Hi:
Problem: Whenever I plug-in or out a serial cable from Sun 220 Server it resets itself and gives me OK prompt. I need to use one dumb terminal for two 220s.
Any suggestions or comments will be highly appreciated.

This was not for 220s specifically.

This can be accomplished in many ways. Some of the recommended methods
are discussed below.

1.The file /etc/default/kbd can set a variable called KEYBOARD_ABORT.
Uncomment the line containing this variable in this file as shown below:

KEYBOARD_ABORT=disable

Then run the command "kbd -i" or simply reboot the system.The "kbd -i"
command will force the system to reread the /etc/default/kbd file.

This will permanently disable all the STOP+A and serial device break
signals on the system.

You can re-enable the break sequence by commenting out this line in the
/etc/default/kbd file and rebooting the system or running the "kbd -i"
command again.

2. You can enable/disable breaks with out changing any file entries
from the command line as well.

The " kbd -a enable" will enable the system to start accepting the
break signal and the "kbd -a disable" will disable the system from
accepting the break signal. These changes will be temporary and
be in effect only till the system reboots.

3. You can also reboot the system after setting the following variable
in /etc/system file as shown:

set abort_enable=0

This will disable all break signals on the system.

Solaris 8 introduced a new feature which gives the system the
ability to force a hanging system to halt when required, without
allowing random or spurious Breaks to cause an unintentional stop. The
new sequence to stop the system is <RETURN> <TILDE> <CONTROL B>.There
must be an interval of more than 0.5 seconds between characters, and
the entire string must be entered in less than 5 seconds. This is true
only with serial devices acting as consoles and not for systems with
keyboards of their own.

This feature has been backported to Solaris 2.6 and Solaris 7 as well. The
patch 105924-10 for Solaris 2.6 and 107589-02 or higher for Solaris 7 is
required to enable this feature.

To enable the alternate boot sequence, just type "kbd -a alternate" or
if this change needs to be permanent, reboot the system after
uncommenting the following line in the /etc/default/kbd file :

KEYBOARD_ABORT=alternate

Note: a) Do not uncomment the KEYBOARD_ABORT=disable line while doing this.
b) Do not set abort_enable=0 in /etc/system while doing this.

It worked,
Thanks a lot for your valuable information.