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March 1, 1978 · TAP

TAP No. 49 - More Fortress Fun, TWX Phreaking, Marisat Codes

TAP No. 49 - More Fortress Fun, TWX Phreaking, Marisat Codes

Two collaborators nicknamed ‘CJ’ and ‘The Professor’ dissect a decommissioned ‘Fortress’ payphone, correcting and refining mechanical details from an earlier issue’s coin-box article and explaining how the coin-relay mechanism actually generates its tone pulses. Also warns that Red Box tone timing drifts with outdoor temperature and walks through a series of coin-drop ‘click’ experiments readers could perform on live payphones to understand the mechanism, without needing to remove anything.

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