100  REM TRY
 110      ONERR  GOTO 160"CATCH
 120      PRINT 1E99
 130      POKE 216,0
 140      PRINT "NEVER REACHED."
 150      GOTO 200"END TRY
 160  REM CATCH
 170      POKE 216,0
 180      LET E =  PEEK (222)
 190      PRINT "ERROR "E" OCCURRED."
 200  REM END TRY