Zilog Z80 microprocessor family

2.5 MHz
40-pin ceramic DIP

Very rare version of the Zilog Z80 processor in white ceramic package. Z80 microprocessors were released in July 1976 (May 1976 according to Federico Faggin's www.intel4004.com website). Production date of the chip on the picture is 23th week of 1976 (end of May or beginning of June) - one month before the CPU family was officially released or a few weeks after that (if the May 1976 introduction date is correct).

2.5 MHz
40-pin plastic DIP

Starting from around 1979, many Z80 processors in ceramic dip package were marked with "CS" letters. Sometimes these letters are misidentified as "Customer Sample", when in fact the letters stand for "C" - ceramic package, and "S" - commercial temperature range.

Earlier ceramic and plastic Z80 processors were marked the same way, either as "Z80 CPU / Z80A CPU" or "Z80-CPU / Z80A-CPU", even though their order numbers were different. By the end of 1978 / beginning of 1979 the markings have changed. The second line of newer markings included part number "8400", and two letters, used to identify CPU package type and operating temperature range, were added to the third line.

2.5 MHz
40-pin ceramic DIP

2.5 MHz
40-pin plastic DIP

4 MHz
40-pin ceramic side-brazed DIP

4 MHz
40-pin ceramic side-brazed DIP

4 MHz
40-pin ceramic side-brazed DIP

4 MHz
40-pin ceramic DIP

4 MHz
40-pin plastic DIP

4 MHz
40-pin ceramic DIP

4 MHz
40-pin ceramic DIP

4 MHz
44-pin plastic LCC

6 MHz
40-pin ceramic DIP

6 MHz
40-pin ceramic DIP

6 MHz
40-pin plastic DIP

6 MHz
40-pin plastic DIP

8 MHz
40-pin plastic DIP

4 MHz
40-pin ceramic DIP

4 MHz
40-pin plastic DIP

4 MHz
44-pin plastic LCC

6 MHz
40-pin plastic DIP

6 MHz
40-pin plastic DIP

6 MHz
44-pin plastic LCC

8 MHz
40-pin plastic DIP

4 MHz
40-pin plastic DIP

4 MHz
40-pin plastic DIP

4 MHz
44-pin plastic LCC

6 MHz
44-pin plastic QFP

6 MHz
40-pin plastic DIP

6 MHz
40-pin plastic DIP

6 MHz
44-pin plastic LCC

6 MHz
44-pin plastic LCC

8 MHz
44-pin plastic QFP

8 MHz
40-pin plastic DIP

8 MHz
44-pin plastic LCC

8 MHz
44-pin plastic LCC

10 MHz
44-pin plastic QFP

10 MHz
40-pin plastic DIP

20 MHz
44-pin plastic QFP

20 MHz
40-pin plastic DIP

20 MHz
44-pin plastic LCC

Z84C01 microprocessor is object-code compatible with Z80 CPU, but is not pin-compatible with it. In addition to all features, found in Z80, the Z84C01 adds on-chip clock generator, and allows external hardware to control how the processor operates when HALT instruction is executed. During HALT instruction the CPU may switch to:

• RUN mode that doesn't stop CPU operations at all,
  
• IDLE1 and IDLE2 modes, which stop the CPU core, but do not stop internal clock oscillator,
  
• STOP mode, which stops all processor's operations.
  As far as we know, only 10 MHz version of the Z84C01 microprocessor was manufactured.