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C76C: The first pillar, mirrored: a north or south arch
Used by the routine at upd_2_4.
X -17, Y -2. The other pillar is 13 back along x; the doorway is 15 deep along y and 6 either side along x.
adj_2_4_hflip C76C LD HL,$FEEF the drawing offset
C76F CALL set_pixel_adj
C772 LD A,(IX+$01) x of the middle: this pillar's x - 13
C775 SUB $0D
C777 LD (IX+$09),A
C77A LD A,(IX+$02) y of the middle: this pillar's
C77D LD (IX+$0A),A
C780 LD HL,$0F06 the doorway: x within 6, y within 15
C783 JR arch_check_doorway
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