parity errors: pl.n. Little lapses of attention or (in more
severe cases) consciousness, usually brought on by having spent all
night and most of the next day hacking. "I need to go home and
crash; I'm starting to get a lot of parity errors." Derives from a
relatively common but nearly always correctable transient error in
memory hardware. It predates RAM; in fact, this term is reported to
have already have been in use in its jargoin sense back in the 1960s
when magnetic cores ruled. Parity errors can also afflict mass
storage and serial communication lines; this is more serious because
not always correctable.