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diff --git a/noao/mtlocal/lib/cyboow.x b/noao/mtlocal/lib/cyboow.x
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+# CYBOOW, CYBOEW -- Order the bits in an odd or even indexed 60-bit Cyber word.
+# The operation may not be performed in-place.  The offsets and sizes of the
+# bit segments which must be moved are as follows:
+#
+#	 --> Odd Words <--	        --> Even Words <--
+#       [from]   [to]  [nbits]
+# 	 1	53	8		-3	57	4
+# 	 9	45	8		5	49	8
+# 	17	37	8		13	41	8
+# 	25	29	8		21	33	8
+# 	33	21	8		29	25	8
+# 	41	13	8		37	17	8
+# 	49	 5	8		45	 9	8
+# 	61	 1	4		53	 1	8
+#
+# Input bit-offsets must be a multiple of the Cyber word size, i.e., 1, 61,
+# 121, etc.  An output word may begin at any bit-offset.
+
+
+# CYBOOW -- Order odd cyber word.  After swapping the first 8 bytes of IN the
+# ordered 60-bit Cyber word is in bits 5-64 of the temporary storage area at W.
+
+procedure cyboow (in, inbit, out, outbit)
+
+int	in[ARB]
+int	inbit
+int	out[ARB]
+int	outbit
+
+begin
+	call error (1, "Cyber readers have not been implemented")
+end
+
+
+# CYBOEW -- Order even cyber word.  After swapping the 8 bytes the ordered
+# Cyber word will be found in bits 1-60 of the temporary storage area at W.
+
+procedure cyboew (in, inbit, out, outbit)
+
+int	in[ARB]
+int	inbit
+int	out[ARB]
+int	outbit
+
+begin
+	call error (1, "Cyber readers have not been implemented")
+end