Expects: AX    4f00H
ES:DI Addr of buffer to receive an SvgaInfoRec
Returns: AX    VESA status: AH = 0 means successful (else failed)
AL = 4fH means function is supported
ES:DI buffer contains returned data (if successful)
Info: This function is used to see if VESA support is present and to
learn which extended video modes it supports.

The buffer at ES:DI must be at least 256 bytes long; see
SvgaInfoRec for a layout of the returned information.  This VESA
BIOS may place the list of supported modes into your buffer,
anywhere after offset 12H.

See Also: SVGA
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INT 10H 4f00H - Query SuperVGA Support