Note for Computer Organisation and Architecture - COA By Praveen Raju Prathikantam

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8086 Microprocessor P.PRAVEEN RAJU Associate Professor ECE Department Sreyas Institute of Engineering and Technology

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Microprocessor Program controlled semiconductor device (IC) which fetches (from memory), decodes and executes instructions. It is used as CPU (Central Processing Unit) in computers. 3

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Microprocessor Third Generation During 1978 HMOS technology  Faster speed, Higher packing density 16 bit processors  40/ 48/ 64 pins Easier to program Dynamically relatable programs Processor has multiply/ divide arithmetic hardware More powerful interrupt handling capabilities Flexible I/O port addressing Intel 8086 (16 bit processor) First Generation Between 1971 – 1973 PMOS technology, non compatible with TTL 4 bit processors  16 pins 8 and 16 bit processors  40 pins Due to limitations of pins, signals are multiplexed Fifth Generation Pentium Fourth Generation During 1980s Low power version of HMOS technology (HCMOS) 32 bit processors Physical memory space 224 bytes = 16 Mb Virtual memory space 240 bytes = 1 Tb Floating point hardware Supports increased number of addressing modes Intel 80386 Second Generation During 1973 NMOS technology  Faster speed, Higher density, Compatible with TTL 4 / 8/ 16 bit processors  40 pins Ability to address large memory spaces and I/O ports Greater number of levels of subroutine nesting Better interrupt handling capabilities Intel 8085 (8 bit processor) 4