v7 man page for abort

ABORT(3)						     Library Functions Manual							  ABORT(3)

NAME
       abort - generate IOT fault

DESCRIPTION
       Abort  executes	the  PDP11 IOT instruction.  This causes a signal that normally terminates the process with a core dump, which may be used
       for debugging.

SEE ALSO
       adb(1), signal(2), exit(2)

DIAGNOSTICS
       Usually `IOT trap - core dumped' from the shell.

																	  ABORT(3)