Intel 80386EX

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The Intel 80386EX (386EX) is a variant of the Intel 386 microprocessor designed for embedded systems. Introduced in August 1994 and was successful in the market being used aboard several orbiting satellites and microsatellites.

Intel did not manufacture another integrated x86 processor until 2007, when it confirmed the new Pentium M-based Intel EP80579 (Tolapai).


  • Introduced August 1994
  • Variant of 80386SX intended for embedded systems
  • 26-bit memory addressing for up to 64 MiB of DRAM
  • Static core, i.e. may run as slowly (and thus, power efficiently) as desired, down to full halt
  • On-chip peripherals:
    • clock and power management
    • timers/counters
    • watchdog timer
    • serial I/O units (synchronous and asynchronous) 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


External links

  • (Broken link (20/3/2011))

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