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данным ниже1. An operating system is a master control program [[1]] ______ and the running of application programs. All computers do not use the same operating systems. It is therefore important to assess the operating system used on a particular model before initial commitment because some software is only designed to run under the control of specific operating systems. Some operating systems are adopted as ‘industry standards’ and these are the ones which should be evaluated because they normally have a good software base. The reason for this is that software houses are willing to expand resources on the development of application packages for machines functioning under the control of an operating system which is widely used. The cost of software is likely to be lower in such circumstances [[2]] _______.2. Mainframe computers usually process several application programs concurrently, switching from one to the other, for the purpose of increasing processing productivity. This is known as multiprogramming (multi-tasking in the context of microcomputers), which requires a powerful operating system incorporating work scheduling facilities to control the switching between programs. This entails reading in data for one program [[3]] _______ and printing out the results on yet another.3. In multi-user environments an operating system is required to control terminal operations on a shared access basis [[4]] _______. The operating system allocates control to each terminal in turn. Such systems also require a system for record locking and unlocking, to prevent one user attempting to read a record whilst another user is updating it, for instance. The first user is allocated control to write to a record (or file in some instances) and [[5]] _______ until the record is updated or unlocked.4. Some environments operate in concurrent batch and real-time mode. This means that a ‘background’ job deals with routine batch processing [[6]] _______ such as airline seat reservation, on-line booking of hotel accommodation, or control of warehouse stocks, etc. The real-time operation has priority, and the operating system interrupts batch processing operations [[7]] _______. The stage of batch processing attained at the time of the interrupt is temporarily transferred to backing storage. [[8]] _______, the interrupted program is transferred back to internal memory from backing storage, and processing recommences from a ‘restart’ point. The operating system also copies to disk backing storage the state of the real-time system every few minutes (periodic check points) to provide a means of ‘recovering’ the system in the event of a malfunction.5. [[9]]_______ and has to be booted into the internal memory (RAM) where it must reside throughout processing so that commands are instantly available. The operating system commands may exceed the internal memory capacity of the computer in which case only that portion of the OS which is frequently used is retained internally, [[10]]_______. Many microcomputers function under the control of a disk operating system known as DOS.