Will be one of:

• Wally data.
• Wilma data.
• Tom data.
• Dick data.
• Harry data.

Holds the control method.

Byte	Option
0	Keyboard
1	Kempston Joystick
2	Sinclair Joystick

This is 0 until a digit has been written. It's used to suppress writing leading 0's so the output is "£ 10" instead of "£010".

Initialised to 30 at 47789 and the countdown is made by Redraw_Banner_Underline.