Interrupts Maskable and non maskable What are they and what

Interrupts.... Maskable and non maskable. What are they and what are they used for in an OS? (Dr I need help 10/28 10am-11am Eastern time U. S. A, It\' s ok for you? please let me know)

Solution

Maskable Interrupts:

The interrupts whose request may be denied by microprocessor is called Maskable Interrupts. It can be suppressed by software or code. These interrupts can be ignored while using standard interrupt masking techniques.

These interrupts are disabled by the CPU instructions even if the interrupts come.

Examples of maskable interrupts are RST6.5, RST7.5, RST5.5 of 8085.

Non maskable Interrupts:

The interrupts whose request cannot be denied are called non maskable interrupts. They cannot be ignored by the CPU instructions. So critical hardware failure and system reset are attached to these interrupts.

Examples of non maskable interrupts are TRAP of 8085.

Interrupts are used to transfer information to and from the processor to different parts of PC. Interrupts are used to handle information transfers so to allow device request them when they need its attention. Interrupts uses a priority level to to decide which request to handle first.