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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.
DeMorgan's first theorem shows the equivalence of which logic gate ? Ans. DeMorgan's first theorem depicts the equivalence of NOR gate and Bubbled AND gate. For De Morgan's
hidden edge/surface removal
A Scrollbar is a Component, but not a Container while Scrollpane is a Container and handles its own events and do its own scrolling.
Explain Time Switching. Time Switches: The principle of a time switch is demonstrated in figure. This connects an incoming n channel PCM highway to an outgoing n channel PC
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