Replying to Avatar 5x3

Actually, I did. d-sub and rs-232 are still living in various realm of engineering because of their simplicity (work with 1/10 of hardware and code, even compared with USB 1.0). This type of interface sometimes still useful when you need reliability rather than speeds, such as measurement equipment and general control.
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Jeroen Ubbink 11mo ago

Yes rs-232 is still common and useful, but i doubt you can find mice that connect to it. I think it was actually invented as a standard debugging port.

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5x3 11mo ago

I agree with you. Come to think of it, I used DE-9(rs-232c) to connect an external modem to my PC to connect to the internet in 90's.