Sage-Tips

What is vectored and non-vectored interrupts?

Vectored Interrupts are those which have fixed vector address (starting address of sub-routine) and after executing these, program control is transferred to that address. Non-Vectored Interrupts (Scalar Interrupt) are those in which vector address is not predefined.

Which one of the following types of interrupts can be caused by executing an instruction?

Normal Interrupts: the interrupts which are caused by the software instructions are called software instructions. Exception: unplanned interrupts while executing a program is called Exception. For example: while executing a program if we got a value which should be divided by zero is called a exception.

What are the steps followed whenever a software interrupt instruction INT executes?

INTR

1. First completes the current instruction.
2. Activates INTA output and receives the interrupt type, say X.
3. Flag register value, CS value of the return address and IP value of the return address are pushed on to the stack.
4. IP value is loaded from the contents of word location X × 4.

What is vectored interrupt in operating system?

In a computer, a vectored interrupt is an I/O interrupt that tells the part of the computer that handles I/O interrupts at the hardware level that a request for attention from an I/O device has been received and and also identifies the device that sent the request.

What is a non-vectored interrupt?

Non-Vectored Interrupts are those in which vector address is not predefined. The interrupting device gives the address of sub-routine for these interrupts. INTR is the only non-vectored interrupt in 8085 microprocessor.

What is maskable and non maskable interrupts?

1. Maskable interrupt is a hardware Interrupt that can be disabled or ignored by the instructions of CPU. A non-maskable interrupt is a hardware interrupt that cannot be disabled or ignored by the instructions of CPU.

What are the software interrupts?

A software interrupt often occurs when an application software terminates or when it requests the operating system for some service. This is quite unlike a hardware interrupt, which occurs at the hardware level.

What is maskable and non-maskable interrupt?

Which one of the following is a software vectored interrupt?

Here TRAP, INTR, RST 7.5 are vectored interrupts.

Which is non maskable interrupt?

In computing, a non-maskable interrupt (NMI) is a hardware interrupt that standard interrupt-masking techniques in the system cannot ignore. Such uses include reporting non-recoverable hardware errors, system debugging and profiling, and handling of special cases like system resets.