80386 range processors

80386DX

  • Introduced October 17, 1985
  • Clock rates:
    • 16 MHz with 5 to 6 MIPS
    • 20 MHz with 6 to 7 MIPS, introduced February 16, 1987
    • 25 MHz with 8.5 MIPS, introduced April 4, 1988
    • 33 MHz with 11.4 MIPS (9.4 SPECint92 on Compaq/i 16K L2), introduced April 10, 1989
  • Bus Width 32 bit data, 32 bit address
  • Number of Transistors 275,000 at 1 µm
  • Addressable memory 4 GB (4 GB)
  • Virtual memory 64 TB (64 TiB)
  • First x86 chip to handle 32-bit data sets
  • Reworked and expanded memory protection support including paged virtual memory and virtual-86 mode, features required at the time by Xenix and Unix. This memory capability spurred the development and availability of OS/2 and is a fundamental requirement for modern operating systems like Linux, Vista, and MacOS.
  • Used in Desktop computing


80960 (i960) (chronological entry)

80386SX

  • Introduced June 16, 1988
  • Clock rates:
    • 16 MHz with 2.5 MIPS
    • 20 MHz with 2.5 MIPS, introduced January 25, 1989
    • 25 MHz with 2.7 MIPS, introduced January 25, 1989
    • 33 MHz with 2.9 MIPS, introduced October 26, 1992
  • Internal architecture 32 bits
  • External data bus width 16 bits
  • External address bus width 24 bits
  • Number of Transistors 275,000 at 1 µm
  • Addressable memory 16 MB
  • Virtual memory 32 GB
  • Narrower buses enable low-cost 32-bit processing
  • Used in entry-level desktop and portable computing
  • No Math Co-Processor
  • No commercial Software used for protected mode or virtual storage for many years

80376

The Intel i376 is an embedded version of the i386SX.
  • Introduced January 16, 1989; Discontinued June 15, 2001
  • Variant of 386SX intended for embedded systems
  • No "real mode", starts up directly in "protected mode"
  • Replaced by much more successful 80386EX from 1994


80860 (i860) (chronological entry)

  • Introduced February 27, 1989


80486DX (chronological entry)

  • Introduced April 10, 1989

80386SL

  • Introduced October 15, 1990
  • Clock rates:
    • 20 MHz with 4.21 MIPS
    • 25 MHz with 5.3 MIPS, introduced September 30, 1991
  • Internal architecture 32 bits
  • External bus width 16 bits
  • Number of Transistors 855,000 at 1 µm
  • Addressable memory 4 GB
  • Virtual memory 1 TB
  • First chip specifically made for portable computers because of low power consumption of chip
  • Highly integrated, includes cache, bus, and memory controllers


80486SX/DX2/SL, Pentium, 80486DX4 (chronological entries)

  • Introduced 1991–1994

80386EX

  • Introduced August 1994
  • Variant of 80386SX intended for embedded systems
  • Static core, i.e. may run as slowly (and thus, power efficiently) as desired, down to full halt
  • On-chip peripherals:
    • Clock and power mgmt
    • Timers/counters
    • Watchdog timer
    • Serial I/O units (sync and async) and parallel I/O
    • DMA
    • RAM refresh
    • JTAG test logic
  • Significantly more successful than the 80376
  • Used aboard several orbiting satellites and microsatellites
  • Used in NASA's FlightLinux project

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