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Routines |
| Prev: B82B | Up: Map | Next: B8C4 |
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Used by the routines at B3BE, Switch_DrawSprite_Functions, DrawRoom, Handler_DisplayCharacterLocation, Redraw_Banner_Underline, PrintBanner, DrawCharacterItemLabel and EDF7.
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| Controller_Tile | B84B | LD A,(HL) | A=*HL. | |||||||
| B84C | INC HL | Increment HL by one. | ||||||||
| B84D | CP $80 | If A is lower than 80 jump to Controller_Tile_Draw_Move_Down. | ||||||||
| B84F | JR C,Controller_Tile_Draw_Move_Down | |||||||||
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Return if the terminator is reached.
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| B851 | CP $FF | Return if A is the terminator (FF). | ||||||||
| B853 | RET Z | |||||||||
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Check for the FE control character. This signifies that the subsequent byte is the colour attribute.
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| B854 | CP $FE | If A is not FE jump to Controller_Tile_Screen_Instructions. | ||||||||
| B856 | JR NZ,Controller_Tile_Screen_Instructions | |||||||||
| B858 | LD C,(HL) | C=*HL (set the attribute). | ||||||||
| B859 | INC HL | Increment HL by one. | ||||||||
| B85A | JR Controller_Tile | Jump to Controller_Tile. | ||||||||
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If the value is between A8-E8 then it is screen co-ordinates.
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| Controller_Tile_Screen_Instructions | B85C | CP $A8 | If A is lower than A8 jump to Controller_Tile_Draw_Move_Down. | |||||||
| B85E | JR C,Controller_Tile_Draw_Move_Down | |||||||||
| B860 | CP $E8 | If A is higher than E8 jump to Controller_Tile_Bank. | ||||||||
| B862 | JR NC,Controller_Tile_Bank | |||||||||
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Remove the control number, then we're left with the desired screen co-ordinate data updates.
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| B864 | SUB $C8 | E=(A-C8)+E. | ||||||||
| B866 | ADD A,E | |||||||||
| B867 | LD E,A | |||||||||
| B868 | LD A,D | D+=*HL. | ||||||||
| B869 | ADD A,(HL) | |||||||||
| B86A | LD D,A | |||||||||
| B86B | INC HL | Increment HL by one. | ||||||||
| B86C | JR Controller_Tile | Jump to Controller_Tile. | ||||||||
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Check for the FB control character. This signifies that the following two bytes should be set as the sprite bank address.
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| Controller_Tile_Bank | B86E | CP $FB | If A is not FB jump to Controller_Tile_Check_Move_Down. | |||||||
| B870 | JR NZ,Controller_Tile_Check_Move_Down | |||||||||
| B872 | LD A,(HL) | Write *HL to B7E9. | ||||||||
| B873 | LD ($B7E9),A | |||||||||
| B876 | INC HL | Increment HL by one. | ||||||||
| B877 | LD A,(HL) | Write *HL to B7EA. | ||||||||
| B878 | LD ($B7EA),A | |||||||||
| B87B | INC HL | Increment HL by one. | ||||||||
| B87C | JR Controller_Tile | Jump to Controller_Tile. | ||||||||
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Check for the F1 control character. This signifies that the screen location should move down one block.
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| Controller_Tile_Check_Move_Down | B87E | CP $F1 | If A is F1 jump to Controller_Tile_Move_Down. | |||||||
| B880 | JR Z,Controller_Tile_Move_Down | |||||||||
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Check for the F3 control character. This alters the current message pointer (HL).
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| B882 | CP $F3 | If A is not F3 jump to Controller_Tile_Repeaters. | ||||||||
| B884 | JR NZ,Controller_Tile_Repeaters | |||||||||
| B886 | LD A,(HL) | A=*HL. | ||||||||
| B887 | INC HL | Increment HL by one. | ||||||||
| B888 | LD H,(HL) | H=*HL. | ||||||||
| B889 | LD L,A | L=A. | ||||||||
| B88A | JR Controller_Tile | Jump to Controller_Tile. | ||||||||
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Anything from here involves repetition.
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| Controller_Tile_Repeaters | B88C | LD B,(HL) | B=*HL (counter). | |||||||
| B88D | INC HL | Increment HL by one. | ||||||||
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Check for the F0 control character. Tile sprite to the screen vertically, the number of times indicated in B.
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| B88E | CP $F0 | If A is not F0 jump to Controller_Tile_0. | ||||||||
| B890 | JR NZ,Controller_Tile_0 | |||||||||
| B892 | LD A,(HL) | A=*HL. | ||||||||
| B893 | INC HL | Increment HL by one. | ||||||||
| Controller_Tile_Vertical_Loop | B894 | CALL DrawSprite | Call DrawSprite. | |||||||
| B897 | INC D | Increment D by one. | ||||||||
| B898 | DJNZ Controller_Tile_Vertical_Loop | Decrease counter by one and loop back to Controller_Tile_Vertical_Loop until counter is zero. | ||||||||
| B89A | JR Controller_Tile | Jump to Controller_Tile. | ||||||||
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Check for the F2 control character.
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| Controller_Tile_0 | B89C | CP $F2 | If A is not F2 jump to Controller_Tile_Horizontal. | |||||||
| B89E | JR NZ,Controller_Tile_Horizontal | |||||||||
| Controller_Tile_1 | B8A0 | LD A,(HL) | ||||||||
| B8A1 | INC HL | |||||||||
| B8A2 | CALL DrawSprite | |||||||||
| B8A5 | LD A,(HL) | |||||||||
| B8A6 | INC E | |||||||||
| B8A7 | CALL DrawSprite | |||||||||
| B8AA | INC E | |||||||||
| B8AB | DEC HL | |||||||||
| B8AC | DJNZ Controller_Tile_1 | |||||||||
| B8AE | INC HL | |||||||||
| B8AF | INC HL | |||||||||
| B8B0 | JR Controller_Tile | Jump to Controller_Tile. | ||||||||
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Tile sprite to the screen horizontally, the number of times indicated in B.
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| Controller_Tile_Horizontal | B8B2 | LD A,(HL) | A=*HL. | |||||||
| B8B3 | INC HL | Increment HL by one. | ||||||||
| Controller_Tile_Horizontal_Loop | B8B4 | CALL DrawSprite | Call DrawSprite. | |||||||
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Move to the next screen buffer column.
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| B8B7 | INC E | Increment E by one. | ||||||||
| B8B8 | DJNZ Controller_Tile_Horizontal_Loop | Decrease counter by one and loop back to Controller_Tile_Horizontal_Loop until counter is zero. | ||||||||
| B8BA | JP Controller_Tile | Jump to Controller_Tile. | ||||||||
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Draw a tile, and move the screen position down one character block.
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| Controller_Tile_Draw_Move_Down | B8BD | CALL DrawSprite | Call DrawSprite. | |||||||
| Controller_Tile_Move_Down | B8C0 | INC E | Increment E by one. | |||||||
| B8C1 | JP Controller_Tile | Jump to Controller_Tile. | ||||||||
| Prev: B82B | Up: Map | Next: B8C4 |