The first two-way parallel ports allowed for speeds of 2.4Mb/s. The parallel ports on personal computers can be used to send 8 bits (one octet) simultaneously via 8 wires: Parallel data transmission involves sending data simultaneously on several channels (wires). A serial port connector generally has 9 or 25 pins and resemble the following (DB9 and DB25 connectors respectively):Ī personal computer generally has between one and four serial ports. This is why the connectors behind the casing that are connected to the motherboard by a wire cable can be used to connect an exterior element. What is a serial port? Serial ports are generally built into the motherboard.
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