Routines
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43824: Raise Rope
Used by the routine at Update_Rope.
Makes the rope shorter by two, which raises Sabreman. The length never gets below 32.
When the length falls to a multiple of 128 he is at the top of the room. The length is then made shorter by two more, the second byte of the world map entry of the room is cleared, Sabreman moves up to the room above and the room is drawn.
Input
A Controls
HL Length of the rope
IX Object record of Sabreman
Raise_Rope 43824 PUSH AF Keep the controls on the stack.
43825 LD A,H Copy the high byte of the length to A.
43826 AND A Jump to Raise_Rope_Shorten if the length is more than 255.
43827 JR NZ,Raise_Rope_Shorten
43829 LD A,L Copy the low byte of the length to A.
43830 CP 32 Jump to Lower_Rope_Store_Length if the rope is already at its shortest (the length is less than 32).
43832 JR C,Lower_Rope_Store_Length
Raise_Rope_Shorten 43834 DEC HL Make the length of the rope shorter by two.
43835 DEC HL
43836 LD A,L Copy the low byte of the length to A.
43837 AND %01111110 Keep only bits 1 to 6.
43839 JR NZ,Lower_Rope_Store_Length Jump to Lower_Rope_Store_Length if the rope has not reached the top of the room (the length is not a multiple of 128).
43841 DEC HL Make the length shorter by two, to raise the rope into the room above.
43842 DEC HL
43843 LD (43685),HL Store the new length of the rope.
43846 CALL Find_World_Map_Address Find the address of the world map entry of the room.
43849 INC HL Point at the second byte of the entry.
43850 LD (HL),0 Clear the second byte of the entry.
43852 DEC (IX+4) Move Sabreman up to the room above.
43855 CALL Draw_Room Draw the new room.
43858 POP AF Fetch the controls again from the stack.
43859 RET Return.
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