Computer Generations G eneration in computer terminology is a change in technology. A computer is being use it provides a frame work of the growth of computer industry. The term "generation" was used to difference between hardware and software that together makeup a computer system. There are totally fife computer generation known till today. Although there is a certain amount of overlap between different generations, the approximate period show against each are normally accepted. The period first generation(1942-1955 The computer of first generation used vacuum tubes as the basic component of memory of CPU. These tubes, like electronic bulb, produced a lot of heat and the isolation used to fuse frequently therefore, they were very expensive and only large organization were able to it. Punch ca...
Single partition allocation, Multiple-partition allocation and Fixed Equal-size partitions in operating system-computer world
Single partition allocation, Multiple-partition allocation and Fixed Equal-size partitions in operating system Single partition allocation In this scheme operating system is residing in law memory and user process are executing in higher memory. Advantages It is simple It is easy to understand and use Disadvantages User job is limited to the size of available memory. It leads to poor Utilization of processor and memory. Multiple-partition allocation It is the simplest method for allocating memory is divided memory into several fixed size partitions. Fixed Equal-size partitions It divides the main memory Into equal number of fixed sized partitions, operating system occupies some fixed portion and remaining portion of main memory is available for user processes. Advantages It supports multi programming. A process whose size is less then or equal to the partitions size can be loaded into any available partition. Disadvantages If a program is big to fit in...