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1012--BLF1

Category: video 

INT 10 - Tseng ET-4000 BIOS - GET/SET SCREEN REFRESH RATE

	AH = 12h
	BL = F1h
	AL = subfunction
	    00h set refresh rate
	    01h get refresh rate
	BH = video mode
	    00h	 640x480
	    01h	 800x600
	    02h	 1024x768
	    03h	 1280x1024
	CX = new refresh rate (see #00035) if AL = 00h
Return: AL = 12h if supported
	    CX = current rate (for AL=00h, a changed CX indicates failure)

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