TIB: Invalid instruction?


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TIB: Invalid instruction?




I have a TI-86 calculator - v 1.3.  An instruction to erase lines is in the 
user manual.

To enter a line, one might type: line(3,12,15,12)
To erase a line, you're supposed to be able to put: line(3,12,15,12,0)
((The zero is there to tell the calc to erase the line.))

I cannot get this function to work.  Could it be my calc, or is this feature 
only on a different version, maybe?

Believe me, I typed it in correct to begin with (about a dozen times).

I'd appreciate it if someone could shed some light on this.

-Echo


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