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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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.