INT 31 P - CauseWay v1.3 - "GetSels" - ALLOCATE MULTIPLE SELECTORS
	AX = FF29h
	CX = number of selectors to allocate
Return: BX = base selector
Desc:	allocate multiple contiguous selectors, initializing each to have a
	  base address and limit of zero
SeeAlso: AX=FF00h,AX=FF04h