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DMA Control
From SnesLab
DCNT is 8 bits wide, located at 2230h on the SA-1. It is initialized to zero.
DPrio is bit 6.
CDEN is bit 5.
CDSEL is bit 4.
DD stands for "destination device" and is bit 2.
Reference
- 4.1.27 on page 1-4-20 of Book II of the official Super Nintendo development manual