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Routines |
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Used by the routines at DrawingSetup and Drawing_PlotTheSelectedPixel.
Retreats the low coordinate. If that sets bit 7, the coordinate is put back and one step is counted.
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| Drawing_RetreatTheLowCoordinate | 813A | DEC E | Step the low coordinate back and jump to Drawing_AdvanceTheLowCoordinate_StoreTheCoordinate if bit 7 is clear. | |
| 813B | BIT 7,E | |||
| 813D | JR Z,Drawing_AdvanceTheLowCoordinate_StoreTheCoordinate | |||
| 813F | INC E | Put the low coordinate back. | ||
| 8140 | RET | Return. | ||
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View the equivalent code in;
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