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Routines |
Prev: 35515 | Up: Map |
Used by the routine at 35515.
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35770 | LD C,L | Point BC at the bottom row of pixels of the crumbling floor tile in the screen buffer at 28672 | ||||||||
35771 | LD A,H | |||||||||
35772 | ADD A,27 | |||||||||
35774 | OR 7 | |||||||||
35776 | LD B,A | |||||||||
35777 | DEC B | Collect the pixels from the row above in A | ||||||||
35778 | LD A,(BC) | |||||||||
35779 | INC B | Copy these pixels into the row below it | ||||||||
35780 | LD (BC),A | |||||||||
35781 | DEC B | Point BC at the next row of pixels up | ||||||||
35782 | LD A,B | Have we dealt with the bottom seven pixel rows of the crumbling floor tile yet? | ||||||||
35783 | AND 7 | |||||||||
35785 | JR NZ,35777 | If not, jump back to deal with the next one up | ||||||||
35787 | XOR A | Clear the top row of pixels in the crumbling floor tile | ||||||||
35788 | LD (BC),A | |||||||||
35789 | LD A,B | Point BC at the bottom row of pixels in the crumbling floor tile | ||||||||
35790 | ADD A,7 | |||||||||
35792 | LD B,A | |||||||||
35793 | LD A,(BC) | Pick up the bottom row of pixels in A | ||||||||
35794 | OR A | Is the bottom row clear? | ||||||||
35795 | RET NZ | Return if not | ||||||||
The bottom row of pixels in the crumbling floor tile is clear. Time to put a background tile in its place.
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35796 | LD A,(32800) | Pick up the attribute byte of the background tile for the current cavern from 32800 | ||||||||
35799 | INC H | Set HL to the address of the crumbling floor tile's location in the attribute buffer at 24064 | ||||||||
35800 | INC H | |||||||||
35801 | LD (HL),A | Set the attribute at this location to that of the background tile | ||||||||
35802 | DEC H | Set HL back to the address of the crumbling floor tile's location in the attribute buffer at 23552 | ||||||||
35803 | DEC H | |||||||||
35804 | RET |
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