IBM Personal Computer XT Manual To Operations page 205

The function of the Home key is defined by your
operating system or application program. See the
appropriate manual for a description.
End moves the cursor one position to the right of the
last character on the line.
Page Up is defined by your operating system or
application program. See the appropriate manual for a
description.
Page Down also is defined by your operating system or
application program manual. See the appropriate
manual for a description.
Keyboard 3-13