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 for Intel 8080
From The Free On-line Dictionary of Computing (30 December 2018) :

  Intel 8080
      The successor to the Intel 8008.  The 8080 had a
     16-bit address bus and an 8-bit data bus.  It had seven
     8-bit registers (six which could also be combined as three
     16-bit registers), a 16-bit stack pointer to memory which
     replaced the 8008's internal stack and a 16-bit program
     counter.  It also had 256 I/O ports (so I/O devices could be
     connected without needing to allocate any addressing space as
     is required for memory mapped devices) and a signal pin that
     allowed the stack to occupy a separate bank of memory.
     Shortly after the 8080, the Motorola 6800 was introduced.

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