defocus-dash mode

defocus-dash mode

[dē¦fō·kəs ¦dash ‚mōd]
(electronics)
A mode of cathode-ray tube storage of binary digits in which the writing beam is initially defocused so as to excite a small circular area on the screen; for one kind of binary digit it remains defocused, and for the other kind it is suddenly focused to a concentric dot and drawn out into a dash.
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