/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'.