Shmoo plot

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In electrical engineering, a shmoo plot is a graphical display of the response of a component or system varying over a range of conditions or inputs. The origin of the shmoo plot is unclear. It is referenced in a 1966 IEEE paper. Another early reference is in manuals for IBM 2365 Processor Storage. The invention of the shmoo plot is sometimes credited to VLSI Hall Of Fame inductee Robert Huston (1941–2006). But this is unlikely because Huston did not begin working as a test engineer until 1967. The plot takes its name from the Shmoo, a fictional species created by Al Capp in the cartoon Li'l Abner. These small, blob-like creatures have shapes similar to the "working" volumes that would be enclosed by shmoo plots drawn against three independent variables (such as voltage, temperature, and response speed). Semiconductor chips do not usually exhibit "shmoo" shape plots. Historically, testing of magnetic core memory arrays produced the "shmoo" shape and the term continued into the semiconductor era.