Routines
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D1B2: Check if the lift has reached the top or bottom
Used by the routines at CC89 and D16F.
Input
B Lift flags
C Current wait time
D Current room
E Current Y co-ordinate
See if the lift has reached the bottom.
D1B2 LD A,D Is the lift in room 05? (6A22)
D1B3 CP $05
D1B5 JR NZ,$D1BE Jump if not.
The lift has reached the bottom room.
D1B7 LD A,E Get the Y co-ordinate.
D1B8 CP $48 Is it the lowest one?
D1BA JR NZ,$D1BE Jump forward if not.
D1BC JR $D1C6 Otherwise reverse direction.
See if the lift has reached the top.
D1BE LD A,D Is the lift in room 2D? (6C02)
D1BF CP $2D
D1C1 RET NZ Return if it isn't, nothing to do in this room.
The lift has reached the top room.
D1C2 LD A,E Get the Y co-ordinate.
D1C3 CP $40 Is it the highest one?
D1C5 RET NZ Return if it isn't.
The lift has reached the bottom or the top and needs reversing direction.
D1C6 LD C,$64 Set the wait time back to 64.
D1C8 LD A,B Invert the direction flag.
D1C9 XOR $01
D1CB LD B,A
D1CC RET Return.
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