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Routines |
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Updates an entity of the type 05. When it is in frame 01 the low nibble of field 23 counts down, and when that runs out the entity is freed.
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| UpdatePuffEntity | 9E17 | LD A,(IX+$01) | Fetch the frame of the entity. | |||||
| 9E1A | AND %00001111 | Use bits 0-3. | ||||||
| 9E1C | DEC A | Subtract one. | ||||||
| 9E1D | JR NZ,UpdatePuffEntity_Test | Jump to UpdatePuffEntity_Test unless it is frame 01. | ||||||
| 9E1F | LD (IX+$10),A | Set the speed to 00. | ||||||
| 9E22 | LD A,(IX+$23) | Read field 23 of the entity. | ||||||
| 9E25 | LD B,A | Keep it in B. | ||||||
| 9E26 | AND %00001111 | Keep the low nibble. | ||||||
| 9E28 | SUB $01 | Subtract one. | ||||||
| 9E2A | JR C,FreeEntity | Jump to FreeEntity if it was zero. | ||||||
| 9E2C | LD C,A | Keep the new count in C. | ||||||
| 9E2D | LD A,B | Read field 23 of the entity. | ||||||
| 9E2E | AND %11110000 | Keep the high nibble. | ||||||
| 9E30 | OR C | Combine it with the new count. | ||||||
| 9E31 | LD (IX+$23),A | Store it in field 23 of the entity. | ||||||
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This entry point is used by the routine at UpdateShotEntity.
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| UpdatePuffEntity_Test | 9E34 | BIT 7,(IX+$01) | Jump to UpdateEntity if bit 7 of the frame of the entity is not set. | |||||
| 9E38 | JP Z,UpdateEntity | |||||||
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This entry point is used by the routine at UpdateDomeEntity.
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| FreeEntity | 9E3B | LD (IX+$00),$00 | Set the type of the entity to 00 to free it. | |||||
| 9E3F | SET 7,(IX+$01) | Set bit 7 of the frame of the entity, to hide it. | ||||||
| 9E43 | JP UpdateEntity_Done | Jump to UpdateEntity_Done. | ||||||
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