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Routines |
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Used by the routine at InitialiseDisplayBuffer.
Stores the result in the display, then clears the mark on this character.
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| ProcessDisplayPointer | B39D | PUSH IY | Read the word at IY+00-01 into HL, keeping IY. | |
| B39F | LD L,(IY+$00) | |||
| B3A2 | LD H,(IY+$01) | |||
| B3A5 | LD A,H | Read the high byte of the pointer. | ||
| B3A6 | AND $80 | Keep bit 7. | ||
| B3A8 | LD ($B39C),A | Record the result in the display flag at B39C. | ||
| B3AB | RES 7,H | Clear the top bit of the pointer. | ||
| B3AD | LD ($B186),HL | Store the pointer at B185+01 and read the low byte at IY+02. | ||
| B3B0 | LD L,(IY+$02) | |||
| B3B3 | LD H,(IY+$03) | Read the high byte at IY+03. | ||
| B3B6 | LD ($B18C),HL | Store that word at B18C and push the pointer at B188. | ||
| B3B9 | LD HL,$B188 | |||
| B3BC | PUSH HL | |||
| B3BD | LD B,$04 | Take 04 bytes for ClearBuffer to clear. | ||
| B3BF | CALL ClearBuffer | Call ClearBuffer to clear buffer. | ||
| B3C2 | POP HL | |||
| B3C3 | LD B,$02 | Take 02 bytes and call CopyCharacterDisplay to copy the character into the display. | ||
| B3C5 | LD E,$04 | |||
| B3C7 | CALL CopyCharacterDisplay | |||
| B3CA | LD E,$0E | Take 0E and call CopyCharacterDisplay to copy the character into the display. | ||
| B3CC | CALL CopyCharacterDisplay | |||
| B3CF | LD E,$06 | Take 06 and call CopyCharacterDisplay to copy the character into the display. | ||
| B3D1 | CALL CopyCharacterDisplay | |||
| B3D4 | LD E,$10 | Take 10 and call CopyCharacterDisplay to copy the character into the display. | ||
| B3D6 | CALL CopyCharacterDisplay | |||
| B3D9 | XOR A | Clear the byte at LocationMatchFlag and point HL at ObjectTablePointer+08. | ||
| B3DA | LD ($A02E),A | |||
| B3DD | LD HL,$B186 | |||
| B3E0 | LD DE,$0008 | Take a length of 08 entries. | ||
| B3E3 | LD IX,$8259 | Use the object runtime table (8259). | ||
| ProcessDisplayPointer_Loop | B3E7 | PUSH IX | Use the character record as the schedule entry. | |
| B3E9 | POP IY | |||
| B3EB | CALL CompareLocationData | Call CompareLocationData to compare location data. | ||
| B3EE | JR Z,ProcessDisplayPointer_Next | Go to ProcessDisplayPointer_Next if the room fields match. | ||
| B3F0 | ADD IX,DE | Step to the next display entry. | ||
| B3F2 | LD A,(IX+$01) | Go back to ProcessDisplayPointer_Loop if this object word is not zero. | ||
| B3F5 | OR (IX+$00) | |||
| B3F8 | JR NZ,ProcessDisplayPointer_Loop | |||
| B3FA | POP IY | Restore the saved schedule entry from the stack. | ||
| B3FC | RET | Return. | ||
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Restores the character, swaps the display pointers, and leaves a non-zero result.
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| ProcessDisplayPointer_Next | B3FD | POP IY | Restore the saved schedule entry from the stack. | |
| B3FF | CALL SwapObjectDisplayPointers | Call SwapObjectDisplayPointers. | ||
| B402 | OR %00000001 | Reset the zero flag. | ||
| B404 | RET | Return. | ||
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View the equivalent code in;
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| Prev: B39C | Up: Map | Next: B405 |