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Meta-map script activation: Difference between revisions
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{{Bulbapedia2|0 ERROR}}
'''Meta-map script activation''' refers to a set of [[glitch]]es in {{RBY}}. These glitches will modify the "meta-map script" (also known as GameProgressFlags in the Pokémon disassembly projects<ref>[https://github.com/pret/pokered/blob/master/ram/wram.asm Pokémon Red disassembly project WRAM]</ref><ref>[https://github.com/pret/pokeyellow/blob/master/ram/wram.asm Pokémon Yellow disassembly project WRAM]</ref>) associated with a certain map, which is a special map script used to execute code on particular maps (one byte for each map). An example of a meta-map script is one that sets the event in Pallet Town where Professor Oak stops the player from walking into the grass. It is disabled later thanks to the game changing the ID of the meta-map script later.
Several variations of the [[Trainer escape glitch]] can modify the meta-map script in unintended ways on the location that the player escaped from the Trainer.
One of the most characteristic effects of meta-map script activation is the '''[[#"Walking_lag" effect|walking lag effect]]''', also known as '''0 ERROR''', or '''Zero Error''' (due to an error code that appears in a text box when the player brings up the start menu). Apart from making the player wait a long time between steps (hence the name "walking lag") and the error code, glitchy sound effects and game freezes may also happen, depending on the player's coordinates and time spent on the map.
<!-- If the player loses, a text box may appear before the player is sent back to their black out location. --> <!-- Without context it's hard to understand what this is trying to say. -->
Certain invalid meta-map scripts also allow for [[arbitrary code execution]].
==Activation==
The glitch can be pulled off by three variations of the [[Trainer escape glitch]].
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[[Image:Zeroerror9.png]]
=== Manually setting up a glitch script with stored PC items ===
Setting up the dry underflow glitch with stored PC items allows the player to manipulate certain meta-map scripts by modifying the item past item 50.
For example, item 100's quantity controls the map script for Route 8 (address D601 in Red/Blue, D600 in Yellow). Though a quantity of 1 for this item will set up a CD2D/Special-stat encounter (as if activating the Trainer escape glitch), out of bounds values are glitch scripts associated with this glitch. As in the usual Trainer escape glitch, bit 0 of $CD60 and $D730 must not be set for the CD2D/Special-stat encounter to appear. If the encounter doesn't occur even after preparing the Special stat/or CD2D, the player still has to reset them by changing boxes and resetting the game, and pushing a Strength boulder/having another Trainer walk up to the player [[Trainer escape glitch#Special stat encounter|etc.]]
This method is ideal for altering a meta-map script at ease, especially if it corresponds to an item quantity. The player may also be able to manipulate all 256 meta-map scripts for the map (but if the script corresponds with an item, manipulating a Cancel (0xFF) for script 255 might be harder). Furthermore, as there are only 256 item/quantity pairs in the expanded PC and the addresses after item 128 quantity are a mirror of items 1-128 again, it is usually only possible to corrupt up to D63A (W_MANSION1CURSCRIPT) in Red/Blue or D639 (both W_CINNABARISLANDCURSCRIPT and W_MANSION1CURSCRIPT) in Yellow this way.
The first meta-script address in both Red/Blue and Yellow is W_OAKSLABCURSCRIPT (Red/Blue, D5F0/ Yellow, D5EF) and is PC item 91's quantity. The last accessible ones W_MANSION1CURSCRIPT (Red/Blue, D63A) and W_CINNABARISLANDCURSCRIPT/W_MANSION1CURSCRIPT (Yellow, D639) are PC item 128's quantity.
=== Triggering mechanism with the Trainer escape glitch ===
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== Map 0xFE corruption ==
After the player enters [[map 0xFE (English Yellow)|Pokémon Yellow's map 0xFE]] without a freeze using a safe level-script pointer for DC0E, they will be warped to map 0x99 (a house in Fuchsia City).
After using the expanded items pack to escape this map (as the exit by default will link back to the house), the player will be able to access maps with invalid meta-map scripts.
The scripts written by map 0xFE corruption are always the same, as the corruption for D5EF+ is due to the game copying ROM data from 20:5193 onward into that portion of RAM (possibly in the middle of 20:4F14 SurfingPikachu1Graphics1).
{| class="wikitable"
! Address !! Label !! New script ID (HEX) !! Source of corruption
|-
| D5EF || W_OAKSLABCURSCRIPT || 0 || 20:5193
|-
| D5F0 || W_PALLETTOWNCURSCRIPT || 0 || 20:5194
|-
| D5F1 || || 0 || 20:5195
|-
| D5F2 || W_BLUESHOUSECURSCRIPT || 0 || 20:5196
|-
| D5F3 || W_VIRIDIANCITYCURSCRIPT || 0 || 20:5197
|-
| D5F4 || || 38 || 20:5198
|-
| D5F5 || || 38 || 20:5199
|-
| D5F6 || W_PEWTERCITYCURSCRIPT || 4 || 20:519A
|-
| D5F7 || W_ROUTE3CURSCRIPT || 4 || 20:519B
|-
| D5F8 || W_ROUTE4CURSCRIPT || 3C || 20:519C
|-
| D5F9 || || 3C || 20:519D
|-
| D5FA || W_VIRIDIANGYMCURSCRIPT || 44 || 20:519E
|-
| D5FB || W_PEWTERGYMCURSCRIPT || 44 || 20:519F
|-
| D5FC || W_CERULEANGYMCURSCRIPT || 3E || 20:51A0
|-
| D5FD || W_VERMILIONGYMCURSCRIPT || 3E || 20:51A1
|-
| D5FE || W_CELADONGYMCURSCRIPT || 0 || 20:51A2
|-
| D5FF || W_ROUTE6CURSCRIPT || 0 || 20:51A3
|-
| D600 || W_ROUTE8CURSCRIPT || 2 || 20:51A4
|-
| D601 || W_ROUTE24CURSCRIPT || 2 || 20:51A5
|-
| D602 || W_ROUTE25CURSCRIPT || 2 || 20:51A6
|-
| D603 || W_ROUTE9CURSCRIPT || 2 || 20:51A7
|-
| D604 || W_ROUTE10CURSCRIPT || 2 || 20:51A8
|-
| D605 || W_MTMOON1CURSCRIPT || 2 || 20:51A9
|-
| D606 || W_MTMOON3CURSCRIPT || 3E || 20:51AA
|-
| D607 || W_SSANNE8CURSCRIPT || 3E || 20:51AB
|-
| D608 || W_SSANNE9CURSCRIPT || 42 || 20:51AC
|-
| D609 || W_ROUTE22CURSCRIPT || 42 || 20:51AD
|-
| D60A || || 42 || 20:51AE
|-
| D60B || W_REDSHOUSE2CURSCRIPT || 42 || 20:51AF
|-
| D60C || W_VIRIDIANMARKETCURSCRIPT || 3E || 20:51B0
|-
| D60D || W_ROUTE22GATECURSCRIPT || 3E || 20:51B1
|-
| D60E || W_CERULEANCITYCURSCRIPT || 0 || 20:51B2
|-
| D60F || || 0 || 20:51B3
|-
| D610 || || 0 || 20:51B4
|-
| D611 || || 0 || 20:51B5
|-
| D612 || || 0 || 20:51B6
|-
| D613 || || 0 || 20:51B7
|-
| D614 || || 3C || 20:51B8
|-
| D615 || || 3C || 20:51B9
|-
| D616 || W_SSANNE5CURSCRIPT || 22 || 20:51BA
|-
| D617 || W_VIRIDIANFORESTCURSCRIPT || 22 || 20:51BB
|-
| D618 || W_MUSEUM1FCURSCRIPT || 22 || 20:51BC
|-
| D619 || W_ROUTE13CURSCRIPT || 22 || 20:51BD
|-
| D61A || W_ROUTE14CURSCRIPT || 22 || 20:51BE
|-
| D61B || W_ROUTE17CURSCRIPT || 22 || 20:51BF
|-
| D61C || W_ROUTE19CURSCRIPT || 22 || 20:51C0
|-
| D61D || W_ROUTE21CURSCRIPT || 22 || 20:51C1
|-
| D61E || W_SAFARIZONEENTRANCECURSCRIPT || 0 || 20:51C2
|-
| D61F || W_ROCKTUNNEL2CURSCRIPT || 0 || 20:51C3
|-
| D620 || W_ROCKTUNNEL1CURSCRIPT || FE || 20:51C4
|-
| D621 || || FE || 20:51C5
|-
| D622 || W_ROUTE11CURSCRIPT || 10 || 20:51C6
|-
| D623 || W_ROUTE12CURSCRIPT || 10 || 20:51C7
|-
| D624 || W_ROUTE15CURSCRIPT || 10 || 20:51C8
|-
| D625 || W_ROUTE16CURSCRIPT || 10 || 20:51C9
|-
| D626 || W_ROUTE18CURSCRIPT || 10 || 20:51CA
|-
| D627 || W_ROUTE20CURSCRIPT || 10 || 20:51CB
|-
| D628 || W_SSANNE10CURSCRIPT || 10 || 20:51CC
|-
| D629 || W_VERMILIONCITYCURSCRIPT || 10 || 20:51CD
|-
| D62A || W_POKEMONTOWER2CURSCRIPT || 10 || 20:51CE
|-
| D62B || W_POKEMONTOWER3CURSCRIPT || 10 || 20:51CF
|-
| D62C || W_POKEMONTOWER4CURSCRIPT || 10 || 20:51D0
|-
| D62D || W_POKEMONTOWER5CURSCRIPT || 10 || 20:51D1
|-
| D62E || W_POKEMONTOWER6CURSCRIPT || 0 || 20:51D2
|-
| D62F || W_POKEMONTOWER7CURSCRIPT || 0 || 20:51D3
|-
| D630 || W_ROCKETHIDEOUT1CURSCRIPT || 0 || 20:51D4
|-
| D631 || W_ROCKETHIDEOUT2CURSCRIPT || 0 || 20:51D5
|-
| D632 || W_ROCKETHIDEOUT3CURSCRIPT || 0 || 20:51D6
|-
| D633 || W_ROCKETHIDEOUT4CURSCRIPT || 0 || 20:51D7
|-
| D634 || || 3C || 20:51D8
|-
| D635 || W_ROUTE6GATECURSCRIPT || 3C || 20:51D9
|-
| D636 || W_ROUTE8GATECURSCRIPT || 42 || 20:51DA
|-
| D637 || || 42 || 20:51DB
|-
| D638 || || 42 || 20:51DC
|-
| D639 || W_CINNABARISLANDCURSCRIPT/W_MANSION1CURSCRIPT || 42 || 20:51DD
|-
| D63A || || 42 || 20:51DE
|-
| D63B || W_MANSION2CURSCRIPT || 42 || 20:51DF
|-
| D63C || W_MANSION3CURSCRIPT || 3C || 20:51E0
|-
| D63D || W_MANSION4CURSCRIPT || 3C || 20:51E1
|-
| D63E || W_VICTORYROAD2CURSCRIPT || 0 || 20:51E2
|-
| D63F || W_VICTORYROAD3CURSCRIPT || 0 || 20:51E3
|-
| D640 || || 10 || 20:51E4
|-
| D641 || W_FIGHTINGDOJOCURSCRIPT || 10 || 20:51E5
|-
| D642 || W_SILPHCO2CURSCRIPT || 10 || 20:51E6
|-
| D643 || W_SILPHCO3CURSCRIPT || 10 || 20:51E7
|-
| D644 || W_SILPHCO4CURSCRIPT || 10 || 20:51E8
|-
| D645 || W_SILPHCO5CURSCRIPT || 10 || 20:51E9
|-
| D646 || W_SILPHCO6CURSCRIPT || 10 || 20:51EA
|-
| D647 || W_SILPHCO7CURSCRIPT || 10 || 20:51EB
|-
| D648 || W_SILPHCO8CURSCRIPT || 10 || 20:51EC
|-
| D649 || W_SILPHCO9CURSCRIPT || 10 || 20:51ED
|-
| D64A || W_HALLOFFAMEROOMCURSCRIPT || 10 || 20:51EE
|-
| D64B || W_GARYCURSCRIPT || 10 || 20:51EF
|-
| D64C || W_LORELEICURSCRIPT || 10 || 20:51F0
|-
| D64D || W_BRUNOCURSCRIPT || 10 || 20:51F1
|-
| D64E || W_AGATHACURSCRIPT || 0 || 20:51F2
|-
| D64F || W_UNKNOWNDUNGEON3CURSCRIPT || 0 || 20:51F3
|-
| D650 || W_VICTORYROAD1CURSCRIPT || 0 || 20:51F4
|-
| D651 || || 0 || 20:51F5
|-
| D652 || W_LANCECURSCRIPT || 10 || 20:51F6
|-
| D653 || || 10 || 20:51F7
|-
| D654 || || 0 || 20:51F8
|-
| D655 || || 0 || 20:51F9
|-
| D656 || || 10 || 20:51FA
|-
| D657 || W_SILPHCO10CURSCRIPT || 10 || 20:51FB
|-
| D658 || W_SILPHCO11CURSCRIPT || 10 || 20:51FC
|-
| D659 || || 10 || 20:51FD
|-
| D65A || W_FUCHSIAGYMCURSCRIPT || 10 || 20:51FE
|-
| D65B || W_SAFFRONGYMCURSCRIPT || 10 || 20:51FF
|-
| D65C || || 10 || 20:5200
|-
| D65D || W_CINNABARGYMCURSCRIPT || 10 || 20:5201
|-
| D65E || W_CELADONGAMECORNERCURSCRIPT || 0 || 20:5202
|-
| D65F || W_ROUTE16GATECURSCRIPT || 0 || 20:5203
|-
| D660 || W_BILLSHOUSECURSCRIPT || 0 || 20:5204
|-
| D661 || W_ROUTE5GATECURSCRIPT || 0 || 20:5205
|-
| D662 || W_POWERPLANTCURSCRIPT/W_ROUTE7GATECURSCRIPT || 0 || 20:5206
|-
| D663 || || 0 || 20:5207
|-
| D664 || W_SSANNE2CURSCRIPT || 0 || 20:5208
|-
| D665 || W_SEAFOAMISLANDS4CURSCRIPT || 0 || 20:5209
|-
| D666 || W_ROUTE23CURSCRIPT || 0 || 20:520A
|-
| D667 || W_SEAFOAMISLANDS5CURSCRIPT || 0 || 20:520B
|-
| D668 || W_ROUTE18GATECURSCRIPT || 7E || 20:520C
|}
== Fixing the glitch ==
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==List of meta-map script addresses==
''See [[MetascriptDex]]. There are also some differences between the Red/Blue and Yellow layouts.''
== YouTube video ==
{{Youtube|f0tx96EkkrM|Crystal_}}
== References ==
<references/>
[[Category:Generation I glitches]]
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