The second main bootscript is the rcS script. Create a new file /etc/init.d/rcS containing the following:
cat > rcS << "EOF"
#!/bin/sh
# Begin /etc/init.d/rcS
runlevel=S
prevlevel=N
umask 022
export runlevel prevlevel
trap ":" INT QUIT TSTP
for i in /etc/rcS.d/S??*
do
[ ! -f "$i" ] && continue;
$i start
done
# End /etc/init.d/rcS
EOF