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PC-ism: /P-C-izm/ n. A piece of code or coding technique that
   takes advantage of the unprotected single-tasking environment in
   IBM PCs and the like, e.g., by busy-waiting on a hardware register,
   direct diddling of screen memory, or using hard timing loops.
   Compare ill-behaved, vaxism, unixism.  Also,
   `PC-ware' n., a program full of PC-isms on a machine with a more
   capable operating system.  Pejorative.