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INC/DEC Flag

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The INC/DEC Flag is bit 4 of DMAPx (43x0h). It is operable when a GP-DMA is happening and the Fixed Address Flag is clear.

When clear, the A-Bus addressing serving as the DMA source/target is being automatically incremented. When set, the A-Bus address serving as the DMA source/target is being automatically decremented.

Reference

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