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The Bell 101 dataset or Bell 101 modem was the first commercial modem for computers, released by AT&T Corporation in 1958 for use by SAGE and in 1959 made commercial shortly after AT&T's Bell Labs announced their 110 baud modulation frequencies. The Bell 101 modem allowed digital data to be transmitted over regular unconditioned telephone lines at a speed of 110 bits per second.
The Bell 101 modems were the first commercial equipment to use ASCII, which was called "four row", as opposed to the Baudot "three row" 6-bit/character code which was predominant from 1908–1962, prior to the rise of EBCDIC.