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; .INCLUDE "minimal.gbasm"
LD SP,$fffe
EmptyVRAM:
LD HL, $8000
EmptyVRAM.loop:
LD A, $00
LD (HL+), A
LD A, $A0
CP H
JR NZ, =EmptyVRAM.loop
SetupLogoTile:
LD C, $48
LD DE, =Logo
LD HL, $8010
SetupLogoTile.loop:
LD A, (DE)
LD (HL+), A
LD (HL+), A
LD (HL+), A
LD (HL+), A
INC DE
DEC C
LD A, $00
CP C
JR NZ, =SetupLogoTile.loop
LD A, $01
LD ($8092), A
LD ($8093), A
LD C, $10
SetupHeart.loop:
LD A, (DE)
LD (HL+), A
LD (HL+), A
INC DE
DEC C
LD A, $00
CP C
JR NZ, =SetupHeart.loop
LD A, $01
LogoFirstLine:
LD HL, $9905
LogoFirstLine.loop:
LD (HL+), A
INC A
CP $0a
JR NZ, =LogoFirstLine.loop
LD (HL), $14
LogoSecondLine:
LD HL, $9925
LogoSecondLine.loop:
LD (HL+), A
INC A
CP $13
JR NZ, =LogoSecondLine.loop
LD A, $13
LD ($98ee), A
; Palette
LD A, $fc
LD ($47), A
LD ($43), A
; LCD on
LD A, $91
LD ($42), A
LD ($40), A
; Sound on
LD A, $80
LD ($26), A
; Channel 1 lengths
LD ($11), A
LD A, $f3
; Channel 1 volume & envelope
LD ($12), A
; Panning
LD ($25), A
LD A, $77
LD ($24), A
LD C, $58
Loop:
LD B, $12
.Wait_VBlank:
LD A, ($44)
CP $90
JR NZ, =.Wait_VBlank
DEC B
LD A, $00
CP B
JR NZ, =.Wait_VBlank
LD A, C
LD ($42), A
DEC C
CP $06
LD D, $83
CALL Z, =.sound1
CP $04
JR NZ, =Loop
LD D, $c1
CALL =.sound1
.Lock:
JP =End
.sound1:
LD E, A
LD A, D
LD ($13), A
LD A, $87
LD ($14), A
LD A, E
RET
Logo:
.DB $3f, $ff, $f0, $f0
.DB $c0, $f0, $f0, $f0
.DB $00, $00, $00, $fe
.DB $00, $1e, $7f, $1e
.DB $00, $00, $80, $1f
.DB $00, $01, $07, $e1
.DB $03, $e3, $f8, $e3
.DB $c0, $c0, $00, $cf
.DB $00, $01, $01, $3c
.DB $ff, $f0, $f0, $f0
.DB $f3, $f0, $f0, $f0
.DB $e0, $fe, $1f, $fe
.DB $1e, $1e, $9e, $1e
.DB $00, $1f, $78, $1f
.DB $79, $f9, $79, $f9
.DB $e3, $e3, $e3, $e3
.DB $cf, $cf, $cf, $cf
.DB $cf, $0f, $0f, $0f
Heart:
.DB $00, $00, $00, $00, $00, $00, $00, $7c
.DB $82, $29, $55, $45, $29, $11, $82, $7c
.PADTO 0xfc
End:
LD A, $01
LD ($50), A
|
