Called by 6DCD for the first key of a line only. If the key is one of the four cursor keys, this routine types a complete movement command on its own and ends the line, so that a single key press moves Bilbo. The key codes come from the keyboard tables at 7BEE and 7C16:

Key	Code	Command
7 (up)	$5B	N
6 (down)	$0A	S
8 (right)	$09	E
5 (left)	$08	W

The key works with or without CAPS SHIFT. The letter is stored in the input buffer and echoed, an ENTER ($0D) is stored after it, and the routine returns with A=$0D. The line editor then carries on as if the player had pressed ENTER: it prints the new line, stores a second (harmless) ENTER and finishes the line. So one key press both types and enters the command.

For any other key the routine returns with A unchanged and the line editor deals with the key as usual. The code for the left cursor ($08) is also the backspace code; this is why cursor-left only means 'west' as the first key of a line, and means 'delete' afterwards. Cursor right and down later in a line are simply ignored.