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Routines |
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Used by the routines at DrawingSetup and Drawing_PlotTheSelectedPixel.
Advances the high coordinate. When it wraps from 255, it is put back and the routine returns zero.
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| Drawing_AdvanceTheHighCoordinate | 33089 | INC D | Step the high coordinate on and return unless it wrapped to zero. | |
| 33090 | RET NZ | |||
| 33091 | DEC D | Put the high coordinate back to 255. | ||
| 33092 | LD H,A | Keep A in H. | ||
| 33093 | XOR A | Set the zero flag. | ||
| 33094 | LD A,H | Bring A back from H. | ||
| 33095 | RET | Return. | ||
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