Irq 0 interrupt have priority
? low
? medium
? highest
? lowest

Highest

Explanation:

A interrupt request / IRQ is in which instructions are sent to Cpu and uses an interrupt handler to run distinct program . Hardware interrupts are used to manage occurrences such as obtaining modem or network card information, important presses, or mouse motions.

Interrupt request 0. – it is a system timer (can not be altered) Interrupt request 1 – keyboard controller (can not be changed) Interrupt request 2 – cascaded IRQ 8–15 signals (any device configured to use IRQ 2 will genuinely use IRQ 9) Interrupt request 3 – serial port 2 controller Interrupt request 4 –  serial port 1 controller Interrupt request 5 –parallel port 2 and 3  Interrupt request 6 - floppy disk controller  Interrupt request 7 –parallel port 1. If a printer is not present, it is used for printers or for any parallel port. It can also possibly be shared with a secondary sound card with cautious port management.

As interrupt number increases priority level decreases, Priority level 0 is the highest priority level .

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