INT 03 - CPU-generated - BREAKPOINT
Desc:   generated by the one-byte breakpoint instruction (opcode CCh)
Notes:  used by debuggers to implement breakpoints, such as MSDOS 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: 01

03 - CPU-generated - BREAKPOINT