Routines
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C722: The second pillar of an arch (types 3 and 5)
An arch is two pillars, built together from one background entry (background_type_tbl). This one only needs its drawing offset: X -9, Y -3, or X -7, Y -2 when mirrored. The work of the doorway is done by the other pillar (upd_2_4).
Input
IX the pillar's record
upd_3_5 C722 BIT 6,(IX+$07) mirrored for the arches in the north and south walls
C726 JR NZ,adj_3_5_hflip
C728 LD HL,$FDF7
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