RBIL61 - INT 31 - DPMI 0.9+ - GET PAGE SIZE {protected mode}

INT 31 P - DPMIsee DOS Protected-Mode Interface 0.9+ - GET PAGE SIZE
	AX = 0604h
Return: CF clear if successful
	    BX:CX = page size in bytes
	CF set on error
	    AX = error code (DPMIsee DOS Protected-Mode Interface 1.0+) (see also #03143)
		8001h unsupported, 16-bit host
BUG:	the Borland C++ 3.1 DPMILOAD returns with CF clear but BX and CX
	  unchanged