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Routines |
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Used by the routine at Drawing.
Moves the attribute address one row down. A high byte of 5A means the step passed the end of the attribute file.
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| AttributeDown | F525 | PUSH AF | Keep the colour and step the attribute address down one row. | |
| F526 | PUSH DE | |||
| F527 | LD DE,$0020 | |||
| F52A | ADD HL,DE | |||
| F52B | LD A,H | Leave the new row in place when it is still on screen, and fall through when it is not. | ||
| F52C | CP $5A | |||
| F52E | JR NZ,$F532 | |||
| F530 | AND A | Clear the carry before the row is stepped back. | ||
| F531 | SBC HL,DE | Step back one row (20) because the step left the attribute file. | ||
| F533 | POP DE | Restore the pen and the colour from the stack. | ||
| F534 | POP AF | |||
| F535 | RET | Return. | ||
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View the equivalent code in;
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| Prev: F514 | Up: Map | Next: F536 |