INT 10 - Alloy MW386 - GET PHYSICAL WORKSTATION ADAPTER TYPE
        AH = 91h
Return: AL = video adapter type (see below)
Note:   types less than 80h do not imply that the current user is on the host
SeeAlso: AH=90h

Values for video adapter type:
 00h    monochrome
 01h    Hercules monochrome graphics
 02h    CGA
 03h    EGA
 04h    VGA
 80h    monochrome text terminal
 81h    Hercules graphics terminal
 82h    color graphics terminal

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