I have just brought a Lathe build in 1999 and it has aa Fanuc 21 T controller, my question is what would the file extensions being as I am confused. Is it "nc1" or "nc0" or something different.

I have tried to run one of the example given in the manual on the program Cutviwer but it doesn't make the tapper as the diagram shows.
Here is the code.

N010 G50 X220.0 Z190.0 ;
N011 G00 X176.0 Z132.0 ;
N012 G72 W7.0 R1.0 ;
N013 G72 P014 Q019 U4.0 W2.0 F0.3 S550 ;
N014 G00 Z58.0 S700 ;
N015 G01 X120.0 V12.0 F0.15 ;
N016 W10.0 ;
N017 X80.0 W10.0 ;
N018 W20.0 ;
N019 X36.0 W22.0 ;
N020 G70 P014 Q019 ;


The sloping line from x40 z160 to x50 z120 doesn't end up sloping just straight.