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It was an inexpensive modem (modulator-demodulator) to connect a terminal or home computer via RS-232 into the phone line. Later ones came as an adapter card inside the home computer, eliminating the RS-232 link. One major advantage of Hayes modems over others of the time was the escape sequence "+++" and the easy to use Hayes "AT" command set, allowing complete control of the modem and connection through the same link as used for normal data, eliminating physical controls and switches on the modem. This was so popular it was soon copied by other modem makers, becoming a de-facto standard.

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13y ago

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