Your friend is mistaken. This serial port he is talking about is called "CGA" and closely resembles a serial port. However it still requires a graphics card and a monitor! You can convert a CGA signal ...
I'm sure there is a spec somewhere (VESA or something) but here are a couple of references. Power is watts = volts * amps. Even though there was a +5V pin on a VGA connector, it may not be suitable ...
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