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Intel 8086

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Intel 8086

m have a proprietary extension providing the full 16-bit data bus of the 8086 CPU (similar in concept to the 16-bit slots of the IBM PC AT, but different in the design details, and physically incompatible).
  • The IBM PS/2 models 25 and 30 were built with an 8 MHz 8086.
  • The Amstrad/Schneider PC1512, PC1640, PC2086, PC3086 and PC5086 all used 8086 CPUs at 8 MHz.
  • The NEC PC-9801.
  • The Tandy 1000 SL-series and RL machines used 9.47 MHz 8086 CPUs.
  • The IBM Displaywriter word processing machine[8] and the Wang Professional Computer, manufactured by Wang Laboratories, also used the 8086.
  • NASA used original 8086 CPUs on equipment for ground-based maintenance of the Space Shuttle Discovery until the end of the space shuttle program in 2011. This decision was made to prevent software regression that might result from upgrading or from switching to imperfect clones.[9]
  • KAMAN Process and Area Radiation Monitors[10]
  • Notes

    1. ^ Fewer TTL buffers, latches, multiplexers (although the amount of TTL logic was not drastically reduced). It also permitted the use of cheap 8080-family ICs, where the 8254 CTC, 8255 PIO, and 8259 PIC were used in the IBM PC design. In addition, it made PCB layout simpler and boards cheaper, as well as demanding fewer (1- or 4-bit wide) DRAM chips.
    2. ^ using enhancement load PMOS logic (demanding 14V, achieving TTL-compatibility by having VCC at +5V and VDD at -9V)
    3. ^ using non-saturated enhancement load NMOS logic (demanding a higher gate voltage for the load transistor-gates)
    4. ^ made possible with depletion load nMOS logic (the 8085 was later made using HMOS processing, just like the 8086)
    5. ^ Rev.0 of the instruction set and architecture was ready in about three months, according to Morse.
    6. ^ Using rubylith, light boards, rulers, electric erasers, and a digitizer (according to Jenny Hernandez, member of the 8086 design team, in a statement made on Intel's web-page for its 25th birthday).
    7. ^ 8086 used less microcode than many competitors' designs, such as the MC68000 and others
    8. ^ Fast static RAMs in MOS technology (as fast as bipolar RAMs) was an important product for Intel during this period.
    9. ^ CHMOS is Intel's name for CMOS circuits manufactured using processing steps very similar to HMOS.
    10. ^ Other members of the design team were Peter A.Stoll and Jenny Hernandez.
    11. ^ Some 80186 clones did change the shift value, but were never commonly used in desktop computers.

    See also


    1. ^ "Microprocessor Hall of Fame". Intel. Archived from the original on 2007-07-06. Retrieved 2007-08-11. 
    2. ^ Official Intel iAPX 286 programmers' manual (page 1-1)
    3. ^ Birth of a Standard: The Intel 8086 Microprocessor. Thirty years ago, Intel released the 8086 processor, introducing the x86 architecture that underlies every PC-Windows, Mac, or Linux-produced today, PC World, June 17, 2008
    4. ^ Randall L. Geiger, Phillip E. Allen, Noel R. Strader VLSI design techniques for analog and digital circuits, McGraw-Hill Book Co., 1990, ISBN 0-07-023253-9, page 779 "Random Logic vs. Structured Logic Forms", illustration of use of "random" describing CPU control logic
    5. ^ Intel 8008 to 8086 by Stephen P. Morse et al.
    6. ^ a b c Osborne 16 bit Processor Handbook (Adam Osborne & Gerry Kane) ISBN 0-931988-43-8
    7. ^   (Similarly for iAPX 286, 80386, 80387.)
    8. ^ Zachmann, Mark (August 23, 1982). "Flaws in IBM Personal Computer frustrate critic". InfoWorld (Palo Alto, CA: Popular Computing) 4 (33): 57–58.  
    9. ^ For Old Parts, NASA Boldly Goes ... on eBay, May 12, 2002.
    10. ^ Kaman Tech. Manual

    External links

    • Architecture-Of-8086 and pin at
    • Intel datasheets
    • List of 8086 CPUs and their clones at
    • 8086 Pinouts
    • Maximum Mode Interface
    • The 8086 User's manual October 1979 INTEL Corporation (PDF document)
    • 8086 program codes using emu8086 (Version 4.08) Emulator
    • Intel 8086/80186 emulator written in C, this file is part of a larger PC emulator
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