Initial code to support SGB, command “parsing”, replacement SGB boot ROM
This commit is contained in:
Lior Halphon
parent
a47e3cc62c
commit
44891d5c4a
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@ -0,0 +1,209 @@
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; Sameboy CGB bootstrap ROM
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; Todo: use friendly names for HW registers instead of magic numbers
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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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; Clear memory VRAM
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ld hl, $8000
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.clearVRAMLoop
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ldi [hl], a
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bit 5, h
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jr z, .clearVRAMLoop
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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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; Init BG palette to white
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ld a, $0
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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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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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; Load trademark symbol
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ld de, TrademarkSymbol
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ld c,$08
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.loadTrademarkSymbolLoop:
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ld a,[de]
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inc de
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ldi [hl],a
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inc hl
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dec c
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jr nz, .loadTrademarkSymbolLoop
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; Set up tilemap
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ld a,$19 ; Trademark symbol
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ld [$9910], a ; ... put in the superscript position
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ld hl,$992f ; Bottom right corner of the logo
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ld c,$c ; Tiles in a logo row
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.tilemapLoop
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dec a
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jr z, .tilemapDone
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ldd [hl], a
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dec c
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jr nz, .tilemapLoop
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ld l,$0f ; Jump to top row
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jr .tilemapLoop
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.tilemapDone
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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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ld a, $f1 ; Packet magic, increases by 2 for every packet
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ldh [$80], a
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ld hl, $104 ; Header start
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xor a
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ld c, a ; JOYP
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.sendCommand
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xor a
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ldh [c], a
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ld a, $30
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ldh [c], a
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ldh a, [$80]
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call SendByte
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push hl
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ld b, $e
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ld d, 0
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.checksumLoop
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call ReadHeaderByte
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add d
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ld d, a
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dec b
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jr nz, .checksumLoop
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; Send checksum
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call SendByte
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pop hl
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ld b, $e
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.sendLoop
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call ReadHeaderByte
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call SendByte
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dec b
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jr nz, .sendLoop
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; Done bit
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ld a, $20
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ldh [c], a
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ld a, $30
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ldh [c], a
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; Update command
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ldh a, [$80]
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add 2
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ldh [$80], a
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ld a, $58
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cp l
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jr nz, .sendCommand
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; Write to sound registers for DMG compatibility
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ld c, $13
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ld a, $c1
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ldh [c], a
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inc c
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ld a, 7
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ldh [c], a
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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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; Set registers to match the original SGB boot
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ld a, 1
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ld hl, $c060
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; Boot the game
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jp BootGame
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ReadHeaderByte:
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ld a, $4F
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cp l
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jr c, .zero
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ld a, [hli]
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ret
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.zero:
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inc hl
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xor a
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ret
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SendByte:
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ld e, a
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ld d, 8
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.loop
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ld a, $10
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rr e
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jr c, .zeroBit
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add a ; 10 -> 20
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.zeroBit
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ldh [c], a
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ld a, $30
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ldh [c], a
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dec d
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ret z
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jr .loop
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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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TrademarkSymbol:
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db $3c,$42,$b9,$a5,$b9,$a5,$42,$3c
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SECTION "BootGame", ROM0[$fe]
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BootGame:
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ldh [$50], a
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@ -16,13 +16,15 @@ enum model {
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MODEL_DMG,
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MODEL_CGB,
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MODEL_AGB,
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MODEL_SGB,
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};
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static const GB_model_t cocoa_to_internal_model[] =
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{
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[MODEL_DMG] = GB_MODEL_DMG_B,
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[MODEL_CGB] = GB_MODEL_CGB_E,
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[MODEL_AGB] = GB_MODEL_AGB
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[MODEL_AGB] = GB_MODEL_AGB,
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[MODEL_SGB] = GB_MODEL_SGB,
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};
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@interface Document ()
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@ -157,7 +159,7 @@ static void printImage(GB_gameboy_t *gb, uint32_t *image, uint8_t height,
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return [[NSBundle mainBundle] pathForResource:name ofType:@"bin"];
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}
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/* Todo: Unify the 3 init functions */
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/* Todo: Unify the 4 init functions */
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- (void) initDMG
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{
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current_model = MODEL_DMG;
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@ -166,6 +168,14 @@ static void printImage(GB_gameboy_t *gb, uint32_t *image, uint8_t height,
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[self initCommon];
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}
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- (void) initSGB
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{
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current_model = MODEL_SGB;
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GB_init(&gb, cocoa_to_internal_model[current_model]);
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GB_load_boot_rom(&gb, [[self bootROMPathForName:@"sgb_boot"] UTF8String]);
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[self initCommon];
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}
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- (void) initCGB
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{
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if ([[NSUserDefaults standardUserDefaults] boolForKey:@"EmulateAGB"]) {
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@ -274,7 +284,7 @@ static void printImage(GB_gameboy_t *gb, uint32_t *image, uint8_t height,
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current_model = (enum model)[sender tag];
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}
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static NSString * const boot_names[] = {@"dmg_boot", @"cgb_boot", @"agb_boot"};
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static NSString * const boot_names[] = {@"dmg_boot", @"cgb_boot", @"agb_boot", @"sgb_boot"};
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GB_load_boot_rom(&gb, [[self bootROMPathForName:boot_names[current_model - 1]] UTF8String]);
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if ([sender tag] == MODEL_NONE) {
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@ -287,7 +297,8 @@ static void printImage(GB_gameboy_t *gb, uint32_t *image, uint8_t height,
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if ([sender tag] != 0) {
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/* User explictly selected a model, save the preference */
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[[NSUserDefaults standardUserDefaults] setBool:current_model == MODEL_DMG forKey:@"EmulateDMG"];
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[[NSUserDefaults standardUserDefaults] setBool:current_model== MODEL_AGB forKey:@"EmulateAGB"];
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[[NSUserDefaults standardUserDefaults] setBool:current_model == MODEL_SGB forKey:@"EmulateSGB"];
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[[NSUserDefaults standardUserDefaults] setBool:current_model == MODEL_AGB forKey:@"EmulateAGB"];
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}
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/* Reload the ROM, SAV and SYM files */
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@ -382,6 +393,9 @@ static void printImage(GB_gameboy_t *gb, uint32_t *image, uint8_t height,
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if ([[NSUserDefaults standardUserDefaults] boolForKey:@"EmulateDMG"]) {
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[self initDMG];
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}
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else if ([[NSUserDefaults standardUserDefaults] boolForKey:@"EmulateSGB"]) {
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[self initSGB];
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}
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else {
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[self initCGB];
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}
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@ -1,7 +1,8 @@
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="9531" systemVersion="14F1713" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
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<?xml version="1.0" encoding="UTF-8"?>
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<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="13771" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
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<dependencies>
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<plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="9531"/>
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<deployment identifier="macosx"/>
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<plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="13771"/>
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</dependencies>
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<objects>
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<customObject id="-2" userLabel="File's Owner" customClass="NSApplication">
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@ -311,7 +312,13 @@
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</menu>
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</menuItem>
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<menuItem isSeparatorItem="YES" id="5GS-tt-E0a"/>
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<menuItem title="Game Boy" tag="1" id="vc7-yy-ARW">
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<menuItem title="Game Boy" tag="1" id="g7C-LA-VAr">
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<modifierMask key="keyEquivalentModifierMask"/>
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<connections>
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<action selector="reset:" target="-1" id="rxG-cz-s1S"/>
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</connections>
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</menuItem>
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<menuItem title="Super Game Boy" tag="4" id="vc7-yy-ARW">
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<modifierMask key="keyEquivalentModifierMask"/>
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<connections>
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<action selector="reset:" target="-1" id="E4M-QG-ua9"/>
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19
Core/gb.c
19
Core/gb.c
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@ -506,7 +506,12 @@ bool GB_is_inited(GB_gameboy_t *gb)
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bool GB_is_cgb(GB_gameboy_t *gb)
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{
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return ((gb->model) & GB_MODEL_FAMILY_MASK) == GB_MODEL_CGB_FAMILY;
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return (gb->model & GB_MODEL_FAMILY_MASK) == GB_MODEL_CGB_FAMILY;
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}
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bool GB_is_sgb(GB_gameboy_t *gb)
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{
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return (gb->model & ~GB_MODEL_PAL_BIT) == GB_MODEL_SGB || gb->model == GB_MODEL_SGB2;
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}
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void GB_set_turbo_mode(GB_gameboy_t *gb, bool on, bool no_frame_skip)
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@ -541,6 +546,8 @@ static void reset_ram(GB_gameboy_t *gb)
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break;
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case GB_MODEL_DMG_B:
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case GB_MODEL_SGB_NTSC: /* Unverified*/
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case GB_MODEL_SGB_PAL: /* Unverified */
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for (unsigned i = 0; i < gb->ram_size; i++) {
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gb->ram[i] = (random() & 0xFF);
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if (i & 0x100) {
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@ -551,15 +558,13 @@ static void reset_ram(GB_gameboy_t *gb)
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}
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}
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break;
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#if 0
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/* Not emulated yet, for documentation only */
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case GB_MODEL_SGB2:
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for (unsigned i = 0; i < gb->ram_size; i++) {
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gb->ram[i] = 0x55;
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gb->ram[i] ^= random() & random() & random();
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}
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break;
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#endif
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case GB_MODEL_CGB_C:
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for (unsigned i = 0; i < gb->ram_size; i++) {
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@ -729,5 +734,11 @@ void GB_set_clock_multiplier(GB_gameboy_t *gb, double multiplier)
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uint32_t GB_get_clock_rate(GB_gameboy_t *gb)
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{
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if (gb->model == GB_MODEL_SGB_NTSC) {
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return SGB_NTSC_FREQUENCY * gb->clock_multiplier;
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}
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if (gb->model == GB_MODEL_SGB_PAL) {
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return SGB_PAL_FREQUENCY * gb->clock_multiplier;
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}
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return CPU_FREQUENCY * gb->clock_multiplier;
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}
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20
Core/gb.h
20
Core/gb.h
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@ -19,6 +19,7 @@
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#include "rewind.h"
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#include "z80_cpu.h"
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#include "symbol_hash.h"
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#include "sgb.h"
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#define GB_STRUCT_VERSION 13
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@ -27,6 +28,7 @@
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#define GB_MODEL_DMG_FAMILY 0x000
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#define GB_MODEL_MGB_FAMILY 0x100
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#define GB_MODEL_CGB_FAMILY 0x200
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#define GB_MODEL_PAL_BIT 0x1000
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#endif
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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@ -48,15 +50,18 @@ typedef union {
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uint8_t data[5];
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} GB_rtc_time_t;
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typedef enum {
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// GB_MODEL_DMG_0 = 0x000,
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// GB_MODEL_DMG_A = 0x001,
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GB_MODEL_DMG_B = 0x002,
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// GB_MODEL_DMG_C = 0x003,
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// GB_MODEL_SGB = 0x004,
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GB_MODEL_SGB = 0x004,
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GB_MODEL_SGB_NTSC = GB_MODEL_SGB,
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GB_MODEL_SGB_PAL = 0x1004,
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// GB_MODEL_MGB = 0x100,
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// GB_MODEL_SGB2 = 0x101,
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GB_MODEL_SGB2 = 0x101,
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// GB_MODEL_CGB_0 = 0x200,
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// GB_MODEL_CGB_A = 0x201,
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// GB_MODEL_CGB_B = 0x202,
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@ -203,6 +208,8 @@ typedef enum {
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#ifdef GB_INTERNAL
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#define LCDC_PERIOD 70224
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#define CPU_FREQUENCY 0x400000
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#define SGB_NTSC_FREQUENCY (21477272 / 5)
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#define SGB_PAL_FREQUENCY (21281370 / 5)
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#define DIV_CYCLES (0x100)
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#define INTERNAL_DIV_CYCLES (0x40000)
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@ -459,6 +466,14 @@ struct GB_gameboy_internal_s {
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uint8_t mode_for_interrupt;
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bool lyc_interrupt_line;
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);
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/* Super Game Boy state, only dumped/loaded for relevant models */
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GB_SECTION(sgb,
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uint8_t sgb_command[16];
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uint8_t sgb_command_write_index;
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bool sgb_ready_for_pulse;
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bool sgb_ready_for_write;
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);
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/* Unsaved data. This includes all pointers, as well as everything that shouldn't be on a save state */
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/* This data is reserved on reset and must come last in the struct */
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@ -584,6 +599,7 @@ __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
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void GB_init(GB_gameboy_t *gb, GB_model_t model);
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bool GB_is_inited(GB_gameboy_t *gb);
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bool GB_is_cgb(GB_gameboy_t *gb);
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bool GB_is_sgb(GB_gameboy_t *gb);
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GB_model_t GB_get_model(GB_gameboy_t *gb);
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void GB_free(GB_gameboy_t *gb);
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void GB_reset(GB_gameboy_t *gb);
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@ -47,12 +47,14 @@ void GB_update_joyp(GB_gameboy_t *gb)
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default:
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break;
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}
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if (previous_state != (gb->io_registers[GB_IO_JOYP] & 0xF)) {
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/* The joypad interrupt DOES occur on CGB (Tested on CGB-CPU-06), unlike what some documents say. */
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gb->io_registers[GB_IO_IF] |= 0x10;
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gb->stopped = false;
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}
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gb->io_registers[GB_IO_JOYP] |= 0xC0; // No SGB support
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gb->io_registers[GB_IO_JOYP] |= 0xC0;
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}
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void GB_set_key_state(GB_gameboy_t *gb, GB_key_t index, bool pressed)
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@ -271,6 +271,9 @@ static uint8_t read_high_memory(GB_gameboy_t *gb, uint16_t addr)
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return gb->extra_oam[addr - 0xfea0];
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case GB_MODEL_DMG_B:
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case GB_MODEL_SGB_NTSC:
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case GB_MODEL_SGB_PAL:
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case GB_MODEL_SGB2:
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;
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}
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||||
}
|
||||
|
|
@ -575,6 +578,9 @@ static void write_high_memory(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
|
|||
gb->extra_oam[addr - 0xfea0] = value;
|
||||
break;
|
||||
case GB_MODEL_DMG_B:
|
||||
case GB_MODEL_SGB_NTSC:
|
||||
case GB_MODEL_SGB_PAL:
|
||||
case GB_MODEL_SGB2:
|
||||
case GB_MODEL_CGB_E:
|
||||
case GB_MODEL_AGB:
|
||||
break;
|
||||
|
|
@ -727,6 +733,7 @@ static void write_high_memory(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
|
|||
gb->io_registers[GB_IO_JOYP] &= 0x0F;
|
||||
gb->io_registers[GB_IO_JOYP] |= value & 0xF0;
|
||||
GB_update_joyp(gb);
|
||||
GB_sgb_write(gb, value);
|
||||
return;
|
||||
|
||||
case GB_IO_BIOS:
|
||||
|
|
|
|||
|
|
@ -0,0 +1,51 @@
|
|||
#include "sgb.h"
|
||||
|
||||
void GB_sgb_write(GB_gameboy_t *gb, uint8_t value)
|
||||
{
|
||||
if (!GB_is_sgb(gb)) return;
|
||||
switch ((value >> 4) & 3 ) {
|
||||
case 3:
|
||||
gb->sgb_ready_for_pulse = true;
|
||||
break;
|
||||
|
||||
case 2: // Zero
|
||||
if (!gb->sgb_ready_for_pulse || !gb->sgb_ready_for_write) return;
|
||||
if (gb->sgb_command_write_index >= sizeof(gb->sgb_command) * 8) {
|
||||
GB_log(gb, "Got SGB command: ");
|
||||
for (unsigned i = 0; i < 16; i++) {
|
||||
GB_log(gb, "%02x ", gb->sgb_command[i]);
|
||||
}
|
||||
GB_log(gb, "\n");
|
||||
gb->sgb_ready_for_pulse = false;
|
||||
gb->sgb_ready_for_write = false;
|
||||
}
|
||||
else {
|
||||
gb->sgb_command_write_index++;
|
||||
gb->sgb_ready_for_pulse = false;
|
||||
}
|
||||
break;
|
||||
case 1: // One
|
||||
if (!gb->sgb_ready_for_pulse || !gb->sgb_ready_for_write) return;
|
||||
if (gb->sgb_command_write_index >= sizeof(gb->sgb_command) * 8) {
|
||||
GB_log(gb, "Corrupt SGB command.\n");
|
||||
gb->sgb_ready_for_pulse = false;
|
||||
gb->sgb_ready_for_write = false;
|
||||
}
|
||||
else {
|
||||
gb->sgb_command[gb->sgb_command_write_index / 8] |= 1 << (gb->sgb_command_write_index & 7);
|
||||
gb->sgb_command_write_index++;
|
||||
gb->sgb_ready_for_pulse = false;
|
||||
}
|
||||
break;
|
||||
|
||||
case 0:
|
||||
gb->sgb_ready_for_pulse = false;
|
||||
gb->sgb_ready_for_write = true;
|
||||
gb->sgb_command_write_index = 0;
|
||||
memset(gb->sgb_command, 0, sizeof(gb->sgb_command));
|
||||
break;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,9 @@
|
|||
#ifndef sgb_h
|
||||
#define sgb_h
|
||||
#include "gb.h"
|
||||
|
||||
#ifdef GB_INTERNAL
|
||||
void GB_sgb_write(GB_gameboy_t *gb, uint8_t value);
|
||||
#endif
|
||||
|
||||
#endif
|
||||
9
Makefile
9
Makefile
|
|
@ -106,9 +106,9 @@ endif
|
|||
|
||||
cocoa: $(BIN)/SameBoy.app
|
||||
quicklook: $(BIN)/SameBoy.qlgenerator
|
||||
sdl: $(SDL_TARGET) $(BIN)/SDL/dmg_boot.bin $(BIN)/SDL/cgb_boot.bin $(BIN)/SDL/agb_boot.bin $(BIN)/SDL/LICENSE $(BIN)/SDL/registers.sym $(BIN)/SDL/background.bmp $(BIN)/SDL/Shaders
|
||||
bootroms: $(BIN)/BootROMs/agb_boot.bin $(BIN)/BootROMs/cgb_boot.bin $(BIN)/BootROMs/dmg_boot.bin
|
||||
tester: $(TESTER_TARGET) $(BIN)/tester/dmg_boot.bin $(BIN)/tester/cgb_boot.bin $(BIN)/tester/agb_boot.bin
|
||||
sdl: $(SDL_TARGET) $(BIN)/SDL/dmg_boot.bin $(BIN)/SDL/cgb_boot.bin $(BIN)/SDL/agb_boot.bin $(BIN)/SDL/sgb_boot.bin $(BIN)/SDL/LICENSE $(BIN)/SDL/registers.sym $(BIN)/SDL/background.bmp $(BIN)/SDL/Shaders
|
||||
bootroms: $(BIN)/BootROMs/agb_boot.bin $(BIN)/BootROMs/cgb_boot.bin $(BIN)/BootROMs/dmg_boot.bin $(BIN)/BootROMs/sgb_boot.bin
|
||||
tester: $(TESTER_TARGET) $(BIN)/tester/dmg_boot.bin $(BIN)/tester/cgb_boot.bin $(BIN)/tester/agb_boot.bin $(BIN)/tester/sgb_boot.bin
|
||||
all: cocoa sdl tester libretro
|
||||
|
||||
# Get a list of our source files and their respective object file targets
|
||||
|
|
@ -180,6 +180,7 @@ $(BIN)/SameBoy.app: $(BIN)/SameBoy.app/Contents/MacOS/SameBoy \
|
|||
$(BIN)/SameBoy.app/Contents/Resources/dmg_boot.bin \
|
||||
$(BIN)/SameBoy.app/Contents/Resources/cgb_boot.bin \
|
||||
$(BIN)/SameBoy.app/Contents/Resources/agb_boot.bin \
|
||||
$(BIN)/SameBoy.app/Contents/Resources/sgb_boot.bin \
|
||||
$(patsubst %.xib,%.nib,$(addprefix $(BIN)/SameBoy.app/Contents/Resources/Base.lproj/,$(shell cd Cocoa;ls *.xib))) \
|
||||
$(BIN)/SameBoy.qlgenerator \
|
||||
Shaders
|
||||
|
|
@ -307,7 +308,7 @@ $(BIN)/BootROMs/%.bin: BootROMs/%.asm
|
|||
-@$(MKDIR) -p $(dir $@)
|
||||
cd BootROMs && rgbasm -o ../$@.tmp ../$<
|
||||
rgblink -o $@.tmp2 $@.tmp
|
||||
head -c $(if $(findstring dmg,$@), 256, 2304) $@.tmp2 > $@
|
||||
head -c $(if $(findstring dmg,$@)$(findstring sgb,$@), 256, 2304) $@.tmp2 > $@
|
||||
@rm $@.tmp $@.tmp2
|
||||
|
||||
# Libretro Core (uses its own build system)
|
||||
|
|
|
|||
Loading…
Reference in New Issue