Bitfields for AMD-645 ISA Test Mode register:
Bit(s)	Description	)
 7-6	reserved (0)
 5	enable fast reset via PORT 0092h
 4	reserved (0)
 3	double DMA clock (=0 DMA at 1/2 ISA clock, =1 DMA at full ISA clock)
 2-0	reserved (0)
SeeAlso: #01011,#01012,#01014