Routines
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CB29: Line up in U with an arch in a wall of constant V
Used by the routines at FIND_ENTRY_ARCH and ARCH_AT_HIGH_V.
U of the arch's middle, 13 back from the first pillar; then Z (ALIGN_V_TO_ARCH).
Input
IY The first pillar
IX The player's legs
ALIGN_U_TO_ARCH CB29 LD A,(IY+$01)
CB2C SUB $0D
CB2E LD (IX+$01),A
CB31 JR ALIGN_Z_TO_ARCH
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