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1 definition found From The Jargon File (version 4.4.7, 29 Dec 2003) [jargon]: software rot n. Term used to describe the tendency of software that has not been used in a while to lose; such failure may be semi-humorously ascribed to bit rot. More commonly, software rot strikes when a program's assumptions become out of date. If the design was insufficiently robust, this may cause it to fail in mysterious ways. Syn. code rot. See also link rot. For example, owing to endemic shortsightedness in the design of COBOL programs, a good number of them succumbed to software rot when their 2-digit year counters underwent wrap around at the beginning of the year 2000. Actually, related lossages often afflict centenarians who have to deal with computer software designed by unimaginative clods. One such incident became the focus of a minor public flap in 1990, when a gentleman born in 1889 applied for a driver's license renewal in Raleigh, North Carolina. The new system refused to issue the card, probably because with 2-digit years the ages 101 and 1 cannot be distinguished. Historical note: Software rot in an even funnier sense than the mythical one was a real problem on early research computers (e.g., the R1; see { grind crank}). If a program that depended on a peculiar instruction hadn't been run in quite a while, the user might discover that the opcodes no longer did the same things they once did. (?Hey, so-and-so needs an instruction to do such-and-such. We can snarf this opcode, right? No one uses it.?) Another classic example of this sprang from the time an MIT hacker found a simple way to double the speed of the unconditional jump instruction on a PDP-6, so he patched the hardware. Unfortunately, this broke some fragile timing software in a music-playing program, throwing its output out of tune. This was fixed by adding a defensive initialization routine to compare the speed of a timing loop with the real-time clock; in other words, it figured out how fast the PDP-6 was that day, and corrected appropriately. Compare bit rot.