| ← 9610 | Map | 9667 → |
9635: Draw or color the mirror side wall on the bat's side
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Draws the mirror side wall, the safety net barrier down the bat's own losing edge.
The permanent border wall holds the far edge.
It both lays the tiles down and steps the color fade.
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The wall opposite the bat is composed by draw_side_wall from the real bat side. This routine targets the other edge, the bat's own.
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| draw_mirror_wall | 9635 | OR A | Redraw the wall's tiles, or flood its band with one attribute? | ||||
| 9636 | JR NZ,color_mirror_wall | ||||||
| 9638 | LD A,(bat_side) | Tile-redraw mode: flip the bat side, redraw the mirror wall via draw_side_wall on the flipped side, then restore the bat side. | |||||
| 963B | PUSH AF | ||||||
| 963C | XOR $01 | ||||||
| 963E | LD (bat_side),A | ||||||
| 9641 | CALL draw_side_wall | ||||||
| 9644 | POP AF | ||||||
| 9645 | LD (bat_side),A | ||||||
| 9648 | RET | ||||||
| color_mirror_wall | 9649 | EX AF,AF' | Attribute mode: stash the fill byte in A', then pick the band column from the bat side – the mirror edge on the bat's side. | ||||
| 964A | LD A,(bat_side) | ||||||
| 964D | OR A | ||||||
| 964E | JR NZ,band_left | ||||||
| 9650 | LD HL,ATTR_BASE+$9E | Bat on the right: anchor the 2-wide band at the right edge, column 30 of attribute row 4. | |||||
| 9653 | JR fill_band | ||||||
| band_left | 9655 | LD HL,ATTR_BASE+$80 | Bat on the left: anchor the band at the left edge, column 0 of attribute row 4. | ||||
| fill_band | 9658 | EX AF,AF' | Recover the fill byte into C. | ||||
| 9659 | LD C,A | ||||||
| 965A | LD B,$12 | Walk the band's full height. | |||||
| 965C | LD DE,$0020 | Row stride: 32 cells to the next attribute row | |||||
| fill_band_row | 965F | LD (HL),C | Write the fill byte to both columns of the row, then step down one 32-column row. | ||||
| 9660 | INC HL | ||||||
| 9661 | LD (HL),C | ||||||
| 9662 | DEC HL | ||||||
| 9663 | ADD HL,DE | ||||||
| 9664 | DJNZ fill_band_row | ||||||
| 9666 | RET | ||||||
| ← 9610 | Map | 9667 → |