10 A(9)=500
20 POKE2,500:REM ILLEGAL QUANTITY
30 POKE70000,5:REM ILLEGAL QUANTITY
40 POKE70000,5:REM ILLEGAL QUANTITY
50 PRINTCHR$(500):REM ILLEGAL QUANTITY
60 PRINT1/0:REM DIVISION BY ZERO
70 DIMA(100):DIMA(200):REM REDIM'D AR.
80 NEXTI:REM NEXT WITHOUT FOR
90 RETURN:REM RETURN WITHOUT GOSUB
100 A=1E100:REM OVERFLOW
110 SYNTAX:REM SYNTAX
120 GOTO0:REM UNDEF'D STATEMENT
130 GOSUB0:REM UNDEF'D STATEMENT
140 READA:REM OUT OF DATA
150 A$=5:REM TYPE MISMATCH
160 A="TEXT":REM TYPE MISMATCH
170 PRINTFN A(8):REM UNDEF'D FUNCTION
180 PRINT#1:REM FILE NOT OPEN