For "irq" (interrupt Request) we have a term and definition in Music Technology.

"Irq" (Interrupt Request) (Music Technology)

An Interrupt Request is a message, usually sent from a hardware device within/ connected to your computer (eg Hard Disk, printer etc) via a dedicated line to the Central Processing Unit (CPU) of your system. In modern "plug and play" systems each dedicated IRQ line is automatically assigned a number, however in older systems this had to be set manually by the user. IBM standard PC's have a maximum of 15 IRQ lines, which work on a priority basis, depending on the relative importance of the Interrupt. so that an Interrupt Request with a high priority may interrupt one with a lower priority, and one with a very high priority may override both of them! For reference, heres a list (below) of the standard IRQ configuration for a PC standard computer.
00) - System Timer . . . 01) - Keyboard . . . 02) - Cascade Controller / 2nd PIC . . . 03) - COM's 2 & 4 . . . 04) - COM's 1 & 4 . . . 05) - Sound / Parallel Port 2 . . . 06) - Floppy Disk . . . 07) - Parallel Port 1 . . . 08) - Real Time Clock . . . 09) - Redirected IRQ2 / Network Available / Open . . . 10) - Open . . . 11) - SCSI / Video / Open . . . 12) - PS2 / Open . . . 13) - Co Processor . . . 14) - Primary Hard Disk (Master) / Hard Disk Controller / Open . . . 15) - Secondary Hard Disk (Slave) / Open .
It should be noted that IRQ's 00, 01, 02, 08 and 13 Should always remain static, and never be removed or shared with any other devices, whereas the others may possibly be reconfigured or removed.

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