Block-transfer Instruction
On the PDP-10, the BLT (Block Transfer) instruction copies words from memory to memory. The left half of the selected AC specifies the first source address. The right half of the AC specifies the first destination address. The effective address specifies the last destination address. Words are copied, one by one, from the source to the destination, until a word is stored in an address greater than or equal to the effective address of the BLT.
Caution: BLT clobbers the specified AC. Don't use the BLT AC in address calculation for the BLT; results will be random. If source and destination overlap, remember that BLT moves the lowest source word first. If the destination of the BLT includes the BLT AC, then the BLT AC better be the last destination address.
Read more about Block-transfer Instruction: Programming Examples
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