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Routines |
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Used by the routines at UnlinkNextDisplayRecord and ProcessDisplayEntry.
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| SelectJumpIfNotZero | 46643 | LD A,32 | Use the JR NZ opcode (32). |
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This entry point is used by the routine at SelectJumpIfZero.
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| SelectJumpIfNotZero_WriteOpcode | 46645 | LD (46665),A | Write the opcode into the jumps at 46665 and 46680. | |
| 46648 | LD (46680),A | |||
| 46651 | LD IX,(45454) | Read the pointer at 45452+2. | ||
| 46655 | LD L,(IX+4) | Read the handler address from bytes 4-5 of the record. | ||
| 46658 | LD H,(IX+5) | |||
| 46661 | BIT 7,(IX+7) | Jump to SelectJumpIfNotZero_LocationActionFlags if a marker on the character record is set. The opcode at 46665 is modified by SelectJumpIfNotZero_WriteOpcode. | ||
| 46665 | JR NZ,SelectJumpIfNotZero_LocationActionFlags | |||
| 46667 | LD HL,0 | Clear the pointer. | ||
| SelectJumpIfNotZero_LocationActionFlags | 46670 | EX (SP),HL | Swap HL with the return address. | |
| 46671 | PUSH HL | Save that address, and read the location and the action flags. | ||
| 46672 | LD L,(IX+2) | |||
| 46675 | LD H,(IX+3) | |||
| 46678 | BIT 5,H | Jump ahead to SelectJumpIfNotZero_ReturnWithPointers if bit 5 is present. The opcode at 46680 is modified by SelectJumpIfNotZero_WriteOpcode. | ||
| 46680 | JR NZ,SelectJumpIfNotZero_ReturnWithPointers | |||
| 46682 | LD HL,0 | Clear the pointer. | ||
| SelectJumpIfNotZero_ReturnWithPointers | 46685 | EX (SP),HL | Leave the location pointer (or 0000 when bit 5 is clear) on the stack in place of the address saved there. | |
| 46686 | JP (HL) | Return to the caller (its address is now in HL), leaving the location pointer and the handler address on the stack. | ||
| 46687 | LD A,(40975) | Jump to SelectJumpIfNotZero_MessagePrintMessage if the display mode is 5. | ||
| 46690 | CP 5 | |||
| 46692 | JR Z,SelectJumpIfNotZero_MessagePrintMessage | |||
| 46694 | CP 6 | Jump to SelectJumpIfNotZero_MessagePrintMessage when the display mode is 6. | ||
| 46696 | JR Z,SelectJumpIfNotZero_MessagePrintMessage | |||
| 46698 | LD A,(45427) | Jump ahead to SelectJumpIfNotZero_TestDisplayFlag if bit 7 of display mode flag at DisplayModeFlag is clear. | ||
| 46701 | BIT 7,A | |||
| 46703 | JR Z,SelectJumpIfNotZero_TestDisplayFlag | |||
| SelectJumpIfNotZero_MessagePrintMessage | 46705 | LD HL,26709 | Take the message, then call PrintTextAndHandleControlCharacters to print the message. | |
| 46708 | CALL PrintTextAndHandleControlCharacters | |||
| 46711 | RET | Return. | ||
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Test the display flag, and use the display data pointer when that flag is set.
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| SelectJumpIfNotZero_TestDisplayFlag | 46712 | LD HL,45421 | Test bit 0 of the display flag and point HL at the display data pointer. | |
| 46715 | BIT 0,(HL) | |||
| 46717 | LD HL,45426 | |||
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Build this display entry when the flag is clear.
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| 46720 | CALL NZ,ProcessDisplayEntry | Call ProcessDisplayEntry if bit 0 of this byte is set. | ||
| 46723 | CALL SelectJumpIfNotZero | Call SelectJumpIfNotZero to plant the JR NZ opcode and test the character record. |
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| 46726 | LD A,(45421) | Read the display flag and take the display data pointer. | ||
| 46729 | LD HL,45426 | |||
| SelectJumpIfNotZero_BitDisplayFlag | 46732 | LD DE,(45446) | Jump ahead to SelectJumpIfNotZero_ClearStackedPointers if bit 0 of display flag at DisplayFlag is clear. | |
| 46736 | PUSH DE | |||
| 46737 | BIT 0,A | |||
| 46739 | JR Z,SelectJumpIfNotZero_ClearStackedPointers | |||
| 46741 | CALL RestoreSavedCharacterRecord | Call RestoreSavedCharacterRecord to restore the saved character record, then jump to SelectJumpIfNotZero_MessagePrintMessageAgain with the message at 1459. | ||
| 46744 | LD HL,1459 | |||
| 46747 | JR SelectJumpIfNotZero_MessagePrintMessageAgain | |||
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Clear the stacked pointers, then print the message at 1499.
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| SelectJumpIfNotZero_ClearStackedPointers | 46749 | LD HL,0 | Push three zero words for the message. | |
| 46752 | PUSH HL | |||
| 46753 | PUSH HL | |||
| 46754 | PUSH HL | |||
| 46755 | LD HL,1499 | Take the message at 1499. | ||
| SelectJumpIfNotZero_MessagePrintMessageAgain | 46758 | PUSH HL | Take the message, then call PrintTextAndHandleControlCharacters to print the message. | |
| 46759 | LD HL,26772 | |||
| 46762 | CALL PrintTextAndHandleControlCharacters | |||
| 46765 | RET | Return. | ||
| 46766 | LD A,(40976) | Jump to SelectJumpIfNotZero_MessagePrintMessage if the display mode is 5. | ||
| 46769 | CP 5 | |||
| 46771 | JR Z,SelectJumpIfNotZero_MessagePrintMessage | |||
| 46773 | CP 6 | Jump to SelectJumpIfNotZero_MessagePrintMessage when the display mode is 6. | ||
| 46775 | JR Z,SelectJumpIfNotZero_MessagePrintMessage | |||
| 46777 | LD A,(45433) | Jump back to SelectJumpIfNotZero_MessagePrintMessage while bit 7 of display mode flag (45433) is present. | ||
| 46780 | BIT 7,A | |||
| 46782 | JR NZ,SelectJumpIfNotZero_MessagePrintMessage | |||
| 46784 | LD HL,45422 | Take the display flag and take the display mode flag. | ||
| 46787 | BIT 0,(HL) | |||
| 46789 | LD HL,45432 | |||
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Build the alternate display entry.
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| 46792 | CALL NZ,ProcessDisplayEntryAlternate | Call ProcessDisplayEntryAlternate if bit 0 of this byte is set. | ||
| 46795 | CALL SelectJumpIfZero | Call SelectJumpIfZero to plant the JR Z opcode. |
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| 46798 | LD A,(45422) | Jump back to SelectJumpIfNotZero_BitDisplayFlag to check flag and set display parameter. | ||
| 46801 | LD HL,45432 | |||
| 46804 | JR SelectJumpIfNotZero_BitDisplayFlag | |||
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View the equivalent code in;
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