LOADING AN OPERATING SYSTEM:
Once the operating system is installed in a normal PC, it resides in the boot sector of the hard disc. As soon as the power is switched on, the program in ROM enables the CPU to transfer the operating system software from the hard disc boot sector, to the main memory and displays a C:> on the monitor. The user can take control once the operating system is loaded.
In a multiuser system, the operating system is loaded from the hard disc to the main memory. Since the components of the operating system itself, and corresponding messages are displayed on the system console. Once it is fully loaded, the user terminals displays LOGIN as the prompt in each terminal, indicating that the system is ready for use.
HISTORY OF THE DEVELOPMENT OF OPERATING SYSTEMS:
Earlier, computers in the 50’s 60’s like IBM 1620, IBM 360, DEC systems etc., had very little memory- 48KB or 64KB, compared to what is available today like 500 GB, 1TB or more even in PCs. Earlier Operating systems were very primitive and occupied only limited space in the main memory. They could perform only certain limited tasks on their own, without depending on the computer.
Digital released in 1970. CP/M (Control Program Monitor) operating system for hoem computers, and later MP/m (Multi program Monitor) for a limited multiuser facility.
Microsoft released in the 80’s MS-DOS (Microsoft Disc Operating System) for IBM PCs, which became very popular and emerging as a standard with different versions and releases. Now Windows provides Graphic User Interface (GUI) for system usage embedding in itself, DOS.
AT&T’s Bell laboratories released UNIX as a multiuser and multitasking , time sharing operating system in 1980 and also other companies upgraded it with different levels and versions. UNIX system V emerged as the major and popularly used operating system in the software world, for many years, in commercial, scientific and graphic applications for multiuser systems and is rapidly evolving as the standard operating system for open systems, graphic workstations and multiprocessor systems.
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Friday 1 July 2011
LOADING AN OPERATING SYSTEM:
Once the operating system is installed in a normal PC, it resides in the boot sector of the hard disc. As soon as the power is switched on, the program in ROM enables the CPU to transfer the operating system software from the hard disc boot sector, to the main memory and displays a C:> on the monitor. The user can take control once the operating system is loaded.
In a multiuser system, the operating system is loaded from the hard disc to the main memory. Since the components of the operating system itself, and corresponding messages are displayed on the system console. Once it is fully loaded, the user terminals displays LOGIN as the prompt in each terminal, indicating that the system is ready for use.
HISTORY OF THE DEVELOPMENT OF OPERATING SYSTEMS:
Earlier, computers in the 50’s 60’s like IBM 1620, IBM 360, DEC systems etc., had very little memory- 48KB or 64KB, compared to what is available today like 500 GB, 1TB or more even in PCs. Earlier Operating systems were very primitive and occupied only limited space in the main memory. They could perform only certain limited tasks on their own, without depending on the computer.
Digital released in 1970. CP/M (Control Program Monitor) operating system for hoem computers, and later MP/m (Multi program Monitor) for a limited multiuser facility.
Microsoft released in the 80’s MS-DOS (Microsoft Disc Operating System) for IBM PCs, which became very popular and emerging as a standard with different versions and releases. Now Windows provides Graphic User Interface (GUI) for system usage embedding in itself, DOS.
AT&T’s Bell laboratories released UNIX as a multiuser and multitasking , time sharing operating system in 1980 and also other companies upgraded it with different levels and versions. UNIX system V emerged as the major and popularly used operating system in the software world, for many years, in commercial, scientific and graphic applications for multiuser systems and is rapidly evolving as the standard operating system for open systems, graphic workstations and multiprocessor systems.
Once the operating system is installed in a normal PC, it resides in the boot sector of the hard disc. As soon as the power is switched on, the program in ROM enables the CPU to transfer the operating system software from the hard disc boot sector, to the main memory and displays a C:> on the monitor. The user can take control once the operating system is loaded.
In a multiuser system, the operating system is loaded from the hard disc to the main memory. Since the components of the operating system itself, and corresponding messages are displayed on the system console. Once it is fully loaded, the user terminals displays LOGIN as the prompt in each terminal, indicating that the system is ready for use.
HISTORY OF THE DEVELOPMENT OF OPERATING SYSTEMS:
Earlier, computers in the 50’s 60’s like IBM 1620, IBM 360, DEC systems etc., had very little memory- 48KB or 64KB, compared to what is available today like 500 GB, 1TB or more even in PCs. Earlier Operating systems were very primitive and occupied only limited space in the main memory. They could perform only certain limited tasks on their own, without depending on the computer.
Digital released in 1970. CP/M (Control Program Monitor) operating system for hoem computers, and later MP/m (Multi program Monitor) for a limited multiuser facility.
Microsoft released in the 80’s MS-DOS (Microsoft Disc Operating System) for IBM PCs, which became very popular and emerging as a standard with different versions and releases. Now Windows provides Graphic User Interface (GUI) for system usage embedding in itself, DOS.
AT&T’s Bell laboratories released UNIX as a multiuser and multitasking , time sharing operating system in 1980 and also other companies upgraded it with different levels and versions. UNIX system V emerged as the major and popularly used operating system in the software world, for many years, in commercial, scientific and graphic applications for multiuser systems and is rapidly evolving as the standard operating system for open systems, graphic workstations and multiprocessor systems.