X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 1b

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INT 1B - CTRL-BREAK KEY
   This interrupt is called when the keyboard scanner of the IBM
   machines detects CTRL and BREAK pressed at the same time. It
   normally points to a short routine in DOS which sets the
   Ctrl-C flag, thus invoking INT 23h the next time DOS checks
   for Ctrl-C.
SeeAlso: INT 23

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