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BLT BLT n 1: sandwich filled with slices of bacon and tomato with lettuce [synonym: {bacon-lettuce-tomato sandwich}, {BLT}] 1. /B-L-T/, /bl*t/ or (rarely) /belt/ Synonym for {blit}.
This is the original form of {blit} and the ancestor of {bitblt}. It refers 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 {assembly language} {mnemonic} {BLT} almost always means "Branch if Less Than zero". 2. bacon, lettuce and tomato (sandwich). [{Jargon File}] BLock Transfer BLT: /B·L·T/, /bl@t/, /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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