Int 03  - CPU-generated - Breakpoint                                       [C]

Desc:  generated by the one-byte breakpoint instruction (opcode CCh)

Notes: used by debuggers to implement breakpoints, such as MS-DOS DEBUG's G
     command
   also used by Turbo Pascal versions 1,2,3 when {$U+} specified
   return address points to byte following the breakpoint instruction

See Also: INT 01