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|
SECTION "main",rom0
; set up stack
ld sp,$fffe
ld a,$30
ld [$ff00],a
; clear vram ($8000–9fff)
xor a
ld hl,$9fff
vloop:
ld [hld],a
bit 7,h
jr nz,vloop
; set up audio
ld hl,$ff26
ld c,$11
ld a,$80
ld [hld],a
ld [$ff00+c],a
inc c
ld a,$f3
ld [$ff00+c],a
ld [hld],a
ld a,$77
ld [hl],a
; set background palette
ld a,%11111100
ld [$ff47],a
ld hl,$c05f
ld c,8
xor a
loop2b:
ld [hld],a
dec c
jr nz,loop2b
ld de,$014f
ld a,$fb
ld c,6
loop36:
push af
ld b,0
loop39:
ld a,[de]
dec de
ld [hld],a
add b
ld b,a
dec c
jr nz,loop39
ld [hld],a
pop af
ld [hld],a
ld c,$e
sub 2
cp $ef
jr nz,loop36
; convert and load logo data from cart into vram
ld de,$0104
ld hl,$8010
lloop:
ld a,[de]
call Graphics
call Graphics2
inc de
ld a,e
cp $34
jr nz,lloop
; load 8 additional bytes into vram
ld de,registered
ld b,registered_ - registered
eloop:
ld a,[de]
inc de
ld [hli],a
inc hl
dec b
jr nz,eloop
; set background tilemap
ld a,$19
ld [$9910],a
ld hl,$992f
oloop:
ld c,$0c
iloop:
dec a
jr z,scroll
ld [hld],a
dec c
jr nz,iloop
ld l,$f
jr oloop
scroll:
; turn on lcd (showing background)
ld a,$91
ld [$ff40],a
ld hl,$c000
ld c,0
loop89:
ld a,0
ld [$ff00+c],a
ld a,$30
ld [$ff00+c],a
ld b,$10
loop91:
ld e,8
ld a,[hli]
ld d,a
loop95:
bit 0,d
ld a,$10
jr nz,loop9d
ld a,$20
loop9d:
ld [$ff00+c],a
ld a,$30
ld [$ff00+c],a
rr d
dec e
jr nz,loop95
dec b
jr nz,loop91
ld a,$20
ld [$ff00+c],a
ld a,$30
ld [$ff00+c],a
call funcc2
ld a,l
cp $60
jr nz,loop89
ld c,$13
ld a,$c1
ld [$ff00+c],a
inc c
ld a,7
ld [$ff00+c],a
jr end
funcc2:
ld d,4
loopc4:
ld a,[$ff44]
cp $90
jr nz,loopc4
ld e,0
loopcc:
dec e
jr nz,loopcc
dec d
jr nz,loopc4
ret
Graphics:
ld c,a
Graphics2:
ld b,4
loopd6:
push bc
rl c
rla
pop bc
rl c
rla
dec b
jr nz,loopd6
ld [hli],a
inc hl
ld [hli],a
inc hl
ret
registered:
INCBIN "®.bin"
registered_:
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
nop
end:
ld a,-1
ld [$ff50],a ; turn off bootrom
|
