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Routines |
| Prev: AAC4 | Up: Map | Next: AB4C |
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Used by the routines at AAC4 and ProcessCharacterData.
When nothing is on screen, clears the picture buffer and selects picture mode.
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| StartPictureModeScreenIdle | AAD1 | PUSH DE | Save DE and jump to StartPictureModeScreenIdle_CheckDisplayMode if the command mode at A024 is set. | |
| AAD2 | LD A,($A024) | |||
| AAD5 | AND A | |||
| AAD6 | JR NZ,StartPictureModeScreenIdle_CheckDisplayMode | |||
| AAD8 | LD ($AAA7),A | Clear the state byte at AAA7. | ||
| AADB | LD HL,($A02B) | Read the word at ActiveTextPointer, save it and call ClearCoordinateBuffer to clear the co-ordinate buffer. | ||
| AADE | PUSH HL | |||
| AADF | CALL ClearCoordinateBuffer | |||
| AAE2 | JR NZ,StartPictureModeScreenIdle_ClearBorrow | Go to StartPictureModeScreenIdle_ClearBorrow when ClearCoordinateBuffer returns non-zero. | ||
| AAE4 | LD A,($AAA7) | Jump to StartPictureModeScreenIdle_ClearBorrow if the state byte at AAA7 is set. | ||
| AAE7 | AND A | |||
| AAE8 | JR NZ,StartPictureModeScreenIdle_ClearBorrow | |||
| AAEA | LD A,$02 | Write 02 to the command mode at A024. | ||
| AAEC | LD ($A024),A | |||
| AAEF | POP HL | Restore the saved pointer from the stack. | ||
| AAF0 | PUSH IY | Copy the character record from IY into HL. | ||
| AAF2 | POP HL | |||
| AAF3 | LD DE,$0018 | Point HL at the co-ordinates 0018 bytes into the character record, and DE at the buffer at Buffer_CoordinateData. | ||
| AAF6 | ADD HL,DE | |||
| AAF7 | LD DE,$AAAC | |||
| AAFA | EX DE,HL | Swap the pointers, take 06 bytes and copy them. | ||
| AAFB | LD BC,$0006 | |||
| AAFE | LDIR | |||
| AB00 | LD HL,($A029) | Read the word at SavedTextPointer. | ||
| AB03 | LD ($A02B),HL | Store it in the word at ActiveTextPointer and jump ahead to StartPictureModeScreenIdle_CheckDisplayMode to check display mode. | ||
| AB06 | JR StartPictureModeScreenIdle_CheckDisplayMode | |||
| StartPictureModeScreenIdle_ClearBorrow | AB08 | LD A,$01 | Write 01 to the command mode at A024. | |
| AB0A | LD ($A024),A | |||
| AB0D | POP HL | Restore the saved pointer from the stack. | ||
| AB0E | LD ($A02B),HL | Store the pointer in the word at ActiveTextPointer. | ||
| StartPictureModeScreenIdle_CheckDisplayMode | AB11 | POP DE | Restore the source from the stack. | |
| AB12 | XOR A | Clear the state byte at AAA7 and call CheckDisplayMode to check display mode. | ||
| AB13 | LD ($AAA7),A | |||
| AB16 | CALL CheckDisplayMode | |||
| AB19 | JR C,CopyDisplayIfNeeded_ReportDone | Jump ahead to CopyDisplayIfNeeded_ReportDone if CheckDisplayMode finds the marker bit already clear. | ||
| AB1B | JR Z,StartPictureModeScreenIdle_TestBitLowByte | Go to StartPictureModeScreenIdle_TestBitLowByte if bit 1 of the source is clear. | ||
| AB1D | CP $90 | Jump ahead to SearchCommandHandlerTable if it is 90. | ||
| AB1F | JP Z,SearchCommandHandlerTable | |||
| AB22 | CP $A0 | Jump ahead to HandleClassAWord if it is A0. | ||
| AB24 | JP Z,HandleClassAWord | |||
| AB27 | BIT 3,E | Jump ahead to ReadObjectProcessingFlag if bit 3 is clear. | ||
| AB29 | JR Z,ReadObjectProcessingFlag | |||
| AB2B | LD A,($A012) | Jump to CopyDisplayIfNeeded_ReportDone if the pictures-enabled byte at A012 is set. | ||
| AB2E | AND A | |||
| AB2F | JR NZ,CopyDisplayIfNeeded_ReportDone | |||
| AB31 | LD A,($A01B) | Jump to ReadObjectProcessingFlag if the initialised flag is set. | ||
| AB34 | AND A | |||
| AB35 | JR NZ,ReadObjectProcessingFlag | |||
| AB37 | LD A,($A02D) | Jump to CopyDisplayIfNeeded_ReportDone if the byte at SavedSourceByte is not C0. | ||
| AB3A | CP $C0 | |||
| AB3C | JR NZ,CopyDisplayIfNeeded_ReportDone | |||
| AB3E | LD A,$B0 | Jump ahead to CopyDisplayIfNeeded_ReportDone if D is not B0. | ||
| AB40 | CP D | |||
| AB41 | JR NZ,CopyDisplayIfNeeded_ReportDone | |||
| AB43 | LD A,$02 | Leave 02 as the result. | ||
| AB45 | AND A | Clear the borrow so the script reads the result as success. | ||
| AB46 | RET | Return. | ||
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See whether bit 3 of the low byte of the source is set, then read the pointer at the object Processing Source Flag, then record the pointer in the object Processing Source Flag.
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| StartPictureModeScreenIdle_TestBitLowByte | AB47 | BIT 3,E | Go to ApplySavedClause if bit 3 of this byte is clear. | |
| AB49 | JP Z,ApplySavedClause | |||
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