IBM 5155 Manual To Operations page 198

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The Backspace key, when pressed, erases the character
at the cursor position and moves the cursor one position
to the left.
When typing data on your computer, you should be
aware that the number 0 and the letter
°
are not
interchangeable.
As with the zero and the 0, the number 1 and the
lowercase L are not interchangeable.
3-10 Keyboard