7/26/2023 0 Comments Serial port pinout computer db9The 10-pin variant provided for both EIA RS-232 and RS-422 ( differential pairs) (20mA was obsolescent by the time the cards which used this came out). The 40-pin variant usually provided both EIA RS-232 and 20mA electrical interfaces (on different pins EIA- and 20mA-specific cables connected to the appropriate pins). Thus, all the interfaces of a given header type all took standard interface cables. 100" header (now often called DuPont or IDC connectors), and later, a 10 pin IDC header both with a standard pin-out across all instances. DEC asynchronous serial line interface boards which supported one, or a small number of, lines all tended to use one of two physical interfaces: a 40 pin Berg connector.
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