You probably don't think twice about the electricity that supplies the power
for your computer.  Maybe you should.

Voltage sags and surges are always present in the electricity supplied to
your computer.  Normally it can handle these because they are relatively
minor and the computer tolerance is generally about 10% (depending upon
which machine you are using).  There is also some over-voltage and
over-current protection provided in the system power supply.  The power
problem that can get you is a transient surge that can fry the system before
the sensing logic knows what has happened.

Power line problems can be caused by something on the same electrical circuit
or on other circuits, so dedicated power to the computer is not totally
satisfactory insurance.

In late 1983 and early 1984 there were many articles written in various
computer magazines about power line problems and how to fight them.  One of the
best in my opinion was by Steve Ciarcia in BYTE, December 1983, where he
gave a good description of the problem and various levels of protection
available.  The article also showed how to modify a power bar to provide a
level of protection equal to many commercial products for as little as $2
(that's right, TWO)!  Do some reading about power problems and see if you
should be considering some sort of protection.
NOTE **  Keep your eye on the weather.  If electrical or wind storms are
         predicted, unplug your computer and do something else.

      MODE [n][,m][,T]

The inpu