= G =
green card n.
[after the "IBM System/360 Reference
Data" card] A summary of an assembly language, even if the color is
not green and not a card. Less frequently used now because of the
decrease in the use of assembly language. "I'll go get my green
card so I can check the addressing mode for that instruction."
The original green card became a yellow card when the System/370
was introduced, and later a yellow booklet. An anecdote from IBM
refers to a scene that took place in a programmers' terminal room
at Yorktown in 1978. A luser overheard one of the programmers
ask another "Do you have a green card?" The other grunted and
passed the first a thick yellow booklet. At this point the luser
turned a delicate shade of olive and rapidly left the room, never
In fall 2000 it was reported from Electronic Data Systems that the
green card for 370 machines has been a blue-green booklet since 1989.
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.