The  house I lived in for the first 14 years of my life initially had an unfinished  basement. Shortly after my sister was born, my parents decided to turn the  basement into a rec room. When it was complete it had carpet with checkerboards  and hopscotch grids dyed right in, a pool table, one of those old “console”  stereo systems, and a groovy set of white leather “barrel” chairs. But the piece de resistance of the rec room was  the touch tone telephone. Although touch tone phones were fairly common in  corporate settings, it was truly novel to have one back in your home back in  1976. Friends and family came over to see the new rec room yet spent most of  their time playing around with the phone. Kids from the neighborhood came over  just to monkey around with the newfangled phone and its 12 buttons.
  			Although home phones have changed greatly in the past  			thirty years, most touch tone phones still come with the same 12  			buttons that the phone in 1976 had. But some folks with military  			experience might remember a time when some touch tone phones  			had 16 buttons. Those phones were part of the military’s nuclear  			weapon-proof  			Autovon network:
  			
  			Autovon stood for “automatic voice network” and was  			deployed in the United States, the United Kingdom, Panama, Asia and  			the Middle East. Although there have long been rumors about Autovon  			cables being buried in concrete shafts deep underground, in fact  			much of the system was buried in simple dirt 30 feet or so below the  			street surface. The system used a variety of means to achieve its  			“nuclear weapon proof” status, such as building in redundancies via  			satellite and microwave. But perhaps the most interesting feature of  			the system was the calling priority feature, and that’s where the 4  			extra buttons come in.
  			To make a basic phone call, the user would simply  			pick up the phone and dial the number. But if the user had some  			vital information that absolutely, positively had to get  			through, he could press one of the red buttons before dialing to  			assign a priority to the call. The priorities (in ascending order)  			were P (Priority), I (Immediate), F (Flash) and FO (Flash Override).  			So, for example, when a “Priority” phone call reached an exchange, a  			“regular” phone call would be dropped (if necessary) to allow the  			priority call to go through. Multiple levels of call priority were  			needed because of the expected deluge of calls to telephone  			exchanges in Washington DC and other important areas in the event of  			a nuclear attack. So a major on a “Priority” call with some  			important but not critical information could get bumped by a  			general with crucial information on an “Immediate” call. The most  			interesting option of all is (of course) “Flash Override” – a  			priority that was strictly limited in its use to the President and  			members of the National Command Authority. As you might guess, Flash  			Override trumped any and all 			traffic on the network; Flash Override was designed to allow the  			President to get his call through no matter what.
  			Although the system has long since been replaced,  			it’s still fascinating to read about it (check out the  			 			Wikipedia article or  			 			this site dedicated to the Autovon system for more details).  			It almost makes me wish I had my own Autovon system – wouldn’t that  			have come in handy for calling TicketMaster when Madonna tickets  			went on sale?