JFCL /jif'kl/, /jaf'kl/, /j*-fi'kl/ vt., obs. (alt.
`jfcl') To cancel or annul something. "Why don't you jfcl that
out?" The fastest do-nothing instruction on older models of the
PDP-10 happened to be JFCL, which stands for "Jump if Flag set and
then CLear the flag"; this does something useful, but is a very
fast no-operation if no flag is specified. Geoff Goodfellow, one
of the Steele-1983 co-authors, had JFCL on the license plate of his
BMW for years. Usage: rare except among old-time PDP-10 hackers.
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