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55 lines
2.3 KiB
Markdown
55 lines
2.3 KiB
Markdown
# FAQ
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## Questions
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- [What is pokecrystal11.gbc?](#what-is-pokecrystal11gbc)
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- [Can't build ROM; "ERROR: `UNION` already defined"](#cant-build-rom-error-union-already-defined)
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- [Can't build ROM; "Segmentation fault" from `rgbgfx`](#cant-build-rom-segmentation-fault-from-rgbgfx)
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- [Can't build ROM; "Section is too big" or "Unable to place section in bank"](#cant-build-rom-section-is-too-big-or-unable-to-place-section-in-bank)
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- [How do I edit maps?](#how-do-i-edit-maps)
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- [How do I write new features?](#how-do-i-write-new-features)
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- [I need more help!](#i-need-more-help)
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## What is pokecrystal11.gbc?
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Version 1.1 of Pokémon Crystal, which fixed some issues with the initial international release. `make crystal11` defines `CRYSTAL11` so the assembly builds the changed version.
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## Can't build ROM; "ERROR: `UNION` already defined"
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Download [**rgbds 0.3.3**][rgbds]. Earlier versions will not work.
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## Can't build ROM; "Segmentation fault" from `rgbgfx`
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If you are using 64-bit Windows, download [**64-bit Cygwin**][cygwin] and [**64-bit rgbds**][rgbds].
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## Can't build ROM; "Section is too big" or "Unable to place section in bank"
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If you have not changed any of the asm, make sure you have the latest version of pokecrystal and the correct version of rgbds (see [INSTALL.md](INSTALL.md)).
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If you added or changed any code, it has to fit in the **memory banks**. The 2MB ROM is divided into 128 banks of 4KB each, numbered $00 to $7F. The linkerscript **pokecrystal.link** lists which **`SECTION`**s go in which banks. Try moving some code into a new section.
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## How do I edit maps?
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For `asm` scripts, read [docs/map_scripts.md](docs/map_scripts.md). For `blk` layouts, try [crowdmap][crowdmap] or [Polished Map][polished-map].
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## How do I write new features?
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There are a number of special-purpose scripting languages used for different purposes, as described in [docs](docs/). For more general features, you'll need to code directly in assembly language. See [docs/assembly_programming.md](docs/assembly_programming.md).
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## I need more help!
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Try asking on IRC or Discord (see [README.md](README.md)).
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[cygwin]: https://cygwin.com/install.html
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[rgbds]: https://github.com/rednex/rgbds/releases
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[crowdmap]: https://github.com/yenatch/crowdmap/
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[polished-map]: https://github.com/roukaour/polished-map
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