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Routines |
| Prev: 989A | Up: Map | Next: 995F |
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Used by the routine at 989A.
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| Jump_GraphicLayoutRoutine | 9945 | INC IX | Advance IX to first parameter byte in graphic layout data. | |||||||
| 9947 | SUB $E6 | Subtract E6 to get zero-based index of required instruction. | ||||||||
| 9949 | ADD A,A | Load BC with double index of graphic layout data instruction. | ||||||||
| 994A | LD C,A | |||||||||
| 994B | LD B,$00 | |||||||||
| 994D | PUSH HL | Stash HL on the stack. | ||||||||
| 994E | LD HL,$995F | Load HL with start address of table of addresses of graphic layout data handling routines. | ||||||||
| 9951 | ADD HL,BC | Add doubled instruction index as offset to HL to point to address of required routine. | ||||||||
| 9952 | LD A,(HL) | Modify JP instruction at 995C with this address. |
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| 9953 | LD ($995D),A | |||||||||
| 9956 | INC HL | |||||||||
| 9957 | LD A,(HL) | |||||||||
| 9958 | LD ($995E),A | |||||||||
| 995B | POP HL | Restore HL from the stack. | ||||||||
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The operand of the instruction at 995C represents the addresses of the required graphic layout data handling routine. This is modified by the instructions at 9953 and 9958.
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| 995C | JP $0000 | Jump to appropriate instruction handling routine. | ||||||||
| Prev: 989A | Up: Map | Next: 995F |