Bitfields for PicoPower Vesuvius V3-LS distributed DMA control register:
Bit(s)	Description	)
 15-6	reserved
 5	(revision BB & later) secondary slave floppy disk distributed access
	  enable (if bit 1 = 0)
 4	(revision BB & later) secondary slave hard disk distributed access
	  enable (if bit 1 = 0)
 3	slave floppy drive port distributed access enable (if bit 1 = 0)
 2	slave hard drive port distributed access enable (if bit 1 = 0)
 1	distributed DMA mode
	0 = master
	1 = slave
 0	distributed DMA function enable
SeeAlso: #00971