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Routines |
| Prev: B21E | Up: Map | Next: B26B |
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This routine "swaps" the data between DE and HL.
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| ChangePlayer | B235 | LD A,($969E) | A=Flag_ActivePlayer. | |
| B238 | CPL | Flip the bits. | ||
| B239 | LD ($969E),A | Write this back to Flag_ActivePlayer. | ||
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These are all the player states.
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| B23C | LD HL,$96BC | HL=96BC | ||
| B23F | LD DE,$96DF | DE=96DF. | ||
| B242 | LD BC,$0023 | BC=23 (counter). | ||
| B245 | CALL ChangePlayer_Loop | Call ChangePlayer_Loop. | ||
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This is the current "map".
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| B248 | LD HL,$DDEC | HL=DDEC. | ||
| B24B | LD DE,$DFEC | DE=DFEC. | ||
| B24E | LD BC,$0200 | BC=0200 (counter). | ||
| B251 | CALL ChangePlayer_Loop | Call ChangePlayer_Loop. | ||
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And this is the active sprites.
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| B254 | LD HL,$9702 | HL=ImmortalData. | ||
| B257 | LD DE,$982E | DE=982E. | ||
| B25A | LD BC,$012C | BC=012C (counter). | ||
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This looks complicated but it's just grabbing the data from DE, grabbing the data from HL, and writing the others data to each one.
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| ChangePlayer_Loop | B25D | LD A,(DE) | Fetch a byte from DE and store it in A. | |
| B25E | EX AF,AF' | Switch to the shadow AF register. | ||
| B25F | LD A,(HL) | Copy a byte from HL and write it to DE. | ||
| B260 | LD (DE),A | |||
| B261 | EX AF,AF' | Switch back to the normal AF register. | ||
| B262 | LD (HL),A | Write the byte held in A (orginally from DE) into HL. | ||
| B263 | INC DE | Increment DE by one. | ||
| B264 | INC HL | Increment HL by one. | ||
| B265 | DEC BC | Decrease C by one. | ||
| B266 | LD A,B | Loop back to ChangePlayer_Loop until the counter in BC is zero. | ||
| B267 | OR C | |||
| B268 | JR NZ,ChangePlayer_Loop | |||
| B26A | RET | Return. | ||
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View the equivalent code in;
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