Z80 CPU - Have you ever seen one?
Curiosities here:

Release:

• May 1976 by ZiLOG.

Number of transistors:

1. ZiLOG Z80 CPU: 8500. 
2. Intel 8085 CPU: 6500.
3. Intel 8080 CPU: 4500.

Instructions:

• 158 different "instruction types" (FUNCTIONS) including all 78 of the Intel 8080A CPU [datasheet].
• Intel 8080 CPU instructions: 256.
  • 196 fully compatible with Z80;
  • 58 DIFFERENT intructions opcodes;
  • 2 UNCOMPATIBLE FUNCTIONS.
  • Z80 compatibility: 76,56%.
• Z80 CPU:
  • Documented instructions: 694;
  • Undocumented instructions: 710;
  • Total instructions: 1404.

My model:

• Part No. Z84C0020PEC.
  •  "84C00" means "CMOS technology".
  • "20" means "20MHz max frequency".
  • "PEC" means "unfilled Poly(ethylene carbonate)" - therefore: Temperature range: Extended industrial: −40 °C to 85 °C.
• "1822 GZ" = UNKNOWN DATA.
  

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