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Routines |
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Used by the routines at CheckPauseAndSilence and DrawShipTop.
Does nothing unless part 04 has been fitted. Draws the flame at the side of the ship when it is moving to the left or to the right, from the object at SideFlameObject, and sets its attribute with SetFlameAttributes. This is a best reading of the code.
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| DrawSideFlames | C5FF | LD A,($F5F1) | The fourth part flag. | |
| C602 | AND A | Return if A is zero. | ||
| C603 | RET Z | |||
| C604 | LD IX,$C6C2 | The side flame object. | ||
| C608 | LD HL,$0000 | HL=00. | ||
| C60B | LD ($5C1C),HL | No saved row count. | ||
| C60E | BIT 7,(IX+$03) | Jump to DrawSideFlames_Flame if bit 7 of offset 03 of IX is set. | ||
| C612 | JR NZ,DrawSideFlames_Flame | |||
| C614 | LD A,($5C37) | The controls. | ||
| C617 | AND %00000011 | Keep the bits of A that are set in 03. | ||
| C619 | RET Z | Return if the zero flag is set. | ||
| C61A | JR DrawSideFlames_Update | Jump to DrawSideFlames_Update. | ||
| DrawSideFlames_Flame | C61C | CALL FetchSpriteType | Call FetchSpriteType. | |
| C61F | LD ($5C1C),A | The flame sprite's width. | ||
| C622 | LD HL,($C6C3) | Fetch the word at C6C3 into HL. | ||
| C625 | LD IY,$A641 | The fifth aligned-row erase. | ||
| C629 | BIT 6,(IX+$03) | Jump to DrawSideFlames_Update if bit 6 of offset 03 of IX is clear. | ||
| C62D | JR Z,DrawSideFlames_Update | |||
| C62F | LD IY,$A7C4 | The fifth mirrored-row erase. | ||
| C633 | LD B,$F9 | B=F9. | ||
| DrawSideFlames_Update | C635 | EXX | Switch to the alternate registers. | |
| C636 | LD (IX+$03),$00 | Store 00 at offset 03 of IX. | ||
| C63A | LD A,($5C37) | The controls. | ||
| C63D | AND %00000011 | Keep the bits of A that are set in 03. | ||
| C63F | JP Z,DrawSideFlames_Draw | Jump to DrawSideFlames_Draw if the zero flag is set. | ||
| C642 | LD A,($8F53) | The ship state. | ||
| C645 | CP $0A | Jump to DrawSideFlames_Draw if A is 0A or more. | ||
| C647 | JR NC,DrawSideFlames_Draw | |||
| C649 | LD A,(IX+$06) | Read offset 06 of IX. | ||
| C64C | INC A | Advance A. | ||
| C64D | AND %00000111 | Keep the bits of A that are set in 07. | ||
| C64F | LD (IX+$06),A | Write A to offset 06 of IX. | ||
| C652 | LD HL,$C7A9 | The flame frames. | ||
| C655 | CALL AddAToHL | Call AddAToHL. | ||
| C658 | LD A,(HL) | Read HL. | ||
| C659 | ADD A,$0E | Add 0E to A. | ||
| C65B | LD (IX+$00),A | Write A to offset 00 of IX. | ||
| C65E | CALL FetchSpriteType | Call FetchSpriteType. | ||
| C661 | LD ($5C1D),A | The flame sprite's width. | ||
| C664 | LD (IX+$03),$80 | Store 80 at offset 03 of IX. | ||
| C668 | LD IX,$A68C | The fifth aligned-row draw. | ||
| C66C | LD A,($5C38) | The ship row. | ||
| C66F | ADD A,$08 | Add 08 to A. | ||
| C671 | LD H,A | H=A. | ||
| C672 | LD L,$50 | L=50. | ||
| C674 | LD A,($5C37) | The controls. | ||
| C677 | BIT 1,A | Jump to DrawSideFlames_Draw2 if bit 1 of A is clear. | ||
| C679 | JR Z,DrawSideFlames_Draw2 | |||
| C67B | LD L,$98 | L=98. | ||
| C67D | LD B,$F9 | B=F9. | ||
| C67F | LD A,$C0 | A=C0. | ||
| C681 | LD ($C6C5),A | The side flame faces left. | ||
| C684 | LD IX,$A7F2 | The fifth mirrored-row draw. | ||
| DrawSideFlames_Draw2 | C688 | LD ($C6C6),HL | The position of the side flame. | |
| C68B | CALL GetScreenAddress | Call GetScreenAddress. | ||
| C68E | LD ($C6C3),HL | The screen address of the side flame. | ||
| DrawSideFlames_Draw | C691 | CALL DrawSpritesDirectly | Call DrawSpritesDirectly. | |
| C694 | LD A,($C6C5) | The side flame faces left. | ||
| C697 | AND %10000000 | Keep the bits of A that are set in 80. | ||
| C699 | RET Z | Return if the zero flag is set. | ||
| C69A | LD HL,($C6C6) | Fetch the word at C6C6 into HL. | ||
| C69D | LD A,L | A=L. | ||
| C69E | AND %11110000 | Keep the bits of A that are set in F0. | ||
| C6A0 | LD L,A | L=A. | ||
| C6A1 | LD A,H | A=H. | ||
| C6A2 | SUB $04 | Subtract 04 from A. | ||
| C6A4 | LD H,A | H=A. | ||
| C6A5 | LD A,($C6C8) | The flame attribute. | ||
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This entry point is used by the routine at DrawMainFlame.
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| SetFlameAttributes | C6A8 | EX DE,HL | Swap DE and HL. | |
| C6A9 | LD HL,$0202 | HL=0202. | ||
| C6AC | LD ($AF01),HL | Update the attribute area. | ||
| C6AF | LD HL,$C79B | The flame attributes. | ||
| C6B2 | AND %00000111 | Keep the bits of A that are set in 07. | ||
| C6B4 | CALL AddAToHL | Call AddAToHL. | ||
| C6B7 | LD A,(HL) | Read HL. | ||
| C6B8 | EX DE,HL | Swap DE and HL. | ||
| C6B9 | LD ($AF03),A | The attribute of the side flame. | ||
| C6BC | LD DE,$AF01 | The attribute area. | ||
| C6BF | JP FillAttributes | Jump to FillAttributes. | ||
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