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n. 1. Archaic term for a register. On-line use of it as a synonym for `register' is a fairly reliable indication that the...
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View Definition: 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 jargon-1 co-authors, had JFCL on the license plate of his BMW for years. Usage rare except among old-time PDP-10 hackers.