programma BACK
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just start it and answer on the question
PICTURE?  -> 0->9   chose the picture you want to the "background"
NEGATIVE? ->1 or 0  chose or you want to take the negative of the picture or not (1= yes 0=not)
ARCHIVE USED PIC -> 1 or 0   1 will archive the selected picture, 0 won't


programma NEG
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PICTURE? -> 0->10  0->10 will take the negative of a stored pic, 10 will take the negative from what's on the graph screen
ARCHIVE USED PIC? -> 1 or 0   1 will archive the stored pic you used by question 1 , 0 won't
SAVE NEW PIC? -> 1 or 0  1 to save the negative of the chosen pic from question 1, 0 for quit the program
TO? ->  0->9 when the previous question is 1, select in wich pic you want to save the negative of the chosen picture



BUGS

1) when you want to save the new pic in NEG, and the pic already excist, then your calculator will crash if the  excisting pic is archived!!

this is the only known bug

thanks for downloading