NDMA

* old DMA appears to have priority over NDMA (makes sense, in a way, if you're going to be using old DMA for hblank and/or other timing-critical shito, and NDMA for the newfangled shit)

* NDMAxBCNT is for delay between physical blocks
* round-robin mode:
** a channel with NDMAxBCNT set to zero will keep running until it has completed a logical block.
** a channel with a delay (NDMAxBCNT nonzero) will run for one physical block.

observed timings with a channel that has NDMAxBCNT set to 1, physicalblock=1word, logicalblock=16words, roundrobin=7 (64c)

67 67 7 67 67 7 ...

which is weird.

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Kuribo64