Seth Morabito 177be95e5d 3b2: Refactor DUART and DMA ...

This change is a major refactor of how DMA and the DUART interact.

DMA implementation can now be overridden by individual devices that
require DMA. Disk and Floppy both continue to use a generic DMA
implementation, but the DUART code replaces the generic DMA with its
own implementation that correctly rate-limits TX. Among other things,
this allows the simulator to work correctly with real serial
terminals. This functionality has been tested on an AT&T 5620 "Blit"
terminal, which can run the 'layers' windowing software from the
simulator.

2018-04-11 14:24:48 -07:00

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