INT 33 - MS MOUSE v3.0+ - DEFINE TEXT CURSOR                                    
	AX = 000Ah
	BX = hardware/software text cursor
	    0000h software
		CX = screen mask
		DX = cursor mask
	    0001h hardware
		CX = start scan line
		DX = end scan line
Note:	when the software cursor is selected, the character/attribute data at
	  the current screen position is ANDed with the screen mask and then
	  XORed with the cursor mask
SeeAlso: AX=0009h,INT 62/AX=007Eh