Page "Applesoft BASIC" Paragraph 27

* There was a well-documented bug in Applesoft BASIC that could actually crash the interpreter if ONERR GOTO was in effect and numerous program errors occurred.

Apple provided a short assembly-language routine which could be POKEd into RAM and CALLed to ameliorate the problem to an extent.

Later it was discovered by an enterprising hacker that the required code was actually in the Applesoft ROM ( though it was never executed ) and could be called there instead: CALL-3288 or ( equivalent ) 62248.