Pokémon Yellow predefined functions list: Difference between revisions
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This is a list of {{Y}} predefined functions. All values are in [[hexadecimal]].
Some values that are stated "Nonfunctional" and "Softlock" may do something when certain conditions are met.
==Executing predefined functions==
===Hacked ROM===
Predefined functions can be executed with [
In at least the latest revision, one must use the debug item, select "Miscellaneous", scroll down to "Predef [7 heal]", adjust the value with right (ID +01h) and/or left (ID+10h) and press A to run the predefined function.
Line 14:
01 - 03: Nonfunctional
04: Writes random garbage to tile graphics
05 - 06: Nonfunctional
Line 30:
0D - 0E: Softlock
0F: Initialises Player Data (Party, items, badges only)
10 - 17: Nonfunctional
18:
19 - 1A: Nonfunctional
Line 58:
29: Pokedex menu
2A
2B: Saves the game to SRAM0
2C: Battle start, works
Line 64 ⟶ 66:
2D: Nonfunctional
2E:
2F: Trade, nonfunctional
30:
31: Small amounts of tile corruption, text to be specific.
32: Plays the Intro. Returns to the overworld when finished, but does not reload graphics. Any NPCs onscreen will show on-screen during intro.
33: Nonfunctional
34: Flashes the screen indefinitely.
35: Nonfunctional
Line 88 ⟶ 90:
39 - 3A: Nonfunctional
3B: All tiles and sound filled with garbage.
3C: Cut, working
Line 114 ⟶ 116:
4B: Nonfunctional
4C: Displays Emotion Bubble. Replaces text tiles 2, 3, 4, and 5 with "Trainer spotted you!" bubble.
4D: Nonfunctional
Line 122 ⟶ 124:
4F: Softlock
50: Saves to SRAM2
50 - 51: Nonfunctional▼
52: Goes to a white screen and forcibly loads the save file, gives "file data is destroyed!" message if one does not exist. Pokemon and item data is loaded correctly however the tileset for the map is not changed if the save was in a different map.
53:
54: "Wanna trade CLEFAIRY for MR.MIME?"
55: Enter Hall of Fame, then credits. Works, but
56: Professor Oak's Rating
Line 142 ⟶ 146:
5C - 60: Nonfunctional
61: Elevator menu with invalid floors. The menu may display mart items. If inside an Elevator after selecting an option, the elevator will move after exiting the menu but you will exit to a glitched map.
62: If you caught 0 kinds of pokemon, get item 0x00.
Line 176 ⟶ 180:
A1: Softlock
A2: "[]5 error." where [] = tile 25
A3 - A5: Softlock
Line 190 ⟶ 194:
AA: Nonfunctional
AB: Battle HUD appears, then "It's not very effective..." appears
AC: See 92
Line 198 ⟶ 202:
AE: Nonfunctional
AF: 3TRAINERPOKe (that always turns into a Rhydon, not due to the [[Rhydon trap]]) was caught!
B0: Text scramble, then crash
Line 206 ⟶ 210:
B6: Pops all text boxes
B7 - FF: Softlock/Nonfunctional
[[Category:Databases]]
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Latest revision as of 01:45, 29 May 2022
This is a list of Pokémon Yellow predefined functions. All values are in hexadecimal.
Some values that are stated "Nonfunctional" and "Softlock" may do something when certain conditions are met.
Executing predefined functions
Hacked ROM
Predefined functions can be executed with TheZZAZZGlitch's debug Pokémon Yellow by using the "Debug" item (known as "31337" in earlier ROMs), which can be withdrawn from the player's PC at the beginning of the game or added as item 1 with the GameShark code 012C1DD3.
In at least the latest revision, one must use the debug item, select "Miscellaneous", scroll down to "Predef [7 heal]", adjust the value with right (ID +01h) and/or left (ID+10h) and press A to run the predefined function.
List of predefined functions
00: Shows in-battle HUD for exactly 5 frames
01 - 03: Nonfunctional
04: Writes random garbage to tile graphics. Effect is cosmetic.
05 - 06: Nonfunctional
07: Instant Pokemon Center (no animation, but HP and PP refilled and status restored to normal)
08: Nonfunctional
09: Softlock
0A: Softlock
0B - 0C: Nonfunctional
0D - 0E: Softlock
0F: Initialises Player Data (Party, items, badges only)
10 - 17: Nonfunctional
18: Initialises Player Data
19 - 1A: Nonfunctional
1B: First PKMN learns move named <insert first item in bag here>, but doesn't actually work
1C - 1E: Nonfunctional
1F: Poison screen flash, no sound effect or health decrease
20: Disables Up and Down button input, menus included. (Curious.)
21: Vertical screen shake
22 - 23: Nonfunctional
24: Horizontal screen shake
25: Softlock
26 - 28: Nonfunctional
29: Pokedex menu
2A: Nonfunctional
2B: Saves the game to SRAM0
2C: Battle start, works
2D: Nonfunctional
2E: Draws the 8 badges on the Trainer menu for 5 frames (uses the tileset of the loaded map)
2F: Trade, nonfunctional
30: Plays the battle transition
31: Small amounts of tile corruption, text to be specific.
32: Plays the Intro. Returns to the overworld when finished, but does not reload graphics. Any NPCs onscreen will show on-screen during intro.
33: Nonfunctional
34: Flashes the screen indefinitely.
35: Nonfunctional
36: First page of first pokemon's stats
37: Second page of first pokemon's stats
38: Functional trade
39 - 3A: Nonfunctional
3B: All tiles and sound filled with garbage.
3C: Cut, working
3D: Pokedex data... of Hitmonchan.
3E: Nonfunctional
3F: Working save
40: Hangs for exactly 15 frames
41 - 45: Nonfunctional
46: Softlock
47: Nonfunctional
48: Softlock
49: Heals opponent in battle, outside of battle HUD replaced with text
4A: Hitmonchan's Nest page
4B: Nonfunctional
4C: Displays Emotion Bubble. Replaces text tiles 2, 3, 4, and 5 with "Trainer spotted you!" bubble.
4D: Nonfunctional
4E: "Nickname?" for Hitmonchan
4F: Softlock
50: Saves to SRAM2
51: Nonfunctional
52: Goes to a white screen and forcibly loads the save file, gives "file data is destroyed!" message if one does not exist. Pokemon and item data is loaded correctly however the tileset for the map is not changed if the save was in a different map.
53: Saves to SRAM1
54: "Wanna trade CLEFAIRY for MR.MIME?"
55: Enter Hall of Fame, then credits. Works, but then dumps you back into whatever state you were in before calling. Does not reload graphics.
56: Professor Oak's Rating
57: Softlock
58 - 5A: Nonfunctional
5B: First item used Strength, functional
5C - 60: Nonfunctional
61: Elevator menu with invalid floors. The menu may display mart items. If inside an Elevator after selecting an option, the elevator will move after exiting the menu but you will exit to a glitched map.
62: If you caught 0 kinds of pokemon, get item 0x00.
63 - 81: Softlock
82: Nonfunctional
83 - 8C: Softlock
8D: Small screen corruption, then softlock
8E - 8F: Softlock
90: Nonfunctional
91: Softlock
92: Text Box full of "BLUE" and whitespace
93: Screen fills with second tile of "GYM" and crash.
94: Nonfunctional
95 - 98: Softlock
99: Nonfunctional
9A - 9F: Softlock
A0: Nonfunctional
A1: Softlock
A2: "[]5 error." where [] = tile 25
A3 - A5: Softlock
A6: Nonfunctional
A7: Text box similar to 92 but filled with "LAPRAS" instead of "BLUE".
A8: Nonfunctional
A9: Softlock
AA: Nonfunctional
AB: Battle HUD appears, then "It's not very effective..." appears
AC: See 92
AD: Softlock
AE: Nonfunctional
AF: 3TRAINERPOKe (that always turns into a Rhydon, not due to the Rhydon trap) was caught!
B0: Text scramble, then crash
B1 - B5: Softlock
B6: Pops all text boxes
B7 - FF: Softlock/Nonfunctional