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Routines |
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Used by the routine at MainMenu.
Black out the whole attribute file, then clear a 14×24 character window starting at 22537 (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 | 62548 | XOR A | Clear A (black ink/paper), then call Set_BorderSpeakerState to fill the attribute file. | |
| 62549 | CALL Set_BorderSpeakerState | |||
| 62552 | LD HL,22537 | Point HL at the menu window top-left (22537 (attribute buffer)). | ||
| 62555 | LD DE,18 | Load DE with the per-row skip (0018 bytes). | ||
| 62558 | LD C,24 | Load C with 24 row counter. | ||
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Clear one attribute row of the 14×24 menu window.
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| Draw_MenuBackground_RowLoop | 62560 | LD B,14 | Load B with 14 column counter. | |
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Black out one attribute cell inside the menu window.
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| Draw_MenuBackground_ColLoop | 62562 | LD (HL),A | Write black at HL. Advance one character. Loop across the row. | |
| 62563 | INC HL | |||
| 62564 | DJNZ Draw_MenuBackground_ColLoop | |||
| 62566 | ADD HL,DE | Step HL by the row skip in DE. | ||
| 62567 | DEC C | Decrease the row counter. | ||
| 62568 | JR NZ,Draw_MenuBackground_RowLoop | Jump to Draw_MenuBackground_RowLoop if more rows remain. | ||
| 62570 | RET | Return. | ||
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