Evolution of Microprocessor (Intel Series)

Intel 4004

• Year of introduction 1970
• 4-bit MP
• 4 KB memory
• Speed: 108 KHz
• World’s first MP

Intel 8008

• Year of introduction 1972
• 8-bit version of 4004
• 16 KB memory
• Slow

Intel 8080

• Year of introduction 1974
• 8-bit MP
• Speed: 2 MHz
• First general purpose MP used as CPU of computer
• 64 KB memory

Intel 8085

• Year of introduction 1975
• 8-bit MP
• 64 KB memory
• 8-bit data bus

Intel 8086

• Year of introduction 1976
• 16-bit MP
• 1 MB memory
• 6-byte instruction queue (cache)
• 16-bit data bus
• Speed: 4.77 MHz

Intel 8088

• Year of introduction 1979
• First MP used in the original IBM PC
• 8-bit data bus
• 1 MB memory
• Speed: 4.77 MHz
• 4-byte instruction queue (cache)

Intel 80286

• Year of introduction 1982/1983
• 16-bit MP with memory and protection
• 16 MB memory
• Speed: 8 MHz
• Multitasking feature implemented

Intel 80386

• Year of introduction 1986
• First practical 32-bit MP
• 4 GB memory

Intel 80486

• Year of introduction 1989
• 32-bit high performance MP
• 4 GB memory

Pentium

• Year of introduction 1993
• 32-bit MP
• 64-bit external data bus
• 4 GB memory
• 16 KB cache