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Used by the routine at 8ED4. The entries in this table are used to map the existing value (V) of Willy's direction and movement flags at 85D0 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, or by an urge to visit the toilet).
One of the first four entries is used when Willy is not moving.
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| 8421 | DEFB $00 | V=0 (facing right, no movement) + no movement: V'=0 (no change) | ||
| 8422 | DEFB $01 | V=1 (facing left, no movement) + no movement: V'=1 (no change) | ||
| 8423 | DEFB $00 | V=2 (facing right, moving) + no movement: V'=0 (facing right, no movement) (i.e. stop) | ||
| 8424 | DEFB $01 | V=3 (facing left, moving) + no movement: V'=1 (facing left, no movement) (i.e. stop) | ||
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One of the next four entries is used when Willy is moving left.
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| 8425 | DEFB $01 | V=0 (facing right, no movement) + move left: V'=1 (facing left, no movement) (i.e. turn around) | ||
| 8426 | DEFB $03 | V=1 (facing left, no movement) + move left: V'=3 (facing left, moving) | ||
| 8427 | DEFB $01 | V=2 (facing right, moving) + move left: V'=1 (facing left, no movement) (i.e. turn around) | ||
| 8428 | DEFB $03 | V=3 (facing left, moving) + move left: V'=3 (no change) | ||
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One of the next four entries is used when Willy is moving right.
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| 8429 | DEFB $02 | V=0 (facing right, no movement) + move right: V'=2 (facing right, moving) | ||
| 842A | DEFB $00 | V=1 (facing left, no movement) + move right: V'=0 (facing right, no movement) (i.e. turn around) | ||
| 842B | DEFB $02 | V=2 (facing right, moving) + move right: V'=2 (no change) | ||
| 842C | DEFB $00 | V=3 (facing left, moving) + move right: V'=0 (facing right, no movement) (i.e. turn around) | ||
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One of the final four entries is used when Willy is being pulled both left and right; each entry leaves the flags at 85D0 unchanged (so Willy carries on moving in the direction he's already moving, or remains stationary).
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| 842D | DEFB $00 | V=V'=0 (facing right, no movement) | ||
| 842E | DEFB $01 | V=V'=1 (facing left, no movement) | ||
| 842F | DEFB $02 | V=V'=2 (facing right, moving) | ||
| 8430 | DEFB $03 | V=V'=3 (facing left, moving) | ||
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