overflow bit | = O = | overrun

overflow pdl n.

[MIT] The place where you put things when your PDL is full. If you don't have one and too many things get pushed, you forget something. The overflow pdl for a person's memory might be a memo pad. This usage inspired the following doggerel:

> Hey, diddle, diddle
> The overflow pdl
> To get a little more stack;
> If that's not enough
> Then you lose it all,
> And have to pop all the way back.
> -The Great Quux

The term `pdl' (see PDL) seems to be primarily an MITism; outside MIT this term is replaced by `overflow stack' (but that wouldn't rhyme with `diddle').

overflow bit | = O = | overrun