Data
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33800: Left-right movement table
 Used by the routine at 35805. The entries in this table are used to map the existing value (V) of Willy's direction and movement flags at 32874 to a new value (V'), depending on the direction Willy is facing and how he is moving or being moved (by 'left' and 'right' keypresses and joystick input, or by a conveyor). One of the first four entries is used when Willy is not moving. 33800 DEFB 0 V=0 (facing right, no movement) + no movement: V'=0 (no change) 33801 DEFB 1 V=1 (facing left, no movement) + no movement: V'=1 (no change) 33802 DEFB 0 V=2 (facing right, moving) + no movement: V'=0 (facing right, no movement) (i.e. stop) 33803 DEFB 1 V=3 (facing left, moving) + no movement: V'=1 (facing left, no movement) (i.e. stop) One of the next four entries is used when Willy is moving left. 33804 DEFB 1 V=0 (facing right, no movement) + move left: V'=1 (facing left, no movement) (i.e. turn around) 33805 DEFB 3 V=1 (facing left, no movement) + move left: V'=3 (facing left, moving) 33806 DEFB 1 V=2 (facing right, moving) + move left: V'=1 (facing left, no movement) (i.e. turn around) 33807 DEFB 3 V=3 (facing left, moving) + move left: V'=3 (no change) One of the next four entries is used when Willy is moving right. 33808 DEFB 2 V=0 (facing right, no movement) + move right: V'=2 (facing right, moving) 33809 DEFB 0 V=1 (facing left, no movement) + move right: V'=0 (facing right, no movement) (i.e. turn around) 33810 DEFB 2 V=2 (facing right, moving) + move right: V'=2 (no change) 33811 DEFB 0 V=3 (facing left, moving) + move right: V'=0 (facing right, no movement) (i.e. turn around) One of the final four entries is used when Willy is being pulled both left and right; each entry leaves the flags at 32874 unchanged (so Willy carries on moving in the direction he's already moving, or remains stationary). 33812 DEFB 0 V=V'=0 (facing right, no movement) 33813 DEFB 1 V=V'=1 (facing left, no movement) 33814 DEFB 2 V=V'=2 (facing right, moving) 33815 DEFB 3 V=V'=3 (facing left, moving)
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