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68B7: Scroll screen attributes up by one row
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This routine is called every 8 terrain fragments to scroll the screen attributes. It copies attribute data from one row to the next, effectively scrolling the attributes upward. It also handles special bridge attribute rendering.
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| scroll_attributes | 68B7 | LD HL,$5A1F | Copy 524 attribute bytes backward, scrolling all rows up by one. | |
| 68BA | LD DE,$5A3F | |||
| 68BD | LD BC,$020C | |||
| 68C0 | LDDR | |||
| 68C2 | LD HL,$5BDF | Point HL at the bottom attribute row. | ||
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