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Routines |
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Used by the routines at PrintLeftHalfOfCharacter, PrintRightHalfOfCharacter and DrawDoubleHeightCharacter.
Sets the attribute of the character square that holds the screen address.
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Find the attribute address from the screen address.
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| SetTileAttribute | 54844 | PUSH DE | Stash DE and HL on the stack. | |||||||
| 54845 | PUSH HL | |||||||||
| 54846 | LD A,H | Find the third of the screen from the high byte. | ||||||||
| 54847 | RRCA | |||||||||
| 54848 | RRCA | |||||||||
| 54849 | RRCA | |||||||||
| 54850 | AND %00000011 | Keep the two bits of the third. | ||||||||
| 54852 | LD H,A | Make it the high byte of the attribute address. | ||||||||
| 54853 | LD DE,22528 | Add 22528 the start of the attribute buffer. | ||||||||
| 54856 | ADD HL,DE | |||||||||
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Write the attribute.
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| 54857 | EX AF,AF' | Fetch the attribute. | ||||||||
| 54858 | LD (HL),A | Set the attribute. | ||||||||
| 54859 | EX AF,AF' | Keep it. | ||||||||
| 54860 | POP HL | Restore HL and DE from the stack. | ||||||||
| 54861 | POP DE | |||||||||
| 54862 | RET | Return. | ||||||||
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