fourth generation computer - A computer built using Very Large Scale Integration(VLSI) integrated circuits, especially a microcomputer based on a microprocessor, or a parallel processor containing two to thousands of CPUs.
VLSI made it routine to fabricate an entire CPU, main memory, or similar device with a single integrated circuit that can be mass produced at very low cost. This has resulted in new classes of machines such as personal computers, and high performance parallel processors that contains thousands of CPUs.
Very Large Scale Integration-is the process of creating integrated circuits by combining thousands of transistors into a single chip
Fourth Generation (1971-Present)
Fourth Generation computers are the modern day
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COMPUTERS WERE NOW BEING CONTROLLED WITH A MOUSE AS WELL AS KEYBOARD. THE FIRST MOUSE WAS DEVELOPED IN 1981 BY XEROX.  SOFTWARE BECAME MUCH MORE COMMON AND DIVERSE DURING THIS PERIOD WITH THE DEVELOPMENT OF SPREADSHEETS, DATABASES, AND DRAWING PROGRAMS. COMPUTER NETWORKS AND E-MAIL BECAME MUCH MORE PREVALENT AS WELL. THE FIRST TRULY PORTABLE COMPUTER, CALLED THE OSBORNE 1, WAS RELEASED IN 1981. PORTABLE COMPUTERS LIKE THE TRS-80 MODEL 100 / 102 AND IBM 5155 FOLLOWED AFTERWARD.  NOT ALL THE COMPUTERS OF THE TIME WERE SMALL, OF COURSE. THERE WERE STILL BEING SUPERCOMPUTERS BUILT WITH THE AIM OF BEING AS FAST AS POSSIBLE. THESE SUPERCOMPUTERS WERE SOLD TO COMPANIES, UNIVERSITIES, AND THE MILITARY. AN EXAMPLE OF ONE SUCH SUPERCOMPUTER IS THE CRAY-1, WHICH WAS RELEASED IN 1976 BY CRAY RESEARCH.  IT BECAME ONE OF THE BEST KNOWN AND MOST SUCCESSFUL SUPERCOMPUTERS EVER FOR ITS UNIQUE DESIGN AND FAST SPEED OF 250 MFLOPS. THIS GENERATION WAS ALSO IMPORTANT FOR THE DEVELOPMENT OF EMBEDDED SYSTEMS. THESE ARE SPECIAL SYSTEMS, USUALLY VERY TINY, THAT HAVE COMPUTERS INSIDE TO CONTROL THEIR OPERATION.  THESE EMBEDDED SYSTEMS WERE PUT INTO THINGS LIKE CARS, THERMOSTATS, MICROWAVE OVENS, WRISTWATCHES, AND MORE.
advantages and disadvantages of 4th generation computer
Advantages 1. Smallest in size because of high component density. 2. Very