QMCS 360
Class Notes # 4
Dr. Rick Smith
Quantitative Methods
and
Computer Science
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last update:
Tuesday, September 27, 2005
Quiz
Questions about upcoming homework assignments
Loading programs
Cacheing, from Chapter 1 appendix
Interrupts vs Traps
Both cause same result
Suspend current program
Enter kernel mode
Start another program by following a vector
Interrupt is caused by hardware
Trap is caused by software
A 'controlled' way to go from user mode to kernel mode