| The Hobbit (v1.0) | Routines |
| Prev: 8B09 | Up: Map | Next: 8B1F |
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Decreases E, unless it would go below 0. Returns with Z set at the edge.
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| 8B18 | DEC E | y one lower | ||
| 8B19 | BIT 7,E | Did that go below 0, off the bottom of the picture area? | ||
| 8B1B | JR Z,$8B13 | No: continue at the shared ending (reused from 8B09) | ||
| 8B1D | INC E | Yes: undo the move | ||
| 8B1E | RET | Z stays set, telling the caller the edge was reached | ||
| Prev: 8B09 | Up: Map | Next: 8B1F |