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What does it mean to enable interrupt 19 capture. The help text for this option reads: enable to allow the option ROMs to trap the interrupt 19.

Semi relevant: Asus WS motherboard (intel z97).

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This is used by certain devices to intercept the normal boot process.

INT 19h (see Wikipedia) is a low-level system command normally used just after POST to boot the operating system. In typical end-user configurations outside of a business environment this setting may be ignored as it likely has no effect on your system.

Peripheral devices providing option ROMs such as network interface cards (PXE) or RAID storage controllers may intercept this command to run code that is required to set up the boot media (e.g RAID) before handing it over to the OS.

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  • But still, one main question or THE main question for me about this remains just unanswered (to say: "Enable/Disable" is sure clear but as I know this setting from my current and previous boards, it's description/options are different: "BIOS reaction on INT19 trapping by Option ROM: IMMEDIATE - execute the trap right away; POSTPONED - execute the trap during legacy boot"): So, what does changing this setting result here in the end? I mean, the description is not bad and it exactly tells what it does. But I have no idea what this means to me, what happens/changes, what's the effect finally?!?
    – Silvan Hofer
    Sep 16, 2019 at 5:46

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