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diff --git a/sys/memio/msvfwa.x b/sys/memio/msvfwa.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# MSVFWA -- Determine the buffer address which satisfies the maximum alignment
+# criteria, save the buffer fwa in the integer cell immediately preceding
+# this, and return a pointer to the user area of the buffer.
+
+pointer procedure msvfwa (fwa, dtype, sz_align, fwa_align)
+
+int	fwa, dtype, sz_align, fwa_align
+pointer	bufptr, mgdptr()
+int	coerce()
+
+begin
+	# Compute the pointer to the data area which satisfies the desired
+	# alignment criteria.  Store the fwa of the actual OS allocated buffer
+	# in the integer cell preceeding the data area.
+
+	bufptr = mgdptr (fwa, TY_INT, sz_align, fwa_align)
+	Memi[bufptr-1] = fwa
+
+	# Return pointer of type dtype to the first cell of the data area.
+	return (coerce (bufptr, TY_INT, dtype))
+end