Before USB ports became standard on PCs, several devices connected through a serial port. They're obsolete in many ways, but they still see some use.

A serial port on a PC is a male 9-pin connector (DE-9 D-sub). Early PCs had two 9-pin connectors or one 9-pin and one 25-pin (DB-25). On a PC, serial ports are called "COM ports," identified as ...

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Serial port – Known in the trade as RS-232C, the serial connection is the oldest “legacy” port on your computer (the industry’s term for ancient technology).

The back of your PC is a rich source of connectivity. Ports and connectors exist for just about any device you can find, though some may be more obscure than others. In today’s USB-centric PC ...

Mountain View, Calif—Board supplier Diamond Systems Corp. now offers its Emerald-MM-8P, a stackable PC/104 serial-port module. The Emerald-MM-8P gives you eight multi-protocol serial ports on the ...

Just like a PC’s USB port, the serial port on a PC can also in some cases serve as a power supply. A USB port can provide as much as 500 mA at 5V, but a serial port provides less power. Even with the ...

Like building an PC-operared telephone dialer for COM port, for example. I once saw such a circuit in a PC magazine from circa 1986 to 1988, it used an miniature relay in DIP form factor.

Serial-port header: ... USB 3.0 front panel: The DZ77GA motherboard ships with two front-panel USB 3.0 connectors, driving up to four USB 3.0 ports on the front of the PC case.

The simple method described here evaluates a one-wire device that uses pulse-width-encoded communications from a PC serial port. Communications errors such as parity and acknowledge are monitored ...

Targeting serial-intensive applications, the SIO-104+8.485 eight-port PC/104 RS-485 module conforms to PC/104 specifications and includes UARTs with 128-byte FIFOs for communication ...