Intel

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)

• Introduced April 5, 1988
• See main 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