Answer the following statements true (T) or false (F)

1. On a traditional IBM mainframe, the new PSW holds the address of the CVT.
2. On a traditional IBM mainframe, when an interrupt occurs, hardware stores the current
program status word in the new PSW field and then loads the old PSW into the current
PSW register.
3. Traditional IBM mainframes recognize six different interrupt types.
4. On a traditional IBM mainframe, an external interrupt comes from the operator’s console,
another processor, or the timer.
5. On a traditional IBM mainframe, a supervisor call (SVC) interrupt is issued when a
program executes an illegal instruction.


1. F
2. F
3. T
4. T
5. F

Computer Science & Information Technology

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