Glitch City RAM manipulation (buffer overflow techniques): Difference between revisions
Glitch City RAM manipulation (buffer overflow techniques) (view source)
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Combining the data of a [[Glitch City]] sourced from RAM with a buffer overflow technique that depends on the contents of the screen (or a related screen buffer) allows the player to have more control over the desired corruption; because the [[RAM]] is not fixed and is writable during gameplay. (If a sequence of bytes is not present in the ROM the player can manipulate it into RAM instead)
For example, a form of Glitch City RAM manipulation is used during [[oobLG]]. In Yellow, this is with the help of [[ItemDex/Y:091|6F]] (a screen-saving glitch item), a Glitch City ([[Expanded bag item documentation (Generation I)|with manipulation of the top-left block pointer D35E/D36F to a RAM pointer]]) and an [[Unterminated name Pokémon (Generation I)|unterminated name Pokémon]]. For one method in Yellow, bag item 14's quantity (in RAM) becomes the Pokémon encounter. In the [[blockoobLG]] it is the quantity of item 23 that defines a block on the screen; based on the sub-tiles of the block, and the contents of y=0C, x=0A defines the Pokémon in the screen buffer.
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