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Routines |
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Used by the routines at FLOOD_FILL and DRAW_LINE.
Same test and the same shared tail as INC_Y: DEC E to $FF also shows up in bit 7.
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| DEC_Y | 813A | DEC E | Down one; still 0-127? | |
| 813B | BIT 7,E | |||
| 813D | JR Z,Y_MOVED | |||
| 813F | INC E | No: undo it | ||
| 8140 | RET | |||
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