Bitfields for HP EX-BIOS driver class:
Bit(s)	Description	)
 15	maps F1 to F8 softkeys
 14	keyboard
 13	cursor pad
 12	console device
 11	serial output device (may be capable of limited input)
 10	"CL_COMM" reserved
 9	interfaces multiple resources transparent to operating system
 8	serial output device filter (can be mapped between logical and physical
	  driver to perform translations)
 7	addressed block device
 6	priority boot device
 5	logical graphics input device
 4	physical graphics input device (can map to child of another driver)
 3	"CL_GID" can map to an event
 2	physical touch device
 1	reserved
 0	class extension bit
Note:	special values: FFFFh maps to all other devices (V_PNULL), and 0000h
	  maps to no other driver
SeeAlso: #03745