INT 67 - VIDEMS.SYS v1.31+ - RETURN PHYSICAL PAGE SIZE                          
	AX = 2763h
	CL = 05h
	BX = signature AAFFh
Return: AH = 00h
	DX = size in bytes
Desc:	Used by Conea products to determine if addressing mode has changed.
	  Normally, all VIDEMS versions beginning from 1.15 use 4K "physical"
	  pages.
Notes:	this function will probably become raw page size in future releases of
	  VIDEMS, which	will support the LIM 4.0 standard.
SeeAlso: AX=2763h/CL=01h,AX=2763h/CL=02h