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Routines |
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Used by the routine at SpawnBonusItem.
Updates the bonus item. It sits in a cubby hole and flashes, and when Robbie touches it the cubby hole is changed (see Robbie_EmptyHanded_Pickup) and so the bonus item is collected by CollectBonusItem. It goes back to the start of the main loop at MainLoop_NewPass.
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| UpdateBonusItem | 29210 | LD IX,24124 | IX=State_BonusItem. | |
| 29214 | CALL StoreEntity | Remember the position and state using StoreEntity. | ||
| 29217 | LD C,(IX+5) | C=the cubby hole number from IX+5. | ||
| 29220 | LD B,0 | B=0. | ||
| 29222 | LD HL,24099 | HL=CubbyHoles. | ||
| 29225 | ADD HL,BC | Add the cubby hole number. | ||
| 29226 | LD A,(HL) | A=the contents of the cubby hole. | ||
| 29227 | CP (IX+4) | Compare it with IX+4. | ||
| 29230 | JR NZ,CollectBonusItem | Jump to CollectBonusItem if it has changed. | ||
| 29232 | CALL DisplayEntity | Erase the sprite at the previous position and draw it at the new position using DisplayEntity. | ||
| 29235 | CALL ColouriseSprite | Colour the sprite using ColouriseSprite. | ||
| 29238 | LD A,(24087) | A=the game timer from GameTimer. | ||
| 29241 | AND %00000011 | Keep only bits 0-1 (every fourth update). | ||
| 29243 | JP NZ,MainLoop_NewPass | Jump to MainLoop_NewPass unless the result is zero. | ||
| 29246 | LD A,(IX+3) | A=the colour of the bonus item. | ||
| 29249 | XOR %00000100 | Flip bit 2 (so the item flashes). | ||
| 29251 | LD (IX+3),A | Write it back to the colour of the bonus item. | ||
| 29254 | JP MainLoop_NewPass | Jump to MainLoop_NewPass. | ||
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