Subject: MICROPROCESSOR & PERIPHERALS INTERFACING

Topic: Architecture of 8086 Microprocessor

Difficulty:HIGH

Comparison between 8085 & 8086 Microprocessor

Size − 8085 is 8-bit microprocessor, whereas 8086 is 16-bit microprocessor.

Address Bus − 8085 has 16-bit address bus while 8086 has 20-bit address bus.

Memory − 8085 can access up to 64Kb, whereas 8086 can access up to 1 Mb of memory.

Instruction − 8085 doesn’t have an instruction queue, whereas 8086 has an instruction queue.

Pipelining − 8085 doesn’t support a pipelined architecture while 8086 supports a pipelined architecture.

I/O − 8085 can address 2^8 = 256 I/O's, whereas 8086 can access 2^16 = 65,536 I/O's.

Cost − The cost of 8085 is low whereas that of 8086 is high.