INT 2F u - Quarterdeck RPCI - VIDRAM v5.0+ - INSTALLATION CHECK
        AX = D201h
        BX = 5649h ("VI")
        CX = 4452h ("DR")
        DX = 414dh ("AM")
Return: BX = 4F4Bh ("OK")
        ES:DI -> VIDRAM entry point
Note:   Quarterdeck programs (QEMM/QRAM/VIDRAM/MANIFEST/etc) will search for a
          free AH value from D2h through FFh, then C0h through D1h
SeeAlso: AX=D200h

Call VIDRAM entry point with:
        AH = 00h get status
                Return: AL = VIDRAM state (see below)
                        BL = extra RAM status
                            00h VIDRAM does not use extra RAM
                            01h VIDRAM uses EMS as extra RAM
                            02h VIDRAM uses EGA as extra RAM
                        BH = feature flags
                            bit 0: override enabled
                            bit 1: mapped memory detected in A000h-B000h range
                            bit 2: top of memory not at 640K
                            bit 3: MDA detected
                            bit 4: high RAM exists in video area
                            bit 5: mapped memory detected in video area
                            bits 6-7: reserved???
                        CL = current monitor (01h = mono, 80h = color)
                        SI = current top of memory (paragraph)
                        DI = segment of start of HiRAM chain
        AH = 01h setup
                AL = VIDRAM state (00h off, 01h no EGA graphics, 02h no graph)
                BL = extra RAM status (see above)
                BH = feature flags (see above)
                CL = monitor (01h = monochrome, 80h = color)
                SI = new top of memory (paragraph)
                DI = segment of start of HiRAM chain
        AH = 02h get end address of VIDRAM code
                Return: ES:DI -> VIDRAM partial map context (see below)
Return: CF set on error
        CF clear if successful

Format of partial map context (EMS 3.2):
Offset  Size    Description
 00h    BYTE    EMS version ID (32h)
 01h    WORD    EMM handle for this entry
 03h    BYTE    number of frames
 04h    BYTE    first page frame
 05h    WORD    offset from ES to previously saved map

Format of partial map context (EMS 4.0):
Offset  Size    Description
 00h    BYTE    EMS version ID (40h)
 01h    WORD    mappable segment count
 03h  N WORD    mappable segments
        WORD    offset to previously saved map???

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