)
Values interrupt routine is called with:
	AX = condition mask (same bit assignments as call mask)
	BX = button state
	CX = cursor column
	DX = cursor row
	SI = horizontal mickey count
	DI = vertical mickey count
Notes:	some versions of the Microsoft documentation erroneously swap the
	  meanings of SI and DI
	in text modes, the row and column will be reported as a multiple of
	  the character cell size, typically 8x8 pixels