(FLI) /FLY/ A joke
assembly language instruction first documented in the late 1970s in
"The Hackers Dictionary".
The FLI instruction was frequently referred to by engineers
when minicomputers such as the DEC PDP-8,
PDP-11 and
some early microcomputers such as the
IMSAI and
Altair
had dozens of front panel lights.
"When the computer is about to do some long I/O operation,
stick in a FLI so the accountants won't think the machine has
hung again."