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Routines |
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Scan the six alien slots at Alien_Slot_1 and return the first unused one.
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Scan the six alien slots and return the first free one.
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| FindSlotAlien | 9395 | LD HL,$61B0 | HL=Alien_Slot_1. | |||||||||
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There are a maximum of 6 aliens on screen at a time.
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| 9398 | LD B,$06 | Set an alien slot counter in B for 06 loops. | ||||||||||
| 939A | LD DE,$0018 | DE=0018 (the length of each slot). | ||||||||||
| FindSlotAlien_Loop | 939D | LD A,(HL) | Jump to FindSlotAlien_Return if this slot is unused. | |||||||||
| 939E | AND A | |||||||||||
| 939F | JR Z,FindSlotAlien_Return | |||||||||||
| 93A1 | ADD HL,DE | Move onto the next slot. | ||||||||||
| 93A2 | DJNZ FindSlotAlien_Loop | Decrease the alien counter by one and loop back to FindSlotAlien_Loop until every slot has been checked. | ||||||||||
| 93A4 | AND A | Leave the Z flag unset as no free slot was found. | ||||||||||
| FindSlotAlien_Return | 93A5 | RET | Return. | |||||||||
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