[GreenKeys] Re: Teletypewriters

[Don Robert House]

Thanks Ben,
Fascinating!
Don


>As I recall, the 83B was the biggie workhorse.
>
>But there was another obscure switching system developed by Teletype 
>for the Indiana State Police.  It was in a couple of seven foot 
>racks, and ran on crossbar switches and wire spring relays.  I seem 
>to recall a teletype selector or two in the bottom to read the 
>Baudot code addresses.
>
>Called, TASP (Teletype Automatic Switching Package), it was a line 
>switcher, not a party line selective calling system.  The switch 
>matrix converted the signals from normal neutral signalling into 
>inverse neutral, that is, no-current is a mark and current is a 
>space.  This allowed the switch to open and close circuits without 
>the machines out in the field running "open".    I don't know 
>whether this was done through the Bell System, Western Union, or 
>directly with the Indiana State Police.   We built it, shipped it, 
>and I never heard about it after that.=
>
>Ben Stephens=
>NNNN