Routines
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CB29: Leave by the south wall?
Out if the north edge after the move is south of the south wall at $80 less the Y half-size. Y becomes the marker 0 (arrive at the north wall) and the room number goes down a row.
Input
HL the room's half-sizes (pushed by handle_exit_screen)
screen_south CB29 POP HL H = the south wall
CB2A LD A,$80
CB2C SUB H
CB2D LD H,A
CB2E LD A,(IX+$02) Y + dY + half-depth still at or beyond it: stay
CB31 ADD A,(IX+$0A)
CB34 ADD A,(IX+$05)
CB37 CP H
CB38 RET NC
CB39 LD (IX+$02),$00 arrive at the north wall
CB3D LD A,(IX+$08) room - 16
CB40 SUB $10
CB42 JP exit_screen
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