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Z80 class ICs
Z80 information
The Zilog Z80 is an 8-bit microprocessor introduced in July 1976. It was widely used both in desktop and embedded computer designs as well as for defense purposes, and is one of the most popular CPUs of all time. It was designed (by Federico Faggin and Masatoshi Shima) to be binary compatible with the Intel 8080 so that most 8080 code could run unmodified on it, notably the CP/M operating system.
The Z80 offered eight real improvements over the 8080:
  • An enhanced instruction set (80 new instructions)
  • Two separate register files, which could be quickly switched, to speed up response to interrupts
  • Block move, block I/O, and byte search instructions
  • Bit manipulation instructions
  • A built-in DRAM refresh address counter that would otherwise have to be provided by external circuitry
  • Single 5 Volt power supply
  • Fewer outboard support chips required for clock generation and interface to memory and I/O
  • A much lower price
The Z80 quickly took over from the 8080 in the market, and became one of the most popular 8-bit CPUs. Later versions increased in speed from the early models' 2.5 MHz up to as much as 25 MHz.
It was second sourced and cloned by many companies like Mostek (as MK3880), NEC (as D780C), SGS, Sharp (as LH0080) and Toshiba (as TMPZ84). Clones of this processor were manufactured in East Germany (as U880), Romania and the Soviet Union.
In the early 1980s the Z80 was very popular in 8-bit computer designs, e.g. and literally hundreds of others.
References: Z80 info  Wikipedia  CPU World 
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19 Z80 chips in collection: show thumbnails
 Eastern Bloc
   Z80 FWE U880D (GDR)
   Z80 MME UA880D (GDR)
   Z80 MME UB880D (GDR)
   Z80 MME VB880D (GDR)
  3880 (Z80)
  3881 (Z80 PIO)
  D780C (Z80)
   Z80 Z8400AB1
   Z80 TMPZ84C00AP
   Z80 TMPZ84C00AP-10
  Z80 peripheral
   Z80 peripheral TMPZ84C30P CTC
   Z80 peripheral TMPZ84C42P SIO
   Z80A 8400W2N A
   Z80A Z8400APS
   Z80 Z0840004PSC
   Z80 Z84C0006PEC
  Z80 peripheral
   Z80 peripheral Z84C3004PEC CTC
   Z80 peripheral Z84C4004PEC SIO/O