Parallel Worlds add-on patch by Conn

Get shovel in menu instead of empty space (patch changes empty space used for bottle content to get shovel there) 

Bottle content is saved to unused 7E/D100, and 7E/D101 is used to check whether bottle is equipped 

Apply on Parallel Worlds-prepatched ALTTP.


Still needs to be done:
- The current version (1.1) does not have a shovel, you must place it in a chest via Hyrule Magic
- Hide some treasures to dig up ;) 


ips for rom without header (Parallel_Worlds_shovel.ips) 
or for rom with header (Parallel_Worlds_shovel_header.ips)  



(1) shovel gfx in menu

06/e46f: 51 -> 11
06/e517: a9 5c 2c 8d 58 14 8d 5a 14 8d 98 14 8d 9a 14 -> ea ea ea ea ea ea ea ea ea ea ea ea ea ea ea
06/ebb0: ad 02 02 -> 20 a0 ea (hijack code show letters "shovel" in menu)
06/eaa0: 
ad 02 02 
29 ff 00
c9 10 00 ; check if position 10 (bottle)
d0 04
a9 18 00
aa       ; transfer pointer 18 for shovel to X
ad 02 02
60

06/fb60: ea 85 02 -> 20 c0 ea set pointers to show shovel as Y item in box when playing 
06/eac0:
85 02
e2 30
af 01 d1 7e ;check if bottle is equipped
c9 00
d0 06  ; if not branch
e0 10
d0 02
a2 0d
c2 30
60


(2)load/store bottle content to 7E/d100

06/de0c: af f4 f3 7e -> af 00 d1 7e
06/E59f: 8f 4f f3 7e -> 8f 00 d1 7e
06/ebbb: af 4f f3 7e -> af 00 d1 7e
06/fae3: af 4f f3 7e -> af 00 d1 7e



(3) make bottle selectable item

06/de3d: d0 -> 80  
06/de9d: d0 -> 80
06/E588: d0 -> 80


(4) check if 7e/0202 is bottle or shovel, save 01 to unused 7e/d101 if bottle, 00 if shovel

06/faeb: a9 10 00 -> 20 20 ea (hijack code to unused 06/ea20, executed from menu to game if $0202 > 15 -> bottle)
06/ea20: 
a9 01 00 
8f 01 d1 7e ; store 01 to 7e/d101 to keep saved that bottle and not shovel is chosen
a9 10 00    ; store 10 to $0202 
60 

06/e5db: af 4f f3 7e 18 69 14-> 20 50 ea ea ea ea ea (hijack code to 06/ea50, executed from game to menu only when $0202 is 10)
06/ea50: 
af 01 d1 7e 
c9 01        ;check if bottle is in Y button-box (equipped)
f0 03 
a9 10        
60           ;if not, return  
a9 00         
8f 01 d1 7e  ; reset 7e/d101 
af 00 d1 7e  ; load bottle number
18 
69 14        ; add 14 to get to correct bottle in menu
60 

06/fada: 9b aa 80 14 -> 4c 70 ea ea (hijack code to 06/ea70; executed from menu to game to put correct Y item to use)
06/ea70: 
9b 
aa 
af 01 d1 7e ; check if bottle is chosen
c9 01 00
f0 0b       ; if yes branch
af 4f f3 7e ; if not load shovel
29 ff 00 
bb
4c fa fa 
af 00 d1 7e ; load bottle number
29 ff 00 
aa 
bf 5b f3 7e ; load bottle content 
29 ff 00 
bb 
4c fa fa

 
(5) use of items:

04/850E: 4c -> 4f (to store shovel at 7e/f34f) when you get it

03/A166: AF 4F F3 7E -> af 00 d1 7e (enable bottle use (remap))

pointer: 03/9afa 5b a1 -> 13 a3

03/A313: AF 4C F3 7E -> 5c e0 ea 0d (hijack code to distinguish between bottle, flute and shovel)
06/eae0:
af 01 d1 7e ; check if bottle is in Y
c9 00
F0 04 ; branch if not
5c 5b a1 07; jump to bottle pointer (overwritten at pointer above)
ad 02 02
c9 0d      ; check if flute
d0 08      ; if not branch
af 4c f3 7e; load flute
5c 1d a3 07; return to fluteload
af 4f f3 7e; check status of 7e/f34e
c9 00 
d0 04
5c 12 a3 07; if no value return
c9 01
d0 04
5c 2c a3 07; if shovel run execution
5c 1d a3 07; if any other value return to flute load




(6) further changes
(don't know when these are executed, but safe is safe, otherwise you may get a shovel with a bottle!)
06/de29: 8f 4f f3 7E -> 8f 00 d1 7e
06/e168: 8f 4f f3 7E -> 8f 00 d1 7e (think this is run when you receive a bottle)