IBM Personal Computer XT Manual To Operations page 200

As with the zero and 0, the number 1 and the
lowercase letter L are not interchangeable.
[[
]
When pressed, the spacebar moves the cursor to the
right. Any character the cursor moves over is replaced
with a blank.
[[8J
The Alternate key helps you with easy entry of BASIC
statement keywords. When you press the Alt key and
any alphabetic key A through Z, one of the BASIC
keywords is entered. ASCII codes can also be entered
by using the Alt key and the numeric keypad. For more
information about the Alt key, see the BASIC
reference manual.
(Ell)
The Control key will perform a variety of functions.
These are described in your operating system manual or
application program manual.
3-8 Keyboard