X86-Secret : ES Zone
Zilog Z8612 ES  (Week 46, Year 1983)   
ZILOG Z8612-12CS Z8 4K XROM 8346 ES

The famous Z8612 MCU from Zilog. Clocked at a blazing speed of 12 MHz, the Z80 line was one of the first competitor for the x86 line from Intel in early '80. It comes with 4 Kbits of internal RAM and is built on a 64-pin ceramic DIP