INT 62 u - FGDRIVER v1.10 - "FG_MAKEPCX" - CREATE PCX FILE FROM SCREEN WINDOW
        AX = 0061h
        BX = left edge in screen space units
        CX = right edge in screen space units
        DX = top edge in screen space units
        SI = bottom edge in screen space units
        ES:DI -> ASCIZ filename of PCX file to create
Return: AX = status
            0000h successful
            0001h file not created
Notes:  the PCX file is created from the specified region of the active video
          page; the left and right edges are adjusted to a byte boundary if
          necessary
        if the specified file already exists, it is overwritten
        this call is ignored in text and Hercules low-resolution graphics modes