57 lines
1.6 KiB
NASM
57 lines
1.6 KiB
NASM
; =============================================================================
|
|
; Key Block Object like Link's Awakening
|
|
; Overwrites the Prison Door
|
|
;
|
|
; Author: XaserLE
|
|
; Thanks: - PuzzleDude for finding a drawing bug and get rid of it
|
|
; - MathOnNapkins' Zelda Doc's
|
|
; - wiiqwertyuiop for his Zelda Disassembly
|
|
;
|
|
; The blocks can be opened from up- or downside only
|
|
; left and right will not work (will try to fix this in the future).
|
|
;
|
|
; The key block must always be placed on EVEN x and y.
|
|
; 00, 02, 04, 06, 08, 0A, 0C, 0E
|
|
; =============================================================================
|
|
|
|
org $01EB8C
|
|
Object_KeyBlock:
|
|
{
|
|
LDA $7EF36F ; load the small key counter
|
|
AND #$00FF ; check if we have at least one small key (AND will not be zero)
|
|
BEQ $4C ; if not (AND is zero), do nothing
|
|
|
|
; otherwise we will decrement the small key counter
|
|
; and branch to the code that opens the prison door
|
|
|
|
LDA $7EF36F ; reload small key counter
|
|
DEC A ; remove one key
|
|
STA $7EF36F ; save the new value at small key counter position
|
|
BRA $05 ; branch to the code that opens the prison door
|
|
|
|
; Fix draw bug from floor tile left by block after unlock.
|
|
org $01EBC8
|
|
LDA.w $9B5A,y
|
|
|
|
org $01EBD1
|
|
LDA.w $9B54,y
|
|
|
|
org $01EBDA
|
|
LDA.w $9B5C,y
|
|
|
|
; Draw Values
|
|
; 50 - /
|
|
; 52 - normal
|
|
; 54 - x mirror
|
|
; 56 - normal
|
|
; 58 - x mirror
|
|
; 5A - y mirror
|
|
; 5C - xy mirror
|
|
; 5E - y mirror
|
|
}
|
|
|
|
; =============================================================================
|
|
|
|
; Big chest key for compass
|
|
org $01EC1A
|
|
db $66 |