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Routines |
| Prev: DCD1 | Up: Map | Next: DD52 |
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Used by the routine at F43E.
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| MoveTile_Up | DCDC | LD A,($E75E) | A=*E75E. | |
| DCDF | DEC A | Decrease A by one. | ||
| DCE0 | LD ($E760),A | Write A to *E760. | ||
| DCE3 | LD A,($E761) | B=*E761. | ||
| DCE6 | LD B,A | |||
| MoveTile_Up_Loop | DCE7 | PUSH BC | Stash BC on the stack. | |
| DCE8 | LD A,($E75D) | A=*E75D. | ||
| DCEB | DEC A | Decrease A by one. | ||
| DCEC | LD ($E75F),A | Write A to *E75F. | ||
| DCEF | LD B,$04 | B=04. | ||
| MoveTile_Up_0 | DCF1 | PUSH BC | Stash BC on the stack. | |
| DCF2 | LD A,($E75F) | B=*E75F. | ||
| DCF5 | LD B,A | |||
| DCF6 | LD A,($E760) | C=*E760. | ||
| DCF9 | LD C,A | |||
| DCFA | CALL Calculate_ScreenBlockAddress | Call Calculate_ScreenBlockAddress. | ||
| DCFD | PUSH HL | Stash HL on the stack. | ||
| DCFE | DEC B | Decrease B by one. | ||
| DCFF | CALL Calculate_ScreenBlockAddress | Call Calculate_ScreenBlockAddress. | ||
| DD02 | PUSH HL | DE=HL (using the stack). | ||
| DD03 | POP DE | |||
| DD04 | POP HL | Restore HL from the stack. | ||
| DD05 | LD A,$08 | A=08. | ||
| DD07 | LD BC,$0004 | BC=0004. | ||
| DD0A | PUSH HL | Stash HL, HL and DE on the stack. | ||
| MoveTile_Up_1 | DD0B | PUSH HL | ||
| DD0C | PUSH DE | |||
| DD0D | LDIR | LDIR. | ||
| DD0F | DEC HL | Decrease HL by one. | ||
| DD10 | PUSH HL | Stash HL on the stack. | ||
| DD11 | LD (HL),C | Write C to *HL. | ||
| DD12 | POP DE | Restore DE from the stack. | ||
| DD13 | DEC DE | Decrease DE by one. | ||
| DD14 | LD BC,$0003 | BC=0003. | ||
| DD17 | LDDR | LDDR. | ||
| DD19 | POP DE | Restore DE and HL from the stack. | ||
| DD1A | POP HL | |||
| DD1B | INC D | Increment D by one. | ||
| DD1C | INC H | Increment H by one. | ||
| DD1D | LD BC,$0004 | BC=0004. | ||
| DD20 | DEC A | Decrease A by one. | ||
| DD21 | JP NZ,MoveTile_Up_1 | Jump to MoveTile_Up_1 if A is not zero. | ||
| DD24 | POP HL | Restore HL from the stack. | ||
| DD25 | CALL Calculate_AttributeAddress | Call Calculate_AttributeAddress. | ||
| DD28 | LD HL,$FFE0 | HL=FFE0+DE. | ||
| DD2B | ADD HL,DE | |||
| DD2C | EX DE,HL | Exchange the DE and HL registers. | ||
| DD2D | LD BC,$0004 | BC=0004. | ||
| DD30 | LDIR | LDIR. | ||
| DD32 | LD BC,$0003 | BC=0003. | ||
| DD35 | LD A,$47 | A=47. | ||
| DD37 | DEC HL | Decrease HL by one. | ||
| DD38 | LD (HL),A | Write A to *HL. | ||
| DD39 | PUSH HL | Stash HL on the stack. | ||
| DD3A | POP DE | Restore DE from the stack. | ||
| DD3B | DEC DE | Decrease DE by one. | ||
| DD3C | LDDR | LDDR. | ||
| DD3E | LD HL,$E75F | HL=E75F. | ||
| DD41 | INC (HL) | Increment *HL by one. | ||
| DD42 | POP BC | Restore BC from the stack. | ||
| DD43 | DJNZ MoveTile_Up_0 | Decrease counter by one and loop back to MoveTile_Up_0 until counter is zero. | ||
| DD45 | POP BC | Restore BC from the stack. | ||
| DD46 | PUSH BC | Stash BC on the stack. | ||
| DD47 | CALL $DD52 | Call DD52. | ||
| DD4A | LD HL,$E75D | HL=E75D. | ||
| DD4D | DEC (HL) | Decrease *HL by one. | ||
| DD4E | POP BC | Restore BC from the stack. | ||
| DD4F | DJNZ MoveTile_Up_Loop | Decrease counter by one and loop back to MoveTile_Up_Loop until counter is zero. | ||
| DD51 | RET | Return. | ||
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