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Implementing Protection with Virtual Memory - computer architecture:
To enable the operating system to implement protection in the VM system, the HW have to:
I. Support at least 2 modes that denoted whether the running process is a user process (executive process) or an operating system process (kernel/supervisor process).
II. Provide a part ion of the CPU state that a user process may read but not write (includes supervisor mode bit).
o Only operating system process may change page tables. Page tables are held in operating system address space thereby preventing a user procedure from changing them.
o When processes desire to share information in a restricted way, the OS have to assist them.
o The write access bit (in both the TLB and the page table) can be used to limit the sharing to only read sharing.
Explain at least one modulation technique used for high speed modems. FSK - Frequency Shift Keying: In such technique the frequency of the carrier signal is changed as per to
Convert (177.25) 10 to octal Ans. 177.25) 10 = ( ) 8 Firstly we take integer part Hence (177) 10 = (261) 8 Now as 0.25 x 8 = 2.00 and 0.00 x 8 = 0 Therefor
Define word length? Every group of n bits is referred to as a word of information and n is known as the word length.
Consider the following expression. Assume that complement inputs are available. F(A,B,C,D) = ∑m (0,1,3,5,9,12,14) + ∑d (4,10,15) 1. Find minimal expression for SOP. Draw gate ne
Communication by Message Passing You will agree that a single object alone is generally not very helpful. Objects usually emerge as components of a system or a larger program.
The code where all successive numbers differ from their preceding number by single bit is ? Ans. Gray Code, where all successive numbers are different from their preceding nu
What is the Role of Certifying Authority? A certificate authority is a body, that is either public or private, that seeks to fill the requirement for trusted third-party servic
Explain pointers We can have a pointer pointing to a structure just the same way a pointer pointing to an int, such pointers are called as structure pointers
Some of the fundamental considerations for instruction set design includes selection of: A set of data-types (For example: integers, long integers, doubles, character strin
Q. Show the layout of Dvorak-Dealey keyboard? This was one keyboard layout designed to be a challenger to QWERTY layout. This was designed by August Dvorak and William Dealey a
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