Node:blow up, Next:BLT, Previous:blow past, Up:= B =

blow up vi.

1. [scientific computation] To become unstable. Suggests that

the computation is diverging so rapidly that it will soon

overflow or at least go nonlinear. 2. Syn. blow out.

Node:BLT, Next:Blue Book, Previous:blow up, Up:=

B =

BLT /B-L-T/, /bl*t/ or (rarely) /belt/ n.,vt.

Synonym for blit. This is the

original form of blit and the ancestor

of bitblt. It referred to any large

bit-field copy or move operation (one resource-intensive

memory-shuffling operation done on pre-paged versions of ITS,

WAITS, and TOPS-10 was sardonically referred to as `The Big

BLT'). The jargon usage has outlasted the PDP-10 BLock Transfer instruction from which

BLT derives; nowadays, the assembler

mnemonic BLT almost always means

`Branch if Less Than zero'.

The Jargon File, Version 4.2.2, 20 Aug 2000 · 第 245 / 1941 题