Routines
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CB0E: Leave by the north wall?
Out if the south edge after the move is at or past the north wall at $80 plus the Y half-size. Y becomes the marker $FF (arrive at the south wall) and the room number goes up a row, 16.
Input
HL the room's half-sizes (pushed by handle_exit_screen)
screen_north CB0E POP HL H = the north wall
CB0F LD A,H
CB10 ADD A,$80
CB12 LD H,A
CB13 LD A,(IX+$02) Y + dY - half-depth short of it: stay
CB16 ADD A,(IX+$0A)
CB19 SUB (IX+$05)
CB1C CP H
CB1D RET C
CB1E LD (IX+$02),$FF arrive at the south wall
CB22 LD A,(IX+$08) room + 16
CB25 ADD A,$10
CB27 JR exit_screen
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