[Bug 15688] New: DOS games (e.g. Colonel's Bequest) need vga Color plane write enable register

http://bugs.winehq.org/show_bug.cgi?id=15688

Summary: DOS games (e.g. Colonel's Bequest) need vga Color plane
                    write enable register
           Product: Wine
           Version: 1.1.6
          Platform: Other
               URL: http://www.abandonia.com/en/games/218/Laura+Bow+1+-
                    +The+Colonels+Bequest.html
        OS/Version: other
            Status: NEW
          Keywords: download
          Severity: normal
          Priority: P2
         Component: dos
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Several DOS games, e.g. Colonel's Bequest, complain and display nothing
because Wine does not yet support register 0x3c4 index 2:

fixme:ddraw:VGA_ioport_out Unsupported index, register 0x3c4: 0x02 (value 0x01)
fixme:ddraw:VGA_ioport_out Unsupported index, register 0x3c4: 0x02 (value 0x02)
fixme:ddraw:VGA_ioport_out Unsupported index, register 0x3c4: 0x02 (value 0x04)
fixme:ddraw:VGA_ioport_out Unsupported index, register 0x3c4: 0x02 (value 0x08)

http://www.qzx.com/pc-gpe/vgaregs.txt documents this register/index as follows:

Port-Index: 02h              Port: 03c4h
usage:      Color plane write enable register
            d7,d6 Reserved
            d3    Plane 3 Write enable
            d2    Plane 2 Write enable
            d1    Plane 1 Write enable
            d0    Plane 0 Write enable