1.5 List the four steps that are necessary to run a porgram on a completely dedi

Question

1.5 List the four steps that are necessary to run a porgram on a completely dedicated machine- a computer that is runing only that program?

1.6 How does the distinction between kernal mode and user mode function as a rudimentary form of protection(security) system?

1.12 What are the main differences between operating system for mainframe computers and personal computers?

1.13 which of the following instructions should be privileged?

a. set value of timer

b. read the clock

c. clear memory

d. issue a trap instruction

e. turn off interrupts

f. modify entries in device-status table

g. switch from user to kernal mode

h. access I/O devices

Explanation / Answer

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1.5)
a. Reserve machine time.
b. Manually load program into memory.
c. Load starting address and begin execution.
d. Monitor and control execution of program from console.

1.6)

The distinction between kernel mode and user mode providesa rudimentary form of protection in the following manner. Certain instructions could be executed only when theCPUis in kernel mode. Similarly, hardware devices could be accessed only when the program is executing in kernel mode. Control over when interrupts could be enabled or diabled is also possible only when the CPU is in kernel mode. Consequently, the CPU has very limited capability when executing in user mode, thereby enforcing protection of critical resources.

i will only answer 2 questions even though i am suppose to answer only one

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