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Routines |
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Scrolls the playarea attribute buffer right by one column to match the pixel scrolling. This keeps the colours aligned with the screen content when its scrolling horizontally.
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| ScrollAttributes_Right | 678C | LD HL,$59FE | Set the source address in HL to 59FE (attribute buffer location). | |
| 678F | LD DE,$59FF | And the destination address in DE to 59FF (attribute buffer location). | ||
| 6792 | LD B,$10 | Set a counter in B to process 10 rows. | ||
| ScrollAttributes_Right_RowLoop | 6794 | LD C,$FF | C=FF. | |
| 6796 | LDD | Copy 1F bytes per row. This shifts the entire row right by 01 position. | ||
| 6798 | LDD | |||
| 679A | LDD | |||
| 679C | LDD | |||
| 679E | LDD | |||
| 67A0 | LDD | |||
| 67A2 | LDD | |||
| 67A4 | LDD | |||
| 67A6 | LDD | |||
| 67A8 | LDD | |||
| 67AA | LDD | |||
| 67AC | LDD | |||
| 67AE | LDD | |||
| 67B0 | LDD | |||
| 67B2 | LDD | |||
| 67B4 | LDD | |||
| 67B6 | LDD | |||
| 67B8 | LDD | |||
| 67BA | LDD | |||
| 67BC | LDD | |||
| 67BE | LDD | |||
| 67C0 | LDD | |||
| 67C2 | LDD | |||
| 67C4 | LDD | |||
| 67C6 | LDD | |||
| 67C8 | LDD | |||
| 67CA | LDD | |||
| 67CC | LDD | |||
| 67CE | LDD | |||
| 67D0 | LDD | |||
| 67D2 | LDD | |||
| 67D4 | DEC HL | Skip the last column of the source row. | ||
| 67D5 | DEC DE | Skip the last column of the destination row. | ||
| 67D6 | DJNZ ScrollAttributes_Right_RowLoop | Decrease the row counter by one and loop back to ScrollAttributes_Right_RowLoop until all of the rows have been processed. | ||
| 67D8 | LD HL,$5800 | HL=5800 (attribute buffer location). | ||
| 67DB | JP FillNewAttributeColumn | Jump to FillNewAttributeColumn. | ||
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