Pdf 👇👇


 Setup time: a single program called job loads the compiler + convert the program written in the high level language into low level language each of these steps involve mounting and dismounting the tapes or card readers

Mounting: Attaching file system from root directories
Dismounting: removing file system from root directory

2) Simple batch operating system: earliest computer were very very expensive and wasted computer processing time so batch operating system was developed the central Idea behind developing the best kind of operating system is to use a piece of software called monitor

Monitor:
The central Idea behind developing which kind of operating system is to use a piece of software called monitor so, the user cannot access direct to the processor
• the user is to submit the job using input devices like card readers to the computer operating system

• when matches the job sequentially and places the entire jobs on the input devices which will be used by the monitor.

• batch operating system is constructed in such a way that control has to go back to the monitor at which point monitor automatically execute another job.

There are two types of views:-
1) Monitor point of view 
2) Processor point of view

1) Monitor point of view: Monitor control the sequence of events for doing this much of the monitor will always be in the main memory and available for execution

• The rest of the monitor controls  utilities and output functions that loaded as subroutines to the user program from the beginning of any job used by the monitor.

• Monitor gives the input using card readers or magnetic tapes.

• Monitor reads in job one at a time the current job will be placed in a user program area and the control is passed to the this job.

•When the job when the job is read completely the control is returned back to the monitor and output will be displayed to the printer