Intel 8085 microprocessor family

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8080
  • » 8-bit microprocessor
  • » Up to 4 MHz
  • » 64 KB RAM
  • » Stack in RAM
  • » 256 I/O ports
40-pin DIP
8085
  • » 8-bit microprocessor
  • » Up to 8 MHz
  • » 64 KB RAM
  • » Single voltage
  • » On-chip peripherals
  • » 256 I/O ports
  • » 8080 object-code compatible
40-pin DIP
44-pin PLCC
Z80
  • » Up to 33 MHz
  • » 8080 compatibility mode
8086
  • » 16-bit microprocessor
  • » 16-bit data bus
  • » Up to 10 MHz
  • » 1 MB RAM
  • » 64K I/O ports
40-pin DIP
56-pin QFP
44-pin PLCC
Intel 8085 microprocessor is the next generation of Intel 8080 CPU family. In addition to being faster than the 8080, the 8085 had the following enhancements:
  • Intel 8085 had single 5 Volt power supply.
  • Clock oscillator and system controller were integrated on the chip.
  • The CPU included serial I/O port.
  • Two new instructions were added to 8085 instruction set. The CPU also included a few undocumented instructions. These instructions were supposed to be a part of the CPU instruction set, but at the last moment they were left undocumented because they were not compatible with forthcoming Intel 8086.
  • Full list of differences between Intel 8080 and 8085 processors.

There were multiple versions of 8085 microprocessors. The original version of the 8085 microprocessor without suffix "A" was manufactured by Intel only, and was very quickly replaced with 8085A containing bug fixes. A few years after that, around 1980, Intel introduced 8085AH - HMOS version of 8085A. There was also 80C85A - CMOS version of the 8085A. It's not clear if 80C85 was ever manufactured by Intel or not, but it was produced by at least two second source manufacturers - OKI and Tundra Semiconductor. Tundra Semiconductor manufactured the fastest 8085 microprocessor running at 8 MHz.

Second source manufacturers: AMD, Mitsubishi, NEC, OKI, Siemens, Toshiba. Soviet Union also manufactured clones of Intel 8085 CPU.

Computers
Radio Shack TRS-80 Models 100 and 200, CompuPro 8/16.

Die pictures:
Use the filter below to display manufacturers that have specific feature(s) incorporated:

List of 8085 manufacturers

AMD AM8085A-2DC / C8085A-2

5 MHz
40-pin ceramic DIP
Purple ceramic/gold top/gold pins

Picture of: AMD AM8085A-2DC / C8085A-2

Intel C8085

3 MHz
40-pin ceramic DIP
Purple ceramic/black top/tin pins

Picture of: Intel C8085

NEC D8085A

3 MHz
40-pin ceramic DIP
White ceramic/silver top/gold pins

Picture of: NEC D8085A

Mitsubishi M5L8085AP

3 MHz
40-pin plastic DIP

Picture of: Mitsubishi M5L8085AP

OKI MSM80C85ARS

OKI MSM80C85A microprocessors, implemented in CMOS technology, had a couple of advantages over NMOS 8085 microprocessors. MSM80C85A had greater operating temperature range from -40 to 85°C and they didn't use as much power as NMOS 8085 microprocessors. For example, this OKI MSM80C85ARS uses 8 times less power than Intel 8085 microprocessor running at the same frequency.

Picture of: OKI MSM80C85ARS

Siemens SAB8085A-C / SAB8085AC

3 MHz
40-pin ceramic DIP
Purple ceramic/silver top/tin pins

Picture of: Siemens SAB8085A-C / SAB8085AC

Toshiba TMP8085AP

3 MHz
40-pin plastic DIP

Picture of: Toshiba TMP8085AP

USSR IM1821VM85A

3.6 MHz
40-pin ceramic DIP
White ceramic/silver top/tin pins

Soviet clone of Intel 80c85 processor
Military version

Picture of: USSR IM1821VM85A

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At a glance

Type:
8-bit microprocessor
Introduction:
1976
Technology (micron):
2 - 3
Frequency (MHz):
3 - 6
Sockets:
DIP40
PLCC44
QFP44