Generation I item codes: Difference between revisions

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Line 3: For a list of hex values for all Generation I Items and their corresponding assembly instructions, see [[the Big HEX List]]. ~~The~~Most of the following example setups are for the glitch item [[ItemDex/RB:093\|8F]]. The most popular bootstrap strategies for 8F jumps to the '''third item in the item pack''' ($D322 in English R/B, $D321 in English Yellow), leaving the first two item slots for 8F itself and possibly any item (that is not part of the code) to be manipulated. Most setups work for all other methods of ACE, such as [[ItemDex/RB:106\|-gm]] or [[Arbitrary code execution#Via text boxes\|text box ACE]], as long as they jump to the third item in the item pack during bootstrap. Some of the item codes further assume that the jump is made by a "jp hl" instruction, which means that hl also contains the address of the third item. That means those item codes will not work with the "super-compressed" setups that jump to the code with "jp $xxyy" (or any other jump instruction), unless further steps are taken to set hl to the desired value. See [~~http~~https://forums.glitchcity.info/index.php?topic=6638.0 the forum topic on 8F] for more examples of item codes. Item codes can also be generated from assembly code with the help of tools like [[GBz80 to Items]], or by manually referring to [[the Big HEX List]]. == Fix -gm bootstrap == Due to limitations on space and the available character set, the [[ItemDex/RB:106#Initial luckytyphlosion bootstrap\|initial bootstrap strategy for -gm]] designed by luckytyphlosion jumps to the ''second'' item in the item pack, which might make it inconvenient to make use of existing item codes and/or manipulate items. The below item code<ref name="lucky_guide">[https://pastebin.com/iGyyJstG Rough -gm guide (v0.1)] by luckytyphlosion</ref> is designed to fix this by modifying the initial bootstrap, inserting two "inc hl" instructions before "jp hl": -gm Thunderstone x1 TM17 x2 X Accuracy x79 Protein x2 Antidote x62 HP Up x2 Water Stone x2 Burn Heal x34 Parlyz Heal x62 TM33 x2 X Speed x34 TM01 x[any qty] After setting up the item list and using -gm once, the jump target of -gm will be changed to the third item in the item pack. The code is designed to be spelled with distinct items that are easy to buy in the Celadon Department Store. As a result, there are a lot of dummy instructions that can be adjusted according to the player's situation. <b>ld hl, $D901</b> ld [bc], a <b>ld l, $4F</b> <b>inc h</b> ; hl = $DA4F ld [bc], a dec bc <b>ld a, $23</b> ; opcode for "inc hl" ld [bc], a <b>ld [hli], a</b> ld [bc], a inc c <b>ld [hli], a</b> rrca <b>ld a, $E9</b> ; opcode for "jp hl" ld [bc], a ld b,e <b>ld [hli], a</b> <b>ret</b> ==Non-key item duplication== Line 46 ⟶ 84: Any item x Any qty X Accuracy x(b2) ~~Carbon~~Carbos x(b3) Max Revive x(b1) Poké Ball x201 Line 57 ⟶ 95: X Accuracy x56 ~~Carbon~~Carbos x205 Max Revive x1 Poké Ball x201 ==Get any Pokémon== The easiest way to get any Pokémon is to use the above "Gameshark-like code" to write the internal ID (see [[the Big HEX List]]) to $D059 (Red/Blue) or $D058 (Yellow). This triggers an encounter with the Pokémon, which can then be caught by a Master Ball (easily obtainable using the previous codes). An alternative way is to directly give the Pokémon to the player (like how Eevee is legitimately obtained in the game). The advantage is that some glitch Pokémon that cannot be encountered using the "instant encounter" method (ID = 0 or >= 200) can still be acquired this way. 8F Any item x Any qty Repel x[SpeciesIndex] X Speed x14 Ultra Ball x64 TM05 x72 (Red/Blue) OR TM05 x89 (Yellow) Lemonade x201 Note: Pokémon obtained this way are registered in the Pokédex, so getting [[MissingNo.]] this way will duplicate the 6th item. It would be necessary to toss TM05 x128 before using the code again. ==Enter Hall of Fame== A code to enter the Hall of Fame [https://archives.glitchcity.info/forums/board-115/thread-6638/page-4.html by Stackout]. 8F (any item) x (any) Awakening x 22 Carbos x100 X Accuracy x187 X Attack x 64 TM05 x214 Revive x201 ld c,$16 ld h,$64 ld l,$bb ld b,c ld b,b call $35d6 ret <pre>0e 16 26 64 2e bb 41 40 cd d6 35 c9</pre> == References == <references /> [[Category:Arbitrary code execution]]