deckle = D = deep hack mode

DED /D-E-D/ n.

Dark-Emitting Diode (that is, a burned-out LED). Compare SED, LER, write-only memory. In the early 1970s both Signetics and Texas instruments released DED spec sheets as AFJs (suggested uses included "as a power-off indicator").

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.

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