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.