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 ...
Simple question, yet oddly hard to google: Do they add any latency? Would performance be better than a DVI-D to VGA adapter? I know they have to have a DAC because DP doesn't natively output analogue.
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