The Meme Box

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I mean.

Most of those are serial. :-)
yeah, USB (Universal Serial Bus); PS/2 the name is acronym for IBM Personal System/2 but is a bidirectional synchronous serial connection and the DE9 (vulgarized as DB9) port is the small version of the connector for the IBM PC Serial implementation of RS-232 (Recommended Standard - 232) serial communications.

Even the XT/AT keyboard connections uses a type of Serial communication, because it uses a only line for data, the other lines are Clock, +V and GND. Similar to PS/2 so you can connect a AT keyboard to PS/2 port using a wire adapter, XT may no work because different CLK Signals.

So, All indeed are serial ports.
 

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