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Routines |
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| FindSlotAlien | 37781 | LD HL,25008 | HL=Alien_States. | |||||||||
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There are a maximum of 6 aliens on screen at a time.
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| 37784 | LD B,6 | B=6 (alien counter). | ||||||||||
| 37786 | LD DE,24 | DE=0024 (the length of each slot). | ||||||||||
| FindSlotAlien_Loop | 37789 | LD A,(HL) | A=HL. | |||||||||
| 37790 | AND A | Jump to FindSlotAlien_Return if A is zero. | ||||||||||
| 37791 | JR Z,FindSlotAlien_Return | |||||||||||
| 37793 | ADD HL,DE | HL=HL+DE. | ||||||||||
| 37794 | DJNZ FindSlotAlien_Loop | Decrease alien slot counter by one and loop back to FindSlotAlien_Loop until counter is zero. | ||||||||||
| 37796 | AND A | If no available slot was found, ensure the Z flag is unset (so NZ is true). | ||||||||||
| FindSlotAlien_Return | 37797 | RET | Return. | |||||||||
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