As Student Apprentice in the 1960's I rewired a big (Great Western Railway) wartime eletromechanical PABX. Now that was interesting. You could see the precursors to modern computing. There really was relay logic in there. Rod Smallwood -----Original Message----- From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org] On Behalf Of woodelf Sent: 19 September 2007 22:01 To: On-Topic and Off-Topic Posts Subject: Re: Subject: Re: 8-bitters and multi-whatever Roy J. Tellason wrote: Some very tricky relays. That is why you have 1 for long distance. I had a book about that -- 1940's ( but it got lost ) and the big thing was automatic dialing. I am not sure but I think on the old non dial phones you could even back then dial your number by tapping the hook on the phone. Ben.