a 8-bit microprocessor from Intel released in April 1974 running at 2 MHz. The 8080 is generally considered to be the first truly usable microprocessor. It had an 8-bit data-bus and 16-bit address-bus, allowing to address 64 KByte of memory, containing program code as well as data (Von Neumann architecture).
8080 had seven byte-registers: A, B, C, D, E, H, and L. A was the 8-bit accumulator for most arithmetical and logical instructions and the other six could be used as either byte-registers or as three 16-bit register pairs (BC, DE, HL) depending on the particular instruction. HL was also used as (a limited) 16-bit accumulator. It further had a 16-bit stack pointer register and an 16-bit instruction pointer. After a hardware reset ip was cleared zero and started to fetch the first instruction from that address.
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- 8080/Z80 Instruction Set
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- Die shot of NEC 8080AF microprocessor by Pauli Rautakorpi
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