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Data |
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This structure contains an assortment of values used to manage the aliens.
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| _ALIEN_ROW_PTR | 31107 | DEFB 0,0 | Pointer to an entry in _ALIEN_ROWS_DATA | |
| _NEXT_ALIEN_ROW_TO_DRAW | 31109 | DEFB 0 | Next screen row to populate with aliens | |
| _LOWEST_ALIEN_YPOS | 31110 | DEFB 0 | cy of the bottom of the lowest row on screen. Used and updated by alien movement and other code | |
| _ALIEN_ROW_LEFT_MARGIN | 31111 | DEFB 0 | How far the aliens are from left side | |
| _ALIEN_ROW_BANK_WIDTH | 31112 | DEFB 0 | Width of this row, starts at 11 aliens, reduces | |
| _ALIEN_ROW_RIGHT_MARGIN | 31113 | DEFB 0 | How far aliens are from the right side | |
| _ALIEN_SPRITE_DATA_PTR | 31114 | DEFB 0,0 | Points to the left or right looking alien sprites | |
| _SPRITE_SCR_DEST | 31116 | DEFB 0,0 | ||
| _SPRITE_DRAW_SCAN_COUNTER | 31118 | DEFB 0 | ||
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