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Fixed Address Flag
From SnesLab
The Fixed Address Flag is bit 3 of DMAP (43x0h). It determines whether the A-Bus address used by a GP-DMA changes while the DMA is running.
When set, the A-Bus address is fixed. This is used when clearing VRAM, for example.
When clear, the A-Bus address is automatically incremented either decremented by hardware (depending on the state of the INC/DEC Flag).
Reference
- page 2-28-10 of Book I of the official Super Nintendo development manual