INT 10 - VIDEO - LOCATE 3270PC CONFIGURATION TABLE (INSTALLATION CHECK)
        AX = 3000h
        CX = 0000h
        DX = 0000h
Return: CX:DX -> 3270PC configuration table (see below)
        CX:DX = 0000h:0000h if 3270PC Control Program not active

Format of 3270 PC configuration table:
Offset  Size    Description
 00h    BYTE    aspect ratio X
 01h    BYTE    aspect ratio Y
 02h    BYTE    monitor type
                00h = 5151 (mono) or 5272 (color)
                01h = 3295
                02h = 5151 or 5272 with XGA (???) graphics adapter
                03h = 5279 with 3270PC G adapter
                04h = 5379 model C01 with 3270PC GX adapter
                05h = 5379 model M01 with 3270PC GX adapter
                07h = non-3270PC with 3270 Workstation Program
                FFh = 3270PC Control Program not loaded
 03h    BYTE    reserved
 04h    BYTE    adapter ID
                00h = 5151/5272 adapter
                04h = 5151/5272 with XGA adapter
                30h = 3295 or 3270PC G/GX adapter
 05h    BYTE    reserved
 06h    BYTE    function flags 1
                bit 7: mono text, 1 page
                    6: color text, 1 page
                    5: color text, 4 pages
                    4: CGA color graphics
                    3: 720x350 two-color graphics
                    2: 360x350 four-color graphics
                    1: 720x350 eight-color graphics
 07h    BYTE    function flags 2
                bit 6: GPI graphics supported
 08h    WORD    segment address of Control Program Level table (see below)
 0Ah 10 BYTEs   reserved

Format of Control Program Level table:
Offset  Size    Description
 00h    WORD    program version
                02xxh = 3270PC Control Program v2.xx
                03xxh = 3270PC Control Program v3.xx
                04xxh = 3270 Workstation Program v1.xx
 02h    BYTE    Control Program ID (00h)
 03h 27 BYTEs   Control Program Descriptor ("IBM 3270 PC CONTROL PROGRAM")