Short Answer
The difference between 8085 and 8086 is mainly based on data size, architecture, and performance. The 8085 is an 8-bit microprocessor with a simpler design, while the 8086 is a 16-bit microprocessor with advanced features and higher speed.
In simple terms, 8085 is used for basic applications, whereas 8086 is used for more complex tasks. The 8086 has features like segmentation and pipelining, which make it more powerful than the 8085.
Detailed Explanation:
Difference between 8085 and 8086
The 8085 and 8086 microprocessors are both important processors developed by Intel, but they differ in many aspects such as data handling, architecture, memory capacity, and performance. The 8086 is an improved and more advanced version compared to the 8085.
Data size and processing capability
The 8085 is an 8-bit microprocessor, which means it can process 8 bits of data at a time. This limits its processing capability and makes it suitable for simpler applications.
The 8086, on the other hand, is a 16-bit microprocessor. It can process 16 bits of data at a time, which increases its speed and efficiency. Because of this, the 8086 can handle more complex operations compared to the 8085.
Addressing capability and memory
The 8085 has a 16-bit address bus, which allows it to access up to 64 KB of memory. This memory size is limited for larger applications.
The 8086 has a 20-bit address bus, which allows it to access up to 1 MB of memory. This larger memory capacity makes it suitable for advanced computing tasks.
Architecture design
The architecture of the 8085 is simple and does not support advanced features like pipelining. All operations are performed in a sequential manner.
The 8086 has a more advanced architecture. It is divided into two main units: the Execution Unit (EU) and the Bus Interface Unit (BIU). This design allows parallel processing, where instruction fetching and execution can happen at the same time.
Instruction execution speed
The 8085 has a slower execution speed because it processes instructions one by one without overlapping.
The 8086 is faster because it uses pipelining through an instruction queue. This means while one instruction is being executed, another can be fetched at the same time, improving efficiency.
Register structure
The 8085 has a limited number of registers, including general-purpose registers and special registers like accumulator, program counter, and stack pointer.
The 8086 has more registers, including general-purpose registers (AX, BX, CX, DX), pointer and index registers, and segment registers. This allows better data handling and flexibility.
Memory segmentation
The 8085 does not use memory segmentation. It accesses memory directly using a single address space.
The 8086 uses memory segmentation, which divides memory into segments like code, data, and stack. This helps in efficient memory management and allows larger programs to run.
Applications
The 8085 is used in simple control systems, small embedded applications, and educational purposes.
The 8086 is used in more advanced systems such as personal computers and complex embedded systems where higher performance is required.
Conclusion
The main difference between 8085 and 8086 lies in their data processing capability, architecture, and performance. The 8085 is simpler and suitable for basic tasks, while the 8086 is more advanced and powerful. Understanding these differences helps in selecting the right processor for different applications.