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Routines |
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Used by the routine at Attract_Mode_Loop.
Advances the intro screen colour cycling effect by one step. Reads source and replacement colours from Intro_Colour_Cycle_Table via the pointer at Intro_Colour_Cycle_Pointer, then scans all 768 attribute cells and replaces every cell matching the source colour with the replacement.
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| Advance_Intro_Colour_Cycle | F5A0 | LD HL,($F59E) | Load the colour cycle pointer and read the source colour. | |
| F5A3 | LD D,(HL) | |||
| F5A4 | INC HL | |||
| Advance_Intro_Colour_Cycle_Read | F5A5 | LD A,(HL) | Read the next cycle entry; jump to Advance_Intro_Colour_Cycle_Apply if not the end. | |
| F5A6 | CP $FF | |||
| F5A8 | JR NZ,Advance_Intro_Colour_Cycle_Apply | |||
| F5AA | LD HL,$F5B7 | Reset the colour cycle pointer to the table start. | ||
| F5AD | JR Advance_Intro_Colour_Cycle_Read | |||
| Advance_Intro_Colour_Cycle_Apply | F5AF | LD E,A | Set up the replacement and source colours. | |
| F5B0 | LD A,D | |||
| F5B1 | LD ($F59E),HL | Save the updated colour cycle pointer. | ||
| F5B4 | JP Advance_Colour_Cycle_Scan | Scan the attribute area and apply the colour swap. | ||
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