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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'.