BLT

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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