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C74C: The middle of an east or west arch
Used by the routine at adj_m3_p1.
The other pillar is 13 further along y; the doorway is 15 deep (along x) and 6 either side of the middle (along y).
arch_ew_doorway C74C CALL set_pixel_adj the drawing offset in HL
C74F LD A,(IX+$02) y of the middle: this pillar's y + 13
C752 ADD A,$0D
C754 LD (IX+$0A),A
C757 LD A,(IX+$01) x of the middle: this pillar's
C75A LD (IX+$09),A
C75D LD HL,$060F the doorway: x within 15, y within 6
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