Sunday, September 6, 2009

Notes and references of microprocesser(8086)

^ "Microprocessor Hall of Fame". Intel. Retrieved 2007-08-11.
^ It also permitted cheap 8080-family chips to be used (such as the 8254 CTC, 8255 PIO, and 8259 PIC which 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.
^ using enhancement load pMOS logic (demanding 14V, achieving TTL-compatibility by having VCC at +5V and VDD at -9V)
^ using non-saturated enhancement load nMOS logic (demanding a higher gate voltage for the load transistor-gates)
^ made possible with depletion load nMOS logic (the 8085 was later made using HMOS processing, just like the 8086)
^ Two years from idea to product was considered fast for a complex design as almost no CAD-tools were used; four engineers and 12 layout people were simultaneously working on the chip.
^ 8086 used less microcode than many competitors designs, such as the MC68000 and others
^ Fast static RAMs in MOS technology (as fast as bipolar RAMs) was an important product for Intel during this period.
^ CHMOS is intels name for CMOS circuits manufactured using processing steps very similar to HMOS.
^ The designers actually contemplated using an 8-bit shift (instead of 4-bit), in order to create a 16 MB physical address space. However, as this would have forced segments to begin on 256 byte boundaries, and 1 MB was considered very large for a microprocessor around 1976, the idea was dismissed. Also, there were not enough pins available on a low-cost 40-pin package. — Intel 8008 to 8086 by Stephen P. Morse et al.
^ Faster on 16-bit, although slower on 8-bit quantities, compared to typical contemporary "8-bit" CPUs.
[edit] See also
IBM Personal Computer XT
x86 architecture
[edit] External links
Intel datasheets
List of 8086 CPUs and their clones at
8086 Pinouts

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