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'.
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