Plaid screen
[XEROX PARC] A "special effect" that occurs when certain kinds of
memory smashes overwrite the control blocks or image memory of a bit-mapped display.
The term "salt and pepper" may refer to a different pattern of similar origin.
Though the term as coined at PARC refers to the result of an error, some of the
X demos induce plaid-screen effects deliberately as a
display hack.
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Jargon File]