Difference between 8085 and 8086 Microprocessor

In this article, we will discuss the Difference between 8085 and 8086 Microprocessor.

8085 Microprocessor 8086 Microprocessor
Size 8085 is an 8-bit microprocessor. 16-bit microprocessor
Address Bus 8085 has 16-bit address bus 8086 has 20-bit address bus
Memory 8085 can access upto 216 = 64 Kb of memory. 8086 can access upto
220 = 1 MB of memory.
Instruction Queue 8085 doesn’t have an instruction queue. 8086 has instruction queue.
Pipelining 8085 does not support pipelined architecture. 8086 supports pipelined architecture.
Multiprocessing Support 8085 does not support multiprocessing support. 8086 support multiprocessing support
I/O 8085 can address 28 = 256 I/O’s 8086 can access 216 = 65,536 I/O’s
Arithmetic Support 8085 only supports integer and decimal. 8086 supports integer, decimal and ASCII arithmetic.
Multiplication and Division 8085 doesn’t support. 8086 supports.
Operating Modes 8085 supports only single operating mode. 8086 operates in two modes.
External Hardware 8085 requires less external hardware. 8086 requires more external hardware.
Cost Low High
Memory Segmentation memory space is not segmented memory space is segmented

Comparison of 8085 and 8086 Microprocessor

8085 Microprocessor

  1. 8085 is 8-bit Microprocessor.
  2. 8085 has 16-bit address line.
  3. 8085 has 8-bit data bus.
  4. The speed is 3 MHz.
  5. 8085 has 5 flags.
  6. It does not support pipelining.
  7. It does not support memory segmentation.
  8. 8085 has 6500 transistors.
  9. 8085 has no minimum or maximum mode.
  10. 8085 only 64 KB memory is used together.

8086 Microprocessor

  1. 8086 is 16-Bit Microprocessor.
  2. 8086 has 20-bit address line.
  3. It has 16-bit data bus.
  4. The speed can vary between 5,8, and 10MHz for three different microprocessors.
  5. 8086 has 9 flags.
  6. It supports pipelining.
  7. It supports memory segmentation.
  8. 8086 has 29000 transistors.
  9. 8086 has a minimum or maximum mode.
  10. 1 MB memory is used.

The comparison table is shown below.

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