Error codes
 Error codes for R_PCXInfo() en R_ShowPCX()
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 List of error codes as returned by the functions R_PCXInfo () en R_ShowPCX ().

 These codes, constants and descriptions are defined in the header file
 RPCXLib.CH.

        CODES FOR R_PCXINFO() & R_SHOWPCX()

        CODE    CONSTANT                DESCRIPTION

        0       PL_OKAY                 Function executed okay

        1       PL_INVALID_PARAMETER    Invalid parameter passed
        2       PL_OPEN_PCX             Error opening PCX-file
        3       PL_READ_PCX             Error reading PCX-file
        4       PL_NO_PCXFILE           File is no valid PCX-file
        5       PL_INVALID_BPP          Invalid number of BPP
                                        Bits-Per-Pixel (should be 1 or 8)
        6       PL_INVALID_DIM          PCX-file has invalid dimensions
                                        ( > 640 x 480 )
        7       PL_UNKNOWN_SVGA         Unknown SuperVGA card

        CODES ONLY FOR R_SHOWPCX()

        8       PL_OPEN_DRIVER          Error opening RPCXLIB.GDR driver
        9       PL_READ_DRIVER          Error reading RPCXLIB.GDR driver
        10      PL_SVGA_NOTSUPPORTED    SuperVGA-card not supported (yet)
        11      PL_BUFFER_MEMORY        Enough memory for internal buffer