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April 1, 1983 · TAP

TAP No. 84 - Rate Steps as Forbidden Knowledge

TAP No. 84 - Rate Steps as Forbidden Knowledge

Cheshire Catalyst shares Bell System ‘rate step’ tables, obscure mileage brackets phone companies used to price long-distance calls, discovered in a Vermont directory, and provides a short BASIC program that calculates airline mileage between cities from their internal grid coordinates for curious readers to experiment with. A companion piece by Fred Steinbeck follows up on issue 63’s touch-tone modification article, noting that Pacific Telephone-era phones already ship with chips supporting the extra fourth column of DTMF tones and walking through opening the handset to access the module.

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