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).
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