More Background* then some of the real stuff..
... Here we have a table of base and limit values Application references some address x CPU breaks this into a page number and an offset (or a segment number and offset) (More common) Pages have fixed size, usually 512 bytes (Now rare) Segments: variable size up to some maximum Looks up the ...
... Here we have a table of base and limit values Application references some address x CPU breaks this into a page number and an offset (or a segment number and offset) (More common) Pages have fixed size, usually 512 bytes (Now rare) Segments: variable size up to some maximum Looks up the ...
Lesson 8
... • A keyboard-based editor (emacs is another) • Uses the keyboard to specify commands and receive user input • Certain keys perform certain functions • Delete, insert, cursor movement, save, quit ...
... • A keyboard-based editor (emacs is another) • Uses the keyboard to specify commands and receive user input • Certain keys perform certain functions • Delete, insert, cursor movement, save, quit ...
What is Linux? - Longwood Blogs
... This desktop has similar features to other operating systems. One feature sets it apart, and that is the ability to have access to a terminal window. ...
... This desktop has similar features to other operating systems. One feature sets it apart, and that is the ability to have access to a terminal window. ...
CUSTOMER_CODE SMUDE DIVISION_CODE SMUDE
... The I/O controllers and main memory are connected to the main system bus. The cache memory (usually found on-chip with the CPU) has a direct connection to the processor, as well as to the system bus. The I/O devices shown here are not connected directly to the system bus; they interface with another ...
... The I/O controllers and main memory are connected to the main system bus. The cache memory (usually found on-chip with the CPU) has a direct connection to the processor, as well as to the system bus. The I/O devices shown here are not connected directly to the system bus; they interface with another ...
File
... I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing eithe ...
... I/O operations – since user programs cannot execute I/O operations directly, the operating system must provide some means to perform I/O. File-system manipulation – program capability to read, write, create, and delete files. Communications – exchange of information between processes executing eithe ...
Operating Systems
... • CPU (decides how to share CPU among processes) •Memory (decides how to share memory) •Disk (decides how to share disk) ...
... • CPU (decides how to share CPU among processes) •Memory (decides how to share memory) •Disk (decides how to share disk) ...
Operating Systems
... • Your home directory is where you are located when you log in (e.g., /afs/umbc.edu/users/j/d/jdoe28). • The current directory is where you are located at any time while you are using the system. • Files within the same directory must be given unique names. • Paths allow us to give the same name to ...
... • Your home directory is where you are located when you log in (e.g., /afs/umbc.edu/users/j/d/jdoe28). • The current directory is where you are located at any time while you are using the system. • Files within the same directory must be given unique names. • Paths allow us to give the same name to ...
Operating Systems Hardware Support
... Homework 6 : In a MIPS based computer, assume that the operating system loads: − the floating point exceptions handling software routine starting at the memory address 81000014hex, − the illegal op-code exception handling software routine starting at the memory address 82000028hex, − the software ro ...
... Homework 6 : In a MIPS based computer, assume that the operating system loads: − the floating point exceptions handling software routine starting at the memory address 81000014hex, − the illegal op-code exception handling software routine starting at the memory address 82000028hex, − the software ro ...
OPERATING SYSTEMS 2015-16 1 OPERATING SYSTEM
... Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing Response time should be < 1 second Each user has at least one program executing in memory [process If several jobs ...
... Timesharing (multitasking) is logical extension in which CPU switches jobs so frequently that users can interact with each job while it is running, creating interactive computing Response time should be < 1 second Each user has at least one program executing in memory [process If several jobs ...
Lecture 1 Operating System Overview
... resources are used to solve the computing problems of the users ...
... resources are used to solve the computing problems of the users ...
Operating Systems
... runs most services - like networking, filesystem, etc. - in user space. microkernels can be more stable, but require additional design work. ...
... runs most services - like networking, filesystem, etc. - in user space. microkernels can be more stable, but require additional design work. ...
Operating Systems - Bina – Advanced Software Services
... DOS 2.0 in 1983, supported a hard disk, one directory, max 64 files DOS 3.0 ran on Intel’s 286 processor, memory protection features and hard disk DOS 3.1, 1984, supported networking DOS 3.3, 1987, supported 386 processor Windows 3.0, 1990, PC Graphical User Interface (GUI) for the 1st time Introduc ...
... DOS 2.0 in 1983, supported a hard disk, one directory, max 64 files DOS 3.0 ran on Intel’s 286 processor, memory protection features and hard disk DOS 3.1, 1984, supported networking DOS 3.3, 1987, supported 386 processor Windows 3.0, 1990, PC Graphical User Interface (GUI) for the 1st time Introduc ...
Operating System Basics - Computer Sciences User Pages
... • After each instruction executes, CPU checks to see if interrupt pin has been raised • If so, the following occurs: 1) sets the system into kernel mode (if not already there) 2) determine interrupt number (from PIC or instruction) 3) read appropriate interrupt table entry - special register contain ...
... • After each instruction executes, CPU checks to see if interrupt pin has been raised • If so, the following occurs: 1) sets the system into kernel mode (if not already there) 2) determine interrupt number (from PIC or instruction) 3) read appropriate interrupt table entry - special register contain ...
Lect0698
... operating system does the function call, and returns any data necessary in a register. Let us explain it in more detail by use of an example. Character Input There are many types of input that a program may expect (character, string, file, etc.) but for the moment we will look at the simplest one, i ...
... operating system does the function call, and returns any data necessary in a register. Let us explain it in more detail by use of an example. Character Input There are many types of input that a program may expect (character, string, file, etc.) but for the moment we will look at the simplest one, i ...
Exception Handling and System Calls
... space. Next, it sets the currentThread's address space pointer (look back in thread.h and thread.cc; when USERPROG is defined, as it is for this assignment, the thread class has an additional field -- namely a pointer to an address space. Whereas in assignment one the threads only executed in the ke ...
... space. Next, it sets the currentThread's address space pointer (look back in thread.h and thread.cc; when USERPROG is defined, as it is for this assignment, the thread class has an additional field -- namely a pointer to an address space. Whereas in assignment one the threads only executed in the ke ...
operating systems
... expect program to compile and run on any system that supports the same API. Actual system calls can be more detailed and difficult to work with than the API available to an application programmer. The run time support system ( a set of functions built into libraries included with a compiler) for m ...
... expect program to compile and run on any system that supports the same API. Actual system calls can be more detailed and difficult to work with than the API available to an application programmer. The run time support system ( a set of functions built into libraries included with a compiler) for m ...
continued…
... OS receives command to execute the application OS locates the program file for the application OS loads the program file into memory OS gives control to the program Program requests memory addresses from OS for its data Program initializes itself; possibly requests that data from secondary storage b ...
... OS receives command to execute the application OS locates the program file for the application OS loads the program file into memory OS gives control to the program Program requests memory addresses from OS for its data Program initializes itself; possibly requests that data from secondary storage b ...
Chapter 2 Operating System Overview
... a program in execution an instance of a running program the entity that can be assigned to, and executed on, a processor a unit of activity characterized by a single sequential thread of execution, a current state, and an associated set of system resources ...
... a program in execution an instance of a running program the entity that can be assigned to, and executed on, a processor a unit of activity characterized by a single sequential thread of execution, a current state, and an associated set of system resources ...
Operating System Overview
... User level vs. Kernel level • Kernel (a.k.a. supervisory or privileged) level • All instructions are available • Total control possible so OS must say “Mine, all mine” (Daffy Duck) ...
... User level vs. Kernel level • Kernel (a.k.a. supervisory or privileged) level • All instructions are available • Total control possible so OS must say “Mine, all mine” (Daffy Duck) ...
Chapter 3: Operating-System Structures • System Components
... provided to the user with the O.S. – Program loading and execution: After a program is assembled or compiled, it must be loaded into memory to be executed. The system may provide loaders, linkage editors and debuggers. – Communications: Programs provide mechanism for creating virtual connections amo ...
... provided to the user with the O.S. – Program loading and execution: After a program is assembled or compiled, it must be loaded into memory to be executed. The system may provide loaders, linkage editors and debuggers. – Communications: Programs provide mechanism for creating virtual connections amo ...
Lecture 6
... • Programming interface to the services provided by the OS • Typically written in a high-level language (C or C++) • Mostly accessed by programs via a high-level Application Programming Interface (API) rather than direct system call use • Three most common APIs are Win32 API for Windows, POSIX API f ...
... • Programming interface to the services provided by the OS • Typically written in a high-level language (C or C++) • Mostly accessed by programs via a high-level Application Programming Interface (API) rather than direct system call use • Three most common APIs are Win32 API for Windows, POSIX API f ...
Operating system organization - cs.rochester.edu
... After I/O starts, control returns to user program without waiting for I/O completion. Device controller later informs CPU that it has finished its operation by causing an interrupt. When an interrupt occur, current execution is put on hold; the CPU jumps to a service routine called “interrupt handle ...
... After I/O starts, control returns to user program without waiting for I/O completion. Device controller later informs CPU that it has finished its operation by causing an interrupt. When an interrupt occur, current execution is put on hold; the CPU jumps to a service routine called “interrupt handle ...
1. Which of the following does not support more than one program at
... Technique of using disk space to make programs believe ...
... Technique of using disk space to make programs believe ...
Acorn MOS
Acorn's Machine Operating System (MOS) or OS was a computer operating system used in the Acorn BBC computer range. It included support for four-channel sound and graphics, file system abstraction, and digital and analogue I/O including a daisy-chained fast expansion bus. The implementation was single-tasking, monolithic and non-reentrant.Versions 0.10 to 1.20 were used on the BBC Micro, version 1.00 on the Electron, version 2 was used on the B+, and versions 3 to 5 were used in the BBC Master Series range.The final BBC computer, the BBC A3000, was 32-bit and ran RISC OS. Its operating system used portions of the Acorn MOS architecture and shared a number of characteristics (commands, VDU system) with the earlier 8-bit MOS.Versions 0 and 1 of the MOS were 16KiB in size, written in 6502 machine code, and held in ROM on the motherboard. The upper quarter of the 16-bit address space (0xC000 to 0xFFFF) is reserved for its ROM code and I/O space.Versions 2 to 5 were still restricted to a 16KiB address space but managed to hold more code and hence more complex routines, partly because of the alternative 65C102 CPU with its denser instruction set plus the careful use of paging.