Unused
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B86C: Unused
These bytes are probably remnants of a location descriptor table.
Input
Output
B86C
DEFB $4C
B86D
DEFB $7A,$DC
y=33, z=2; left, right, up/right, down/left, down/right
B86F
DEFB $FF
End marker
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B867
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Map
Next:
B870