IBM Personal Computer XT Manual To Operations page 199

When the Print Screen key is pressed along with the
Shift key, a copy of the screen presentation is printed.
If the information on the screen is alpha/numeric
characters, as in a program listing, a duplicate of the
information is printed. If the information is a graphic
representation, it can be reproduced only on a printer
that supports graphic printing, such as the IBM
Graphics Printer.
[ltJl]
The Backspace key moves the cursor one position to
the left. The character to the left of the cursor is
erased.
When entering data into your computer, be aware that
the number zero (,0) and the letter 0 are not
interchangeable.
Keyboard 3-7