According to this
ASCII chart[
^] (and all others, so far as I know):
The decimal value for the keycode of the
Return key is 13, or in hexadecimal D (&HD)
The decimal value for the keycode of the
Backspace key is 8, or in hexadecimal 8 (&H8)
The decimal value for the keycode of the
Space key is 32, or in hexadecimal 20 (&H20)
Need I continue?