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 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) 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) 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 multiplexedįunctional blocks Computational Unit performs arithmetic and logic operations Various conditions of the results are stored as status bits called flags in flag register Internal storage of data Flag Register Timing and control unit Register array or internal memory Instruction decoding unit PC/ IP ALU Control Bus Address Bus Data Bus Generates the address of the instructions to be fetched from the memory and send through address bus to the memory Generates control signals for internal and external operations of the microprocessor Decodes instructions sends information to the timing and control unitĤ Overview First 16- bit processor released by INTEL in the year 1978 Mohsen NASRI College of Computer and Information Sciences, Majmaah University, Al MajmaahĢ Introduction Fifth Generation Pentium Fourth Generation During 1980s 1 8086 Microprocessor Assembly language programmingĬhapter 4: 8086 Microprocessor Assembly language programming Dr.

How to program a 8086 microprocessor