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The 8086 88 Family Pdf Download contains the complete 80286 8880286 family of microcomputer systems. It includes functional details of all versions of the 8086, 80286, and related products. This provides a complete view of the 8086 system architecture, with respect to hardware design layout, bus structure, registers and instructions set on each microprocessor unit along with timing diagrams for all devices on each bus. The pdf also includes a hardware reference manual on how to setup or troubleshoot any version of the entire family including technical documentation for various peripherals offered by Intel on their x86 platform. The 8086 family of computer systems were designed by Intel to keep their profit margins high with the introduction of the first microprocessor with a 16 bit data bus in 1977 The https://en.wikipedia.org/wiki/80286_%28microprocessor%29 is the first microprocessor in the 80286 family, released March 1978. It is a 16-bit architecture with a 32-bit data bus implemented using an 8-bit address bus and at least 4 external ports, including an 8255 AIC. The processor had a 16-bit data bus, which is not shown in the above illustration. The processor was fabricated on a 0.25 micrometer (0.025 µm) CMOS process and had a 64-bit internal data path. The 80286 microprocessor has 32 general purpose registers; an 8-bit ALU; and two 8-bit index registers that can both be used as general purpose registers through bitwise OR'ing with the ALU output. It does not have an accumulator register, but most instructions can result in an accumulator value being used as part of the result so it is included here for completeness. The 80286 has a 4-bit internal bus for accessing 8 general purpose registers. The bits 11:8 of the index register are used as segment registers that point to the base address of the segment register. The bits 3:0 form a 24-bit address bus, and one bit is used as a "displacement" control bit. The displacement control bit has two functions: first, it determines whether the high order bit 7 should be set on load and store instructions; and second, it controls multiple data transfers between memory and general registers through the use of an internal flag register. The 80286 can issue up to three instructions per clock cycle for fast, pipelined execution. There are eight 8-bit ALU operations and three 8-bit index register operations per clock cycle. The 80286 instruction set includes several new instructions to support longer, but fixed length, data types. It also includes a few new instructions for the 86 × 86 instruction set, including bitwise logical subtraction, logical product, and logical exclusive or. Other instructions include more general purpose functions such as repeatedly adding together the four least significant bits of a single byte in memory or shifting an entire data word left by one bit position at a time. The 80287 is an undocumented variation of the 8086 family. The processor was fabricated on a 0.25 micrometer (0. cfa1e77820
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