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diff --git a/sys/vops/ak/achtrd.x b/sys/vops/ak/achtrd.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# ACHTxy -- Change datatype of vector from "x" to "y" (doubly generic).
+# The operation is performed in such a way that the output vector can be
+# the same as the input vector without overwriting data.
+
+procedure achtrd (a, b, npix)
+
+real	a[ARB]
+double	b[ARB]
+int	npix
+int	i
+
+begin
+		do i = npix, 1, -1
+			b[i] = a[i]
+end