[GreenKeys] More 28ASR K-KT-T madness

[Jim Haynes]

On Wed, 19 Feb 2020, Nick England wrote:

> There were TSEC/KW-7 crypto units aboard and I know that had a step pulse
> output to synchronize the TTY characters. 
> 
> A quick explanation for folks not familiar with step control of the M28
> keyboard and TD.

Many years ago I bought on surplus three racks of equipment.  Two of them
contained regenerative repeaters, and one contained TD steppers.