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Routines |
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Used by the routines at DrawingFill and DrawingLine.
Moves the pen one pixel down the screen. When E would wrap through FF (below the bottom row) the pen stays put and the zero flag is set.
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| StepPenDown | F555 | DEC E | Move the pen down and return when it is still on screen. | |
| F556 | LD H,A | |||
| F557 | LD A,E | |||
| F558 | CP $FF | |||
| F55A | LD A,H | |||
| F55B | RET NZ | |||
| F55C | INC E | The pen passed the bottom row, so step back. | ||
| F55D | RET | Return. | ||
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View the equivalent code in;
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