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8068: Willy's pixel y-coordinate (x2)
Initialised by the routine at 8684, and used by the routines at 8ABB, 8BDD, 923A and 927F. Holds the LSB of the address of the entry in the screen buffer address lookup table at 8300 that corresponds to Willy's pixel y-coordinate; in practice, this is twice Willy's actual pixel y-coordinate.
Input
Output
8068 DEFB $00
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