These are the serial port and VGA port. The serial port is 16550A compatible. The external VGA port supports resolutions of 640x480 with 16 million colors to 1024x768 with 256 colors. The VGA port also supports simultaneous LCD/external monitor. The resolution and refresh rates are:

640x48060hz, 72hz, 75hz
800x60056hz, 60hz, 72hz, 75hz
1024x76860hz, 70hz, 72hz, 75hz, 87ihz
1280x102487ihz