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diff --git a/sys/fmio/fmlfawr.x b/sys/fmio/fmlfawr.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<mach.h>
+include	"fmio.h"
+
+# FM_LFAWRITE -- Asynchronous blocked write to an lfile.  The differences
+# between text and binary lfiles are not visible above this level; both
+# appear as binary files to FIO.
+
+procedure fm_lfawrite (lf, buf, nbytes, offset)
+
+pointer	lf			#I lfile descriptor
+char	buf[ARB]		#O input data buffer
+int	nbytes			#I nbytes to write
+long	offset			#I lfile offset
+
+int	status, nb
+pointer	sp, pk_buf
+
+begin
+	if (and (LF_FLAGS(lf), LFF_TEXTFILE) == 0)
+	    call fm_lfbinwrite (lf, buf, nbytes, offset)
+	else {
+	    call smark (sp)
+	    call salloc (pk_buf, nbytes / SZB_CHAR, TY_CHAR)
+
+	    # Wait for i/o to complete before freeing buffer!
+	    nb = (nbytes + SZB_CHAR-1) / SZB_CHAR
+	    call chrpak (buf, 1, Memc[pk_buf], 1, nb)
+	    call fm_lfbinwrite (lf, Memc[pk_buf], nb, (offset-1)/SZB_CHAR+1)
+	    call fm_lfbinwait (lf, status)
+
+	    call sfree (sp)
+	}
+end