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.PADTO 0x0040
VBlank:
CALL =VBLANK_Entrypoint
RETI
.PADTO 0x0100
Start:
JP =Empty_VRAM
.PADTO 0x0104
Nintendo_Logo: ; The Nintendo logo must be stored in bytes 0x104-133
.DB $CE,$ED,$66,$66,$CC,$0D,$00,$0B,$03,$73,$00,$83,$00,$0C,$00,$0D
.DB $00,$08,$11,$1F,$88,$89,$00,$0E,$DC,$CC,$6E,$E6,$DD,$DD,$D9,$99
.DB $BB,$BB,$67,$63,$6E,$0E,$EC,$CC,$DD,$DC,$99,$9F,$BB,$B9,$33,$3E
.PADTO 0x0134
Checksum: ; The bytes 0x134-0x14d need to add up to 0xe7 (= 0xff - 0x19)
.DB $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
.DB $00,$00,$00,$00,$00,$00,$00,$00,$00,$e7
Empty_VRAM: ; (Clear screen)
LD hl, $8000 ; We set the HL register to the start of VRAM
Empty_VRAM.loop:
XOR A
LD (HL+), a ; We set the memory pointed to by HL to 0 and increase HL
LD a, $a0
CP h ; Until h has reached $a0 ($a0000 is the end of VRAM)
JR NZ, =Empty_VRAM.loop
; BG Palette
LD DE, $ff47
LD A, $e4
LD (DE), A
; OBJ0 Palette
LD DE, $ff48
LD A, $e4
LD (DE), A
; LCDC
LD DE, $ff40
LD A, (DE)
OR $06
LD (DE), A
; Interrupts
LD DE, $ffff
LD A, $01
LD (DE), A
JP =Entrypoint
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