Function 0F3h   Microsoft Mouse driver EGA support - Write Register Range 

entry   AH      0F3h 

	CH      starting register 

	CL      number of registers (1) 

	DX      group index 

		00h     CRTC (3B4h mono modes, 3D4h color modes) 

		08h     sequencer 3C4h 

		10h     graphics controller 3CEh 

		18h     attribute controller 3C0h 

	ES:BX   pointer to buffer, CL bytes