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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 | D63C | PUSH DE | Stash DE and HL on the stack. | |||||||
| D63D | PUSH HL | |||||||||
| D63E | LD A,H | Find the third of the screen from the high byte. | ||||||||
| D63F | RRCA | |||||||||
| D640 | RRCA | |||||||||
| D641 | RRCA | |||||||||
| D642 | AND %00000011 | Keep the two bits of the third. | ||||||||
| D644 | LD H,A | Make it the high byte of the attribute address. | ||||||||
| D645 | LD DE,$5800 | Add 5800 the start of the attribute buffer. | ||||||||
| D648 | ADD HL,DE | |||||||||
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Write the attribute.
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| D649 | EX AF,AF' | Fetch the attribute. | ||||||||
| D64A | LD (HL),A | Set the attribute. | ||||||||
| D64B | EX AF,AF' | Keep it. | ||||||||
| D64C | POP HL | Restore HL and DE from the stack. | ||||||||
| D64D | POP DE | |||||||||
| D64E | RET | Return. | ||||||||
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