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Routines |
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Used by the routine at UpdateShot.
Updates a shot that has bit 7 of offset 21 set, which is the kind that is made by LaunchShot_Special. The length of the shot is at offset 14. Purpose of the details not yet known.
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| UpdateSpecialShot | 46100 | LD A,(IX+14) | The high byte of the vertical acceleration. | |||||
| 46103 | AND A | Call PlayFlutterSound if A is not zero. | ||||||
| 46104 | CALL NZ,PlayFlutterSound | |||||||
| 46107 | INC (IX+17) | Increase offset 17 of IX by one. | ||||||
| 46110 | CALL MakeShotRow | Call MakeShotRow. | ||||||
| 46113 | CALL FindObjectScreenAddress | Call FindObjectScreenAddress. | ||||||
| 46116 | LD B,(IX+14) | The high byte of the vertical acceleration. | ||||||
| 46119 | EXX | Switch to the alternate registers. | ||||||
| 46120 | BIT 7,(IX+16) | Jump to UpdateSpecialShot_Shorter if bit 7 of offset 16 of IX is set. | ||||||
| 46124 | JR NZ,UpdateSpecialShot_Shorter | |||||||
| 46126 | BIT 0,(IX+17) | Jump to UpdateSpecialShot_Frame if bit 0 of offset 17 of IX is clear. | ||||||
| 46130 | JR Z,UpdateSpecialShot_Frame | |||||||
| 46132 | LD A,(IX+18) | The vertical screen position. | ||||||
| 46135 | ADD A,(IX+7) | Add the byte at offset 7 of IX to A. | ||||||
| 46138 | LD (IX+7),A | Write the high byte of the horizontal speed. | ||||||
| 46141 | LD A,(IX+14) | The high byte of the vertical acceleration. | ||||||
| 46144 | CP 8 | Jump to UpdateSpecialShot_Test if A is 8. | ||||||
| 46146 | JR Z,UpdateSpecialShot_Test | |||||||
| 46148 | INC (IX+14) | Increase offset 14 of IX by one. | ||||||
| 46151 | BIT 7,(IX+0) | Jump to UpdateSpecialShot_Test if bit 7 of offset 0 of IX is clear. | ||||||
| 46155 | JR Z,UpdateSpecialShot_Test | |||||||
| 46157 | LD A,248 | A=248. | ||||||
| 46159 | ADD A,(IX+11) | Add the byte at offset 11 of IX to A. | ||||||
| 46162 | LD (IX+11),A | Write the high byte of the horizontal acceleration. | ||||||
| UpdateSpecialShot_Test | 46165 | CALL TestShotHitsGround_Wide | Call TestShotHitsGround_Wide. | |||||
| 46168 | JR Z,UpdateSpecialShot_Frame | Jump to UpdateSpecialShot_Frame if the zero flag is set. | ||||||
| 46170 | LD A,(51436) | The high byte of the ship's horizontal speed. | ||||||
| 46173 | LD (IX+7),A | Write the high byte of the horizontal speed. | ||||||
| UpdateSpecialShot_Shorter | 46176 | DEC (IX+14) | Decrease offset 14 of IX by one. | |||||
| 46179 | BIT 7,(IX+0) | Jump to UpdateSpecialShot_Frame if bit 7 of offset 0 of IX is clear. | ||||||
| 46183 | JR Z,UpdateSpecialShot_Frame | |||||||
| 46185 | LD A,8 | A=8. | ||||||
| 46187 | ADD A,(IX+11) | Add the byte at offset 11 of IX to A. | ||||||
| 46190 | LD (IX+11),A | Write the high byte of the horizontal acceleration. | ||||||
| UpdateSpecialShot_Frame | 46193 | CALL MakeShotColumn | Call MakeShotColumn. | |||||
| 46196 | LD A,(IX+17) | The horizontal screen position. | ||||||
| 46199 | CP 22 | Jump to DrawShot if A is not 22. | ||||||
| 46201 | JP NZ,DrawShot | |||||||
| 46204 | SET 7,(IX+16) | Set bit 7 of offset 16 of IX. | ||||||
| 46208 | JP DrawShot | Jump to DrawShot. | ||||||
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