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Routines |
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Used by the routines at UpdatePanel and GameOver.
Prints a line of text, which starts with its attribute, using the ASCII font at 6188. The last character of the text has bit 7 set. Each character cell has its attribute set as well.
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Point at the ASCII font and fetch the attribute from the text.
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| PrintTextStandardFont | BBB1 | PUSH HL | Stash the pixel position on the stack. | |||||||
| BBB2 | LD HL,$6188 | Point HL at 6188. | ||||||||
| BBB5 | LD ($5B27),HL | Set FontPointer. | ||||||||
| BBB8 | POP BC | Copy the pixel position to BC (using the stack). | ||||||||
| BBB9 | PUSH BC | |||||||||
| BBBA | CALL CalculateBufferAddress | Call CalculateBufferAddress. | ||||||||
| BBBD | LD L,C | Copy it to HL. | ||||||||
| BBBE | LD H,B | |||||||||
| BBBF | LD A,(DE) | Fetch the attribute of the text. | ||||||||
| BBC0 | EX AF,AF' | Keep the attribute in AF'. | ||||||||
| BBC1 | INC DE | Move on to the first character. | ||||||||
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This entry point is used by the routine at PrintTextSingleColour.
Find the attribute address.
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| PrintTextStandardFont_PrintLine | BBC2 | EXX | Switch to the shadow registers. | |||||||
| BBC3 | POP HL | Fetch the pixel position. | ||||||||
| BBC4 | PUSH DE | Stash the address of the text on the stack. | ||||||||
| BBC5 | CALL CalculateAttributeAddress | Call CalculateAttributeAddress. | ||||||||
| BBC8 | LD L,E | Copy it to HL. | ||||||||
| BBC9 | LD H,D | |||||||||
| BBCA | POP DE | Restore the address of the text from the stack. | ||||||||
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Print each character and set its attribute.
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| PrintTextStandardFont_NextCharacter | BBCB | EXX | Switch back to the main registers. | |||||||
| BBCC | LD A,(DE) | Fetch a character of the text. | ||||||||
| BBCD | BIT 7,A | Jump to PrintTextStandardFont_LastCharacter if it is the last. | ||||||||
| BBCF | JR NZ,PrintTextStandardFont_LastCharacter | |||||||||
| BBD1 | PUSH DE | Stash the address of the text on the stack. | ||||||||
| BBD2 | CALL PrintCharacter | Call PrintCharacter. | ||||||||
| BBD5 | POP DE | Restore the address of the text from the stack. | ||||||||
| BBD6 | INC DE | Move on to the next character. | ||||||||
| BBD7 | EXX | Switch to the shadow registers. | ||||||||
| BBD8 | EX AF,AF' | Fetch the attribute. | ||||||||
| BBD9 | LD (HL),A | Set the attribute of the cell. | ||||||||
| BBDA | INC L | Move on to the next cell. | ||||||||
| BBDB | EX AF,AF' | Keep the attribute in AF'. | ||||||||
| BBDC | JR PrintTextStandardFont_NextCharacter | Jump to PrintTextStandardFont_NextCharacter. | ||||||||
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Print the last character.
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| PrintTextStandardFont_LastCharacter | BBDE | AND %01111111 | Keep only bits 0 to 6. | |||||||
| BBE0 | PUSH DE | Stash the address of the text on the stack. | ||||||||
| BBE1 | CALL PrintCharacter | Call PrintCharacter. | ||||||||
| BBE4 | POP DE | Restore the address of the text from the stack. | ||||||||
| BBE5 | INC DE | Move on past the text. | ||||||||
| BBE6 | EXX | Switch to the shadow registers. | ||||||||
| BBE7 | EX AF,AF' | Fetch the attribute. | ||||||||
| BBE8 | LD (HL),A | Set the attribute of the last cell. | ||||||||
| BBE9 | EXX | Switch back to the main registers. | ||||||||
| BBEA | RET | Return. | ||||||||
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View the equivalent code in;
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