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Routines |
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Used by the routines at Reset_Text_Position, Initialise_Room_Display, MainMenu and Print_ControlsMenu.
Print a menu printer stream from BC. Fragment headers are three bytes (address low/high, attribute); & (26) starts a new fragment; ] (5D) ends the stream. Uses the character set at Pointer_CurrentCharacterSet.
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Entry: pop the CALL return address into BC as the printer-stream pointer.
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| Print_Menu_Strings | AD6F | POP BC | Pop the stream pointer into BC. | |
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Read the next menu-string fragment header: screen address and attribute into CurrentTextAttribute.
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| Print_Menu_Strings_FetchByte | AD70 | LD A,(BC) | Fetch a byte through the pointer in BC. | |
| AD71 | LD L,A | Keep the screen-address low byte in L. | ||
| AD72 | INC BC | Advance the stream pointer in BC by one. | ||
| AD73 | LD A,(BC) | Fetch a byte through the pointer in BC. | ||
| AD74 | LD H,A | Keep the screen-address high byte in H. | ||
| AD75 | INC BC | Advance the counter/pointer in BC by one. | ||
| AD76 | LD A,(BC) | Fetch a byte through the pointer in BC. | ||
| AD77 | LD ($7307),A | Set the temporary room/state byte (CurrentTextAttribute). | ||
| AD7A | INC BC | Advance the counter/pointer in BC by one. | ||
| AD7B | LD D,$00 | Clear D (high byte of a pointer/offset). | ||
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Fetch the next glyph: 26 starts a new fragment, 5D ends the stream, else print it.
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| Print_Menu_Strings_FetchGlyph | AD7D | LD A,(BC) | Fetch a byte through the pointer in BC. | |
| AD7E | INC BC | Advance the counter/pointer in BC by one. | ||
| AD7F | CP $26 | Is A equal to 26? If so, jump to Print_Menu_Strings_FetchByte. | ||
| AD81 | JR Z,Print_Menu_Strings_FetchByte | |||
| AD83 | CP $5D | Is A equal to 5D? If not, jump to Print_Menu_Strings_PrintGlyph. | ||
| AD85 | JR NZ,Print_Menu_Strings_PrintGlyph | |||
| AD87 | PUSH BC | Stash BC on the stack. | ||
| AD88 | RET | Return. | ||
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Print one menu glyph and loop for the next, then clear the display buffers on the fall-through path.
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| Print_Menu_Strings_PrintGlyph | AD89 | LD E,A | Keep the glyph code in E for Print_Character. | |
| AD8A | CALL Print_Character | Call Print_Character to print Character. | ||
| AD8D | INC HL | Advance the current pointer by one byte. | ||
| AD8E | JR Print_Menu_Strings_FetchGlyph | Jump to Print_Menu_Strings_FetchGlyph to print the next menu glyph. | ||
| AD90 | CALL Clear_BothDisplayBuffers | Call Clear_BothDisplayBuffers to clear both display buffers. | ||
| AD93 | LD A,$12 | Load A with 12. | ||
| AD95 | CALL Clear_AttributeFile | Call Clear_AttributeFile to clear Attribute File. | ||
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