2018-12-17 16:01:23 +11:00
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# Game Pak ROM / Flash ROM (ROM)
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* **Address Span (Wait State 0):** `0x800_0000` to `0x9FF_FFFF`
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* **Address Span (Wait State 1):** `0xA00_0000` to `0xBFF_FFFF`
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* **Address Span (Wait State 2):** `0xC00_0000` to `0xDFF_FFFF`
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The game's ROM data is a single set of data that's up to 32 megabytes in size.
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However, that data is mirrored to three different locations in the address
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space. Depending on which part of the address space you use, it can affect the
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memory timings involved.
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TODO: describe `WAITCNT` here, we won't get a better chance at it.
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TODO: discuss THUMB vs ARM code and why THUMB is so much faster (because ROM is a 16-bit bus)
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