Used by the routine at UPDATE_KNIGHT.

Called once a turn by the knight's controls (UPDATE_KNIGHT). Reads the keyboard or a joystick, by the method in bits 1-2 of CONTROL, into one byte, CONTROLS: bit 0 left, 1 right, 2 up, 3 fire, 4 down, 5 turn the town round -- what each does is the knight's controls' business (UPDATE_KNIGHT). Bits 6 and 7 are never set.

The keyboard: X, V, B and M left, C and N right; the whole of the A-G and H-ENTER rows up; the whole of the Q-T and Y-P rows fire; any number key down. The bottom row is not alternate keys, as Pentagram's is (Z, C, M and B one way, X, V, SYMBOL SHIFT and N the other): here Z and SYMBOL SHIFT are the key that turns the town round, and of the rest X, V, B and M turn one way and C and N the other.

A joystick: the Kempston stick from port 31; the cursor keys, 5 left, 8 right, 7 up, 6 down and 0 fire; Interface II, the 6-0 keys for one stick (6 left, 7 right, 8 down, 9 up, 0 fire) and 1-5 for the other, read together. With any method, Z or SYMBOL SHIFT sets bit 5 (half-rows $7F and $FE read together: bit 1 is either). SPACE and CAPS SHIFT do nothing here: PAUSE reads them for the pause.

Measured in the simulator, a key or a stick direction at a time for each method: every key and direction sets the bits above and nothing else.