[GreenKeys] TTY hardware

[Jim Haynes]

On Mon, 23 Sep 2024, Nick England wrote:

> Used in a tape relay center to transmit outgoing messages with each TD
> connected to a line to a different destination. 
> 
It was also fairly common to have two TD heads feeding the same outgoing
trunk, arranged so that only one at a time could transmit.  This allowed
the sending operators to have at least two outgoing messages in queue
for transmission without any need to attend to the machines once the
tapes were loaded on. 
---

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