Intel 8086

16-bit microprocessor · 40-pin DIP · drag to rotate, scroll to zoom, click a pin

Operating mode

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• Released by Intel in 1978; ~29,000 transistors, HMOS

• 16-bit data bus, 20-bit address bus → 1 MB memory (00000h–FFFFFh)

• Clock 5 MHz (8086), 8 MHz (8086-1), 10 MHz (8086-2); supply +5 V

• Two units: Bus Interface Unit (BIU, 6-byte prefetch queue) and Execution Unit (EU)

• Reset vector: CS:IP = FFFFh:0000h → physical address FFFF0h

• 64 KB I/O space; 256 interrupt vectors