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Routines |
| Prev: 7208 | Up: Map | Next: 723F |
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Used by the routine at Run_Main_Loop_Body.
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This is a self-modified instruction so the immediate value is patched at runtime. If it is non-zero, store it in *CurrentLevel.
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| RoomHandlerDispatch | 720F | LD A,$00 | A=00. | |
| 7211 | OR A | Jump to RoomHandlerDispatch_TestSpriteAttributes if A is zero. | ||
| 7212 | JR Z,RoomHandlerDispatch_TestSpriteAttributes | |||
| 7214 | LD ($5FB1),A | Write A to *CurrentLevel. | ||
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If *RespawnFlag is non-zero, clear 07FF bytes of the sprite attribute buffer at E800.
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| RoomHandlerDispatch_TestSpriteAttributes | 7217 | LD A,($5FBB) | A=*RespawnFlag. | |
| 721A | OR A | Jump to RoomHandlerDispatch_Lookup if A is zero. | ||
| 721B | JR Z,RoomHandlerDispatch_Lookup | |||
| 721D | LD HL,$E800 | Clear 07FF bytes from E800 onwards. | ||
| 7220 | LD DE,$E801 | |||
| 7223 | LD (HL),$00 | |||
| 7225 | LD BC,$07FF | |||
| 7228 | LDIR | |||
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Look up the handler address for the current room from the jump table at JumpTable_RoomHandler. Each entry is a two-byte address; the room number (one-indexed) is decremented to form a zero-based index.
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| RoomHandlerDispatch_Lookup | 722A | LD A,($5FB1) | B=*CurrentLevel. | |
| 722D | LD B,A | |||
| 722E | LD A,($5FC5) | A=*CurrentRoom. | ||
| 7231 | DEC A | Decrement to make the room ID zero-indexed. | ||
| 7232 | LD DE,$7B2E | DE=JumpTable_RoomHandler. | ||
| 7235 | LD L,A | Transfer the room index to HL. | ||
| 7236 | LD H,$00 | |||
| 7238 | ADD HL,HL | Multiply by 02 (two bytes per table entry). | ||
| 7239 | ADD HL,DE | Add the jump table base address. | ||
| 723A | LD E,(HL) | Read the two-byte handler address from the table into DE. | ||
| 723B | INC HL | |||
| 723C | LD D,(HL) | |||
| 723D | EX DE,HL | Transfer the handler address to HL. | ||
| 723E | JP (HL) | Jump to the room handler. | ||
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