INT 33 - PCMOUSE - SAVE MSMOUSE STATE

	AX = 0050h
	BX = buffer size (ignored by some driver versions)
	ES:DX -> buffer
Return: AX = FFFFh if successful
Notes:	the buffer must be large enough to hold the entire state, or following
	  data will be overwritten by state data in versions which ignore BX;
	  use INT 33/AX=0042h to get the required size
	this function is also supported by the Genius Mouse 9.06 driver
SeeAlso: AX=0042h,AX=0052h