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A928: perform IF
A928 20 9E AD JSR $AD9E evaluate expression
A92B 20 79 00 JSR $0079 scan memory
A92E C9 89 CMP #$89 compare with "GOTO" token
A930 F0 05 BEQ $A937 if it was the token for GOTO go do IF ... GOTO
wasn't IF ... GOTO so must be IF ... THEN
A932 A9 A7 LDA #$A7 set "THEN" token
A934 20 FF AE JSR $AEFF scan for CHR$(A), else do syntax error then warm start
A937 A5 61 LDA $61 get FAC1 exponent
A939 D0 05 BNE $A940 if result was non zero continue execution, else REM rest of line
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