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FEATURES OF SOME MICRO PROCESSORS 

8085

Popular 8-bit μP

Introduced in 1976

8 bit data bus

16 bit address bus

8 bit internal registers

8086

Introduced in 1978

16 bit data bus

16 bit internal register

20 bit address bus

5 – 8MHz Clock

Operation- Real mode only

Real mode of operation

 1 MB  directly addressable memory                         

80286

Advanced version of 8086

Introduced in 1982

24 bit address bus

16 bit data bus

 16 bit internal registers

Memory protection and management

16 MB directly addressable (Physical) memory

Clock speed : 10 – 16 MHz

Real and protected mode of operation

multi user and multi tasking capability

1 GB (2³⁰ ) of virtual memory

68 pin IC pacage

No multiplexed address/data bus 

80386

       CHMOS III Technology

 Introduced in 1985

32 bit address bus

 32 bit data bus

32bit internal registers

      compatible with 8086, 80286

      4 GB (2³²) directly addressable memory

 Clock speed : 20 - 50 MHz

 Instruction pipe lining

      Real protected and virtual mode of operation

      64 TB (2⁴⁶) of virtual memory

      Paging and memory management

 132 pin IC

 memory management

 pipeline architecture

 multi tasking

 cache memory                                                

Pentium

 Introduced in 1993

      64 bit address bus

      64 bit data bus

 32bit internal registers

 4 GB directly addressable memory

      Clock speed : 60 MHz – 3 GHz

      8K instruction cache and 8K address cache

      Implements RISC features

      237 pin PGA

      Instruction pipe linin