This patch provides reliable hardware handshake (RTS/CTS) for
the builtin serial lines of all Sun3's under SunOS 4.1.1.

The problem is mentioned in every jumbo tty patch, but despite
they promised it, Sun aparently never fixed this bug.

This is only a software problem, because Sparcs (which use the same
ol' Zilog 8350 chips than the Sun3's) under Solaris CAN do hardware
handshake (and of course NOT under SunOS 4.1.X).

Hint: You should install the latest jumbo tty patch (100513-04) before.

Many thanks to Brian Katzung (katzung@katsun.chi.il.us) for fixing
this annoying problem.
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To install this patch, type as root:
	mv /sys/`arch -k`/OBJ/zs_async.o /sys/`arch -k`/OBJ/zs_async.o.old
	cp `arch -k`/zs_async.o /sys/`arch -k`/OBJ

Build a new kernel:
	cd /sys/`arch -k`/conf
	setenv KERNELNAME `cat /etc/motd | sed -e "s/.*(//" | sed -e "s/).*//"`
	config $KERNELNAME
	cd ../$KERNELNAME
	make

Install the new kernel:
	mv /vmunix /vmunix.old
	mv vmunix /
	reboot
