INT 10 - VIDEO - Realtek RTVGA - RETURN CHIP VERSION

	AX = 5F00h
Return: AH = 00h, if successful
	AL = chip version (the same value that VTEST.EXE reads)
	    00h RTG3103???
	    01h RTG31030/RTG3105
	    02h RTG3106???
	    3Fh non-Realtek chip
BUG:	in v3.C10, AX=5F00h on return due to improper stack restoration code
SeeAlso: AX=5F01h"RTVGA"