It wasn’t much better back in the days of RS-232 level signaling, either. While the pinouts were consistent ... you might need a DB-25 to DE-9 adaptor, and the really unlucky might need one ...
USB-to-serial adapters are available for old peripherals. DB (D-Sub) Connectors and COM Ports A serial port on a PC is a male 9-pin connector (DE-9 D-sub). Early PCs had two 9-pin connectors or ...
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