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Routines |
| Prev: F43D | Up: Map | Next: F46B |
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Used by the routine at MainMenu.
Black out the whole attribute file, then clear a 0E×18 character window starting at 5809 (attribute buffer) for the main-menu / controls layout.
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Fill the attribute file, then clear the menu window.
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| Draw_MenuBackground | F454 | XOR A | Clear A (black ink/paper), then call Set_BorderSpeakerState to fill the attribute file. | |
| F455 | CALL Set_BorderSpeakerState | |||
| F458 | LD HL,$5809 | Point HL at the menu window top-left (5809 (attribute buffer)). | ||
| F45B | LD DE,$0012 | Load DE with the per-row skip (0012 bytes). | ||
| F45E | LD C,$18 | Load C with 18 row counter. | ||
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Clear one attribute row of the 0E×18 menu window.
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| Draw_MenuBackground_RowLoop | F460 | LD B,$0E | Load B with 0E column counter. | |
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Black out one attribute cell inside the menu window.
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| Draw_MenuBackground_ColLoop | F462 | LD (HL),A | Write black at HL. Advance one character. Loop across the row. | |
| F463 | INC HL | |||
| F464 | DJNZ Draw_MenuBackground_ColLoop | |||
| F466 | ADD HL,DE | Step HL by the row skip in DE. | ||
| F467 | DEC C | Decrease the row counter. | ||
| F468 | JR NZ,Draw_MenuBackground_RowLoop | Jump to Draw_MenuBackground_RowLoop if more rows remain. | ||
| F46A | RET | Return. | ||
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