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    What is a parallel interface?


    Referred to as the parallel port, which is the LPT interface, it is an extended interface using the parallel communication protocol.The data transmission rate of the parallel port is 8 times faster than the serial port, and the data transmission rate of the standard parallel port is 1 Mbps, which is generally used to connect printers, scanners, and the like.Therefore, the parallel port is also called the print port.When using serial parallel ports, in principle every peripheral must be plugged into an interface. If all interfaces are used, the interface can only be added by adding a card.Strings and parallel ports are not only limited in speed, but also inconvenient to use, such as not supporting hot swapping.The parallel port uses a 25-pin dual-row socket. In addition to the most common application for printers, it can also be used to connect scanners, ZIP drives, and even external network cards, tape drives, and some extended hard drives.

    Let’s take a look at the development of the parallel port.History: The original parallel port design was to transfer data in one direction.Later, IBM developed a two-way parallel port technology called SPP (Standard ParallelPort), which can realize simultaneous input and output of data.Allows transmission of larger capacity data (500-1000 bytes/s), mainly for non-printer devices that require higher data transfer speeds, such as storage devices; followed by the launch of EPP, in 1992, Microsoft and HP jointly launchedA new parallel port standard called ECP (ExtendedCapabilitiesPort,), which is different from EPP.At present, the parallel port we use supports both EPP and ECP standards, and we can set the working mode of the parallel port in CMOS.


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