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Routines |
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This displays the bands of aliens - from the bottom upwards it's red, bleep, red, bleep, green, bleep, green, bleep, yellow.
Used by the routine at start.
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| init_draw_aliens | 31075 | LD A,4 | 5 rows (really, P flag is used below) | |
| init_draw_aliens_0 | 31077 | LD (_ALIEN_BAND_ARG),A | Alien row counter, 4 to 0 | |
| 31080 | CALL find_alien_row_data | Address of alien row 'A's data into IX | ||
| 31083 | CALL prep_alien_row_data | Work out this row's left side space, the width of the horde, and the right side space. Prime all values ready for the print routine. | ||
| 31086 | CALL print_alien_row | Print a row of aliens on screen. Alien data is at IX, _NEXT_ALIEN_ROW_TO_DRAW holds screen cx,cy | ||
| 31089 | CALL sound_burbler | Sound burbler, row of aliens appearing | ||
| 31092 | DEFB 25,240,100,120,25,240,0 | |||
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Sound burbler return point
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| 31099 | LD A,(_ALIEN_BAND_ARG) | Dec counter and repeat 5 times. | ||
| 31102 | DEC A | |||
| 31103 | JP P,init_draw_aliens_0 | |||
| 31106 | RET | |||
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