Question

when a program initiates an i/o operation and interrupt occurs, what is the name of the interrupt?

Answer 1

We got the fllowing interrupts during when a program initiates an i/o operation

1) level-O interrupt.

Either one of two conditions can cause level-0 interrupt to occur:

The card reader (1442) has a data word ready for storing into core storage during a read operation.

Or the card punch (1442) is ready to accept data for punching a column during a punch operation.

2) level-1 interrupt,:

the interrupt must be for the synchronous communications adapter because that is the only other device that can cause an interrupt at level 1.

3)level-5 interrupts is different from normal interrupt programming. The major difference for level 5 is the reset function in the sense-device-status-word command.

Program stop. The execute I/O and sense DSW sequence is then performed to determine what caused the interrupt.

Interrupt Run Mode,The execute I/O and sense DSW sequence is then performed to determine what caused the interrupt. The branch-out at the end of the routine (a BOSC) resets level-5 interrupt request and level-5 priority.

Finally we say that Interrupts at level 5 do not occur during other interrupt service routines. Therefore, interrupt routines cannot be traced.