Seth Robertson (seth@ctr.columbia.edu) has written Xkernel; the current
version [1.4 as of 8/91, 2.0 expected RSN] is on sol.ctr.columbia.edu
[128.59.64.40] in /pub/Xkernel.gamma. It turns a Sun 3/50 into a pseudo- X
terminal; most of the overhead of the operating system is side-stepped, so it
is fairly fast and needs little disk space.

A similar approach is to run the regular X server by making /etc/init a shell
script which does the minimal setup and then invokes Xsun, like this example
script from mouse@larry.mcrcim.mcgill.EDU:

#! /bin/sh
exec >/dev/console 2>&1
/etc/fsck -p /dev/nd0
case $? in
 	0)	;;
 	4)	/etc/reboot -q -n
 		;;
 	8)	echo ND fsck failed - get help
 		/etc/halt
 		;;
 	12)	echo Interrupted
 		/etc/reboot
 		;;
 	*)	echo Unknown error in reboot fsck - get help
 		/etc/halt
 		;;
esac
/bin/dd if=/tmp-fs of=/dev/nd2 bs=512 count=128 >/dev/null 2>&1
/etc/mount /dev/nd2 /tmp
/etc/ifconfig le0 netmask 255.255.255.0 broadcast 132.206.41.255
/etc/mount -o ro apollo:/u2/x11/lib /local/lib/X11
/etc/route add default 132.206.41.1 1 >/dev/null
set `/etc/ifconfig le0`
exec /Xsun -once -multidisp -mux -query \
	`(sh -vn </local/lib/X11/xdm-servers/$2 2>&1)`