Intel 8085


The Intel 8085 is an 8-bit microprocessor introduced by Intel in 1976. It was an enhancement of the Intel 8080, operating at a higher clock speed and requiring less supporting hardware. It was designed for use in a range of early personal computers, industrial equipment, and other electronic devices.


The phonetics for the keyword “Intel 8085″ would be:”ɪn-tel eɪt-ou-zerou-eɪt-faɪv”

Key Takeaways

  1. The Intel 8085 is an 8-bit microprocessor, which was launched by Intel in the late 1970s, and is an extended version of the Intel 8080 processor.
  2. It operates on a single +5V power supply, offers 74 instructions, and has 246 opcodes, allowing for a versatile range of programming possibilities.
  3. The Intel 8085 comes with 74 input/output (I/O) ports, and is designed with a 16-bit address bus, which gives it the ability to address up to 64KB of memory.


The Intel 8085 microprocessor is significant in the realm of technology as it marked a considerable step forward in the development of microprocessors.

Introduced in the late 1970s, the 8085 was an 8-bit microprocessor with a faster clock speed, improved performance, and reduced power consumption as compared to its predecessor, the Intel 8080.

It laid the groundwork for future advancements in computer processing and contributed to the early onset of microcomputer technology by serving as the foundation for various hardware applications of that era.

Additionally, it played a vital role in fostering a budding interest in the field of electronics, and the 8085’s accessible instruction set made it a preferred choice in the education sector for those learning about microprocessor systems.


The Intel 8085 microprocessor, introduced in 1977, served as a pivotal milestone in computer technology as it aimed to expedite processing power and augment the development of compact personal computers. This 8-bit microprocessor, a successor to the 8080 model, significantly redefined the architecture of computers by substantially reducing the number of support chips required for their operation.

Its purpose was to cater to a wide array of applications, including data terminals, traffic light control systems, and household appliances, thereby facilitating the swift implementation of computer technology in various industries. Noteworthy for its user-friendly design, the Intel 8085 microprocessor enabled developers to efficiently create systems and programs.

Equipped with a robust instruction set, the 8085 permitted programmers to develop intricate software through a simpler machine language, enhancing the functionality of devices. Furthermore, this microprocessor also reduced the power consumption (5 volts) without compromising on its clock speed (up to 3.2MHz), making it suitable for portable, battery-operated electronic devices.

The Intel 8085’s versatile applications and revolutionary architecture played a crucial role in shaping the microcomputer landscape and endorsing the adoption of computing in everyday life.

Examples of Intel 8085

The Intel 8085 microprocessor, introduced in 1977, was widely used in various devices and embedded systems. Here are three real-world examples of the technology:

Traffic Light Controller System: The Intel 8085 microprocessor was commonly used in traffic light controller systems during the 1980s and 1990s. This system helped regulate traffic flow by controlling multiple signals based on a fixed timing cycle and traffic density. The 8085’s cost-effectiveness, reliability, and simplicity made it an ideal choice for this application.

Industrial Automation Systems: Manufacturing units and factories adopted the Intel 8085 for controlling machines and robotics during the 1980s. The microprocessor offered programmable logic controllers (PLCs) with simple input/output operations and quick signal processing to execute critical automation tasks. For instance, systems utilizing 8085 helped automate the assembly line process, ensuring optimal productivity and minimizing manual labor.

Home Computers: Several home computer systems produced in the late 1970s and early 1980s used the Intel 8085 microprocessor. Notable examples are Kyotronic 85, Tandy TRS-80 Model 100, and Olivetti M

These portable computers used the 8085’s capabilities for offering basic word processing, data management, and limited programming functionalities. The Intel 8085 enhanced the computing power of these devices without being very expensive for consumers.While more powerful microprocessors have since replaced the Intel 8085 in most areas, its historical significance and contribution to the evolution of technology are unquestionable.

FAQ: Intel 8085

What is the Intel 8085?

The Intel 8085 is an 8-bit microprocessor designed by Intel in the mid-1970s. It became popular as the central processing unit (CPU) of choice in a variety of early microcomputers and personal computers.

What are the main features of the Intel 8085?

The Intel 8085 has a 74-instruction set, 246 opcode fetches, on-chip clock generation, and direct memory access (DMA) capability. It also supports five 8-bit registers, one 16-bit stack pointer, one 16-bit program counter, and 74 input/output ports.

What is the difference between the Intel 8085 and 8086?

The primary difference between the Intel 8085 and 8086 is that the 8085 is an 8-bit microprocessor, while the 8086 is a 16-bit microprocessor. Additionally, the 8085 has a smaller instruction set and fewer addressing modes than the 8086, which provides a more robust computing platform.

What type of memory does the Intel 8085 support?

The Intel 8085 supports up to 64KB of RAM and ROM memory using a 16-bit address bus. This allows for a wide range of memory configurations that can be tailored to the specific needs of the system being built.

What is the clock speed of the Intel 8085?

The clock speed of the Intel 8085 typically ranges between 3 MHz and 6 MHz, depending on the specific variant. This provides relatively fast processing for 8-bit operations and basic computing tasks.

Related Technology Terms

  • 8-bit microprocessor
  • 74 instructions
  • 3.2 MHz clock speed
  • 2468 transistors
  • 5-volt power supply

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