASTER
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db 45 ; BOY AND BLOB GB2
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db 42 ; MEGAMAN
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db 45 ; STAR WARS-NOA
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db 36 ;
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db 38 ; WAVERACE
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db 26 ;
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db 42 ; LOLO2
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db 30 ; YOSHI'S COOKIE
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db 41 ; MYSTIC QUEST
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db 34 ;
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db 34 ; TOPRANKINGTENNIS
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db 5 ; MANSELL
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db 42 ; MEGAMAN3
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db 6 ; SPACE INVADERS
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db 5 ; GAME&WATCH
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db 33 ; DONKEYKONGLAND95
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db 25 ; ASTEROIDS/MISCMD
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db 42 ; STREET FIGHTER 2
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db 42 ; DEFENDER/JOUST
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db 40 ; KILLERINSTINCT95
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db 2 ; TETRIS BLAST
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db 16 ; PINOCCHIO
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db 25 ;
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db 42 ; BA.TOSHINDEN
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db 42 ; NETTOU KOF 95
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db 5 ;
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db 0 ; TETRIS PLUS
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db 39 ; DONKEYKONGLAND 3
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db 36 ;
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db 22 ; SUPER MARIOLAND
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db 25 ; GOLF
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db 6 ; SOLARSTRIKER
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db 32 ; GBWARS
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db 12 ; KAERUNOTAMENI
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db 36 ;
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db 11 ; POKEMON BLUE
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db 39 ; DONKEYKONGLAND
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db 18 ; GAMEBOY GALLERY2
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db 39 ; DONKEYKONGLAND 2
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db 24 ; KID ICARUS
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db 31 ; TETRIS2
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db 50 ;
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db 17 ; MOGURANYA
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db 46 ;
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db 6 ; GALAGA&GALAXIAN
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db 27 ; BT2RAGNAROKWORLD
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db 0 ; KEN GRIFFEY JR
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db 47 ;
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db 41 ; MAGNETIC SOCCER
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db 41 ; VEGAS STAKES
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db 0 ;
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db 0 ; MILLI/CENTI/PEDE
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db 19 ; MARIO & YOSHI
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db 34 ; SOCCER
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db 23 ; POKEBOM
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db 18 ; G&W GALLERY
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db 29 ; TETRIS ATTACK
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Dups4thLetterArray:
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db "BEFAARBEKEK R-URAR INAILICE R"
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; We assume the last three arrays fit in the same $100 byte page!
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PaletteCombinations:
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palette_comb: MACRO ; Obj0, Obj1, Bg
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db \1 * 8, \2 * 8, \3 *8
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ENDM
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palette_comb 4, 4, 29
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palette_comb 18, 18, 18
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palette_comb 20, 20, 20
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palette_comb 24, 24, 24
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palette_comb 9, 9, 9
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palette_comb 0, 0, 0
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palette_comb 27, 27, 27
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palette_comb 5, 5, 5
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palette_comb 12, 12, 12
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palette_comb 26, 26, 26
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palette_comb 16, 8, 8
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palette_comb 4, 28, 28
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palette_comb 4, 2, 2
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palette_comb 3, 4, 4
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palette_comb 4, 29, 29
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palette_comb 28, 4, 28
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palette_comb 2, 17, 2
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palette_comb 16, 16, 8
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palette_comb 4, 4, 7
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palette_comb 4, 4, 18
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palette_comb 4, 4, 20
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palette_comb 19, 19, 9
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palette_comb 3, 3, 11
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palette_comb 17, 17, 2
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palette_comb 4, 4, 2
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palette_comb 4, 4, 3
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palette_comb 28, 28, 0
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palette_comb 3, 3, 0
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palette_comb 0, 0, 1
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palette_comb 18, 22, 18
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palette_comb 20, 22, 20
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palette_comb 24, 22, 24
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palette_comb 16, 22, 8
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palette_comb 17, 4, 13
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palette_comb 27, 0, 14
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palette_comb 27, 4, 15
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palette_comb 19, 22, 9
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palette_comb 16, 28, 10
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palette_comb 4, 23, 28
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palette_comb 17, 22, 2
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palette_comb 4, 0, 2
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palette_comb 4, 28, 3
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palette_comb 28, 3, 0
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palette_comb 3, 28, 4
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palette_comb 21, 28, 4
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palette_comb 3, 28, 0
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palette_comb 25, 3, 28
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palette_comb 0, 28, 8
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palette_comb 4, 3, 28
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palette_comb 28, 3, 6
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palette_comb 4, 28, 29
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; Sameboy "Exclusives"
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palette_comb 30, 30, 30 ; CGA
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palette_comb 31, 31, 31 ; DMG LCD
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palette_comb 28, 4, 1
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palette_comb 0, 0, 2
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Palettes:
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dw $7FFF, $32BF, $00D0, $0000
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dw $639F, $4279, $15B0, $04CB
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dw $7FFF, $6E31, $454A, $0000
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dw $7FFF, $1BEF, $0200, $0000
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dw $7FFF, $421F, $1CF2, $0000
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dw $7FFF, $5294, $294A, $0000
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dw $7FFF, $03FF, $012F, $0000
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dw $7FFF, $03EF, $01D6, $0000
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dw $7FFF, $42B5, $3DC8, $0000
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dw $7E74, $03FF, $0180, $0000
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dw $67FF, $77AC, $1A13, $2D6B
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dw $7ED6, $4BFF, $2175, $0000
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dw $53FF, $4A5F, $7E52, $0000
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dw $4FFF, $7ED2, $3A4C, $1CE0
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dw $03ED, $7FFF, $255F, $0000
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dw $036A, $021F, $03FF, $7FFF
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dw $7FFF, $01DF, $0112, $0000
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dw $231F, $035F, $00F2, $0009
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dw $7FFF, $03EA, $011F, $0000
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dw $299F, $001A, $000C, $0000
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dw $7FFF, $027F, $001F, $0000
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dw $7FFF, $03E0, $0206, $0120
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dw $7FFF, $7EEB, $001F, $7C00
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dw $7FFF, $3FFF, $7E00, $001F
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dw $7FFF, $03FF, $001F, $0000
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dw $03FF, $001F, $000C, $0000
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dw $7FFF, $033F, $0193, $0000
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dw $0000, $4200, $037F, $7FFF
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dw $7FFF, $7E8C, $7C00, $0000
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dw $7FFF, $1BEF, $6180, $0000
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; Sameboy "Exclusives"
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dw $7FFF, $7FEA, $7D5F, $0000 ; CGA 1
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dw $1B77, $0AD2, $25E9, $1545 ; DMG LCD
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KeyCombinationPalettes
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db 1 ; Right
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db 48 ; Left
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db 5 ; Up
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db 8 ; Down
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db 0 ; Right + A
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db 40 ; Left + A
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db 43 ; Up + A
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db 3 ; Down + A
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db 6 ; Right + B
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db 7 ; Left + B
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db 28 ; Up + B
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db 49 ; Down + B
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; Sameboy "Exclusives"
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db 51 ; Right + A + B
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db 52 ; Left + A + B
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db 53 ; Up + A + B
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db 54 ; Down + A + B
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TrademarkSymbol:
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db $3c,$42,$b9,$a5,$b9,$a5,$42,$3c
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DMGPalettes:
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dw $7FFF, $32BF, $00D0, $0000
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; Helper Functions
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DoubleBitsAndWriteRow:
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; Double the most significant 4 bits, b is shifted by 4
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ld a, 4
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ld c, 0
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.doubleCurrentBit
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sla b
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push af
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rl c
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pop af
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rl c
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dec a
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jr nz, .doubleCurrentBit
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ld a, c
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; Write as two rows
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ldi [hl], a
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inc hl
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ldi [hl], a
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inc hl
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ret
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WaitFrame:
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push hl
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ld hl, $FF0F
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res 0, [hl]
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.wait
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bit 0, [hl]
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jr z, .wait
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pop hl
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ret
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PlaySound:
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ldh [$13], a
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ld a, $87
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ldh [$14], a
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ret
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; Clear from HL to HL | 0x2000
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ClearMemoryPage:
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ldi [hl], a
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bit 5, h
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jr z, ClearMemoryPage
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ret
|
|
|
|
; c = $f0 for even lines, $f for odd lines.
|
|
ReadTileLine:
|
|
ld a, [de]
|
|
and c
|
|
ld b, a
|
|
inc e
|
|
inc e
|
|
ld a, [de]
|
|
dec e
|
|
dec e
|
|
and c
|
|
swap a
|
|
or b
|
|
bit 0, c
|
|
jr z, .dontSwap
|
|
swap a
|
|
.dontSwap
|
|
inc hl
|
|
ldi [hl], a
|
|
ret
|
|
|
|
|
|
ReadCGBLogoHalfTile:
|
|
ld c, $f0
|
|
call ReadTileLine
|
|
ld c, $f
|
|
call ReadTileLine
|
|
inc e
|
|
ld c, $f0
|
|
call ReadTileLine
|
|
ld c, $f
|
|
call ReadTileLine
|
|
inc e
|
|
ret
|
|
|
|
ReadCGBLogoTile:
|
|
call ReadCGBLogoHalfTile
|
|
ld a, e
|
|
add a, 22
|
|
ld e, a
|
|
call ReadCGBLogoHalfTile
|
|
ld a, e
|
|
sub a, 22
|
|
ld e, a
|
|
ret
|
|
|
|
|
|
ReadTrademarkSymbol:
|
|
ld de, TrademarkSymbol
|
|
ld c,$08
|
|
.loadTrademarkSymbolLoop:
|
|
ld a,[de]
|
|
inc de
|
|
ldi [hl],a
|
|
inc hl
|
|
dec c
|
|
jr nz, .loadTrademarkSymbolLoop
|
|
ret
|
|
|
|
LoadObjPalettes:
|
|
ld c, $6A
|
|
jr LoadPalettes
|
|
|
|
LoadBGPalettes:
|
|
ld c, $68
|
|
|
|
LoadPalettes:
|
|
ld a, $80
|
|
or e
|
|
ld [c], a
|
|
inc c
|
|
.loop
|
|
ld a, [hli]
|
|
ld [c], a
|
|
dec d
|
|
jr nz, .loop
|
|
ret
|
|
|
|
|
|
Preboot:
|
|
call ClearVRAMViaHDMA
|
|
; Select the first bank
|
|
xor a
|
|
ldh [$4F], a
|
|
call ClearVRAMViaHDMA
|
|
|
|
ld a, [$143]
|
|
bit 7, a
|
|
jr nz, .cgbGame
|
|
|
|
call EmulateDMG
|
|
|
|
.cgbGame
|
|
ldh [$4C], a ; One day, I will know what this switch does and how it differs from FF6C
|
|
ld a, $11
|
|
ret
|
|
|
|
EmulateDMG:
|
|
ld a, 1
|
|
ldh [$6C], a ; DMG Emulation
|
|
call GetPaletteIndex
|
|
bit 7, a
|
|
call nz, LoadDMGTilemap
|
|
and $7F
|
|
call WaitFrame
|
|
call LoadPalettesFromIndex
|
|
ld a, 4
|
|
ret
|
|
|
|
GetPaletteIndex:
|
|
ld a, [$14B] ; Old Licensee
|
|
cp $33
|
|
jr z, .newLicensee
|
|
cp 1 ; Nintendo
|
|
jr nz, .notNintendo
|
|
jr .doChecksum
|
|
.newLicensee
|
|
ld a, [$144]
|
|
cp "0"
|
|
jr nz, .notNintendo
|
|
ld a, [$145]
|
|
cp "1"
|
|
jr nz, .notNintendo
|
|
|
|
.doChecksum
|
|
ld hl, $134
|
|
ld c, $10
|
|
ld b, 0
|
|
|
|
.checksumLoop
|
|
ld a, [hli]
|
|
add b
|
|
ld b, a
|
|
dec c
|
|
jr nz, .checksumLoop
|
|
|
|
; c = 0
|
|
ld hl, TitleChecksums
|
|
|
|
.searchLoop
|
|
ld a, l
|
|
cp ChecksumsEnd & $FF
|
|
jr z, .notNintendo
|
|
ld a, [hli]
|
|
cp b
|
|
jr nz, .searchLoop
|
|
|
|
; We might have a match, Do duplicate/4th letter check
|
|
ld a, l
|
|
sub FirstChecksumWithDuplicate - TitleChecksums
|
|
jr c, .match ; Does not have a duplicate, must be a match!
|
|
; Has a duplicate; check 4th letter
|
|
push hl
|
|
ld a, l
|
|
add Dups4thLetterArray - FirstChecksumWithDuplicate - 1 ; -1 since hl was incremented
|
|
ld l, a
|
|
ld a, [hl]
|
|
pop hl
|
|
ld c, a
|
|
ld a, [$134 + 3] ; Get 4th letter
|
|
cp c
|
|
jr nz, .searchLoop ; Not a match, continue
|
|
|
|
.match
|
|
ld a, l
|
|
add PalettePerChecksum - TitleChecksums - 1; -1 since hl was incremented
|
|
ld l, a
|
|
ld a, [hl]
|
|
ret
|
|
|
|
.notNintendo
|
|
xor a
|
|
ret
|
|
|
|
LoadPalettesFromIndex: ; a = index of combination
|
|
ld b, a
|
|
; Multiply by 3
|
|
add b
|
|
add b
|
|
|
|
ld hl, PaletteCombinations
|
|
ld b, 0
|
|
ld c, a
|
|
add hl, bc
|
|
|
|
; Obj Palettes
|
|
ld e, 0
|
|
.loadObjPalette
|
|
ld a, [hli]
|
|
push hl
|
|
ld hl, Palettes
|
|
ld b, 0
|
|
ld c, a
|
|
add hl, bc
|
|
ld d, 8
|
|
call LoadObjPalettes
|
|
pop hl
|
|
bit 3, e
|
|
jr nz, .loadBGPalette
|
|
ld e, 8
|
|
jr .loadObjPalette
|
|
.loadBGPalette
|
|
;BG Palette
|
|
ld a, [hli]
|
|
ld hl, Palettes
|
|
ld b, 0
|
|
ld c, a
|
|
add hl, bc
|
|
ld d, 8
|
|
ld e, 0
|
|
call LoadBGPalettes
|
|
ret
|
|
|
|
ClearVRAMViaHDMA:
|
|
ld hl, $FF51
|
|
|
|
; Src
|
|
ld a, $D0
|
|
ld [hli], a
|
|
xor a
|
|
ld [hli], a
|
|
|
|
; Dest
|
|
ld a, $98
|
|
ld [hli], a
|
|
ld a, $A0
|
|
ld [hli], a
|
|
|
|
; Do it
|
|
ld a, $12
|
|
ld [hli], a
|
|
ret
|
|
|
|
|
|
LoadDMGTilemap:
|
|
push af
|
|
call WaitFrame
|
|
ld a,$19 ; Trademark symbol
|
|
ld [$9910], a ; ... put in the superscript position
|
|
ld hl,$992f ; Bottom right corner of the logo
|
|
ld c,$c ; Tiles in a logo row
|
|
.tilemapLoop
|
|
dec a
|
|
jr z, .tilemapDone
|
|
ldd [hl], a
|
|
dec c
|
|
jr nz, .tilemapLoop
|
|
ld l,$0f ; Jump to top row
|
|
jr .tilemapLoop
|
|
.tilemapDone
|
|
pop af
|
|
ret
|
|
|
|
SECTION "ROMMax", ROM0[$900]
|
|
; Prevent us from overflowing
|
|
ds 1
|
|
|
|
SECTION "RAM", WRAM0[$C000]
|
|
BgPalettes:
|
|
ds 8 * 4 * 2 |