This article has a talk page!This page contains notes for the game Hudson's Adventure Island II (Game Boy).
The source code for the patch file created by Laternenschein, allowing access to the debug menu.
Rombank 1
@402B: ;; replace title screen menu call
dw $7CE6
@402F: ;; replace hidden menu call
dw $7CF3
@616F: ;; LUT for counter digits
db $30
db $31
db $32
db $33
db $34
db $35
db $36
db $37
db $38
db $39
db $41
db $42
db $43
db $44
db $45
db $46
@7CE6: ;; Title Screen B Button
ld a, [$FF00 + $8C]
bit 1, a
jp z, $42A2
ld hl, $D431
inc [hl] ;; go from 0x06 to 0x08
inc [hl]
ret
@7CF3: ;; Hidden Menu A Button
ld a, [$FF00 + $8C]
bit 0, a
jp z, $4343
ld hl, $D431
dec [hl] ;; go from 0x08 to 0x06
dec [hl]
ret
@7D00: ;; Load Graphics for Test Menu
ld hl, @7D40
@7D03:
ldi a, [hl]
and a, a
jr z, @7D3C
srl a
ld [$D642], a
ld a, $08
adc a, $00 ;; This can load to 8xxx and 9xxx in VRAM. Unused though.
swap a
ld d, a
ld a, [hl]
and a, $F0
swap a
add a, d
ld [$D643], a
ldi a, [hl]
and a, $0F
swap a
ld [$D644], a
ldi a, [hl]
ld [$D645], a
ldi a, [hl]
ld [$D646], a
push hl
@7D2D:
ld hl, $D642
ld a, [hl]
and a, a
jr z, @7D39
call $3FFC ;; Will transfer up to 4 tiles per call
jr @7D2D
@7D39:
pop hl
jr @7D03
@7D3C:
jp $3F9F
ret ;; Unnecessary
@7D40:
db $09 ;; size << 1 | destination MSB A12
db $00 ;; destination A11..A4
db $00 ;; source A14..A8
db $0B ;; source A7..A4 << 4 | source RB
db $09
db $20
db $00
db $0B
db $03
db $5C
db $07
db $AB
db $03
db $2E
db $07
db $CB
db $15
db $30
db $07
db $DB
db $0D
db $41
db $08
db $7B
db $05
db $48
db $08
db $DB
db $0B
db $4C
db $08
db $FB
db $09
db $52
db $09
db $4B
db $03
db $57
db $09
db $8B
db $03
db $59
db $09
db $9B
db $03
db $4A
db $3D
db $71
db $03
db $3D
db $3D
db $81
db $00 ;; EOL
@7D7A:
;; Letter J stolen from credits
db $03
db $00
db $03
db $00
db $03
db $00
db $03
db $00
db $63
db $00
db $73
db $00
db $3E
db $00
db $00
db $00
@7D8A:
;; New equals sign (=)
db $00
db $00
db $00
db $00
db $3C
db $00
db $00
db $00
db $3C
db $00
db $00
db $00
db $00
db $00
db $00
db $00