@dhfir it's a DVI but DVI is tricky, it can be both digital and analog. DVI-D is easy convertable to HDMI, and DVI-A to VGA.

The second is coaxial antenna, I don't know what exactly it's for. Probably TV tuner?

The third is PS/2 for mouse and keyboard you may need it if BIOS checks if keyboard is connected. Long one is LPT for printers, and SPDIF for audio, you probably don't need them.