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Routines |
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Used by the routines at DrawingSetup and Drawing_PlotTheSelectedPixel.
Retreats the high coordinate. When it was already zero, it is put back and one step is counted.
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| Drawing_RetreatTheHighCoordinate | 8148 | DEC D | Step the high coordinate back and return unless it wrapped to FF. | |
| 8149 | LD H,A | |||
| 814A | LD A,D | |||
| 814B | CP $FF | |||
| 814D | LD A,H | |||
| 814E | RET NZ | |||
| 814F | INC D | Put the high coordinate back to 00. | ||
| 8150 | RET | Return. | ||
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View the equivalent code in;
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