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Lior Halphon 2021-04-12 22:48:05 +03:00
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BESS.md
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@ -73,7 +73,7 @@ For example; `'GD '` represents a DMG of an unspecified revision, `'S '` repr
The values of memory-mapped registers should be written 'as-is' to memory as if the actual ROM wrote them, with the following exceptions and note:
* Unused registers have Don't-Care values which should be ignored
* Unused register bits have Don't-Care values which should be ignored
* The value of KEY0 (FF4C) must be valid as it determines DMG mode when the model is CGB or newer
* If the model is CGB or newer, the value of KEY0 (FF4C) must be valid as it determines DMG mode
* Sprite priority is derived from KEY0 (FF4C) instead of OPRI (FF6C) because OPRI can be modified after booting, but only the value of OPRI during boot ROM execution takes effect
* If a register doesn't exist on the emulated model (For example, KEY0 (FF4C) on a DMG), its value should be ignored.
* BANK (FF50) should be 0 if the boot ROM is still mapped, and 1 otherwise, and must be valid.