It is the indicators that movement in both directions, but one way at the same time. In microcomputer communications, HDX or half-duplex describes service of the internet local match that causes the device to deliver a duplicate of given information towards the sending computer’s display.
Some modems contain a switch that lets you select between half-duplex and full-duplex modes. The correct choice depends on which program you are using to transmit data through the modem. In half-duplex mode, each character transmitted is immediately displayed on your screen. An example of a half-duplex device is a CB (citizens band) radio.
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The hard disk was invented on September 13, 1956 by IBM team led by Rey Johnson (considered as “father” of the disk drive). Earlier hard disk drives were large and cumbersome devices.