Bitfields for Card Services Request Window access-speed:
Bit(s)	Description	)
 6-3	mantissa
	0000 use device speed code
	0001  1.0
	0010  1.2
	0011  1.2 ???
	0100  1.5
	0101  2.0
	0110  2.5
	0111  3.0
	1000  3.5
	1001  4.0
	1010  4.5
	1011  5.0
	1100  5.5
	1101  6.0
	1110  7.0
	1111  8.0
--- if mantissa==0 ---
 2-0	device speed code
	000 reserved
	001 250 ns
	010 200 ns
	011 150 ns
	100 100 ns
	101-111 reserved
--- if mantissa<>0 ---
 2-0	speed exponent
	000	1 ns
	001    10 ns
	010   100 ns
	011	1 us
	100    10 us
	101   100 us
	110	1 ms
	111    10 ms
SeeAlso: #00720,#00721