any 8-bit register and an HL-addressed memory byte. Due to the regular encoding of the instruction (using a quarter of available opcode space), there are redundant codes to copy a register into itself (, for instance), which are of little use, except for delays. The systematic opcode for is instead used to encode the halt ({{code) instruction, halting execution until an external reset or interrupt occurs.

16-bit operations

Although the 8080 is generally an 8-bit processor,

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