Comparison of 8085 and 8086 Microprocessor

1.Size:-

•       8085 is 8 bit microprocessor whereas 8086 is 16 bit microprocessor.

2.Address Bus:-

•      8085 has 16 bit address bus and 8086 has 20 bit addres bus.

3.Memory:-

•      8085 can access upto 2^16 = 64 Kb of memory whereas 8086 can access upto 2^20 = 1 MB of memory.

4.Instruction Queue:-

•      8085 doesn't have an instruction queue whereas 8086 has instruction queue.

5.Pipelining:-

•      8085 does not support pipelined architechture whereas 8086 supports pipelined architechture.

6.Multiprocessing Support:-

•      8085 does not support multiprocessing support whereas 8086 supports.

7.I/O:-8085 can address 2^8 = 256 I/O's and 8086 can access 2^16 = 65,536 I/O's

8.Airthmetic Support:-

•      8085 only supports integer and decimal whereas 8086 supports integer, decimal and ASCII arithmetic.

9.Multiplication and Division:-

•      8085 doesn't support whereas 8086 supports.

10. Operating Modes:-

•      8085 supports only single operating mode whereas 8086 operates in two modes.

11.External Hardware:-

•      8085 requires less external hardware whereas 8086 requires more external hardware.

12.Cost:-

•      The cost of 8085 is low and 8086 is high.

•      13.Memory Segmentation:-

In 8085, memory space is not segmented but in 8086, memory space is segmented.