Re: Positional/physical addressing

On 6/26/2025 1:59 AM, Liz Tuddenham wrote:

This is too "high tech".  You're effectively trying to build a TDR into
each device.  Recall, I want these to be dirt cheap because I use so
many of them in a system.

 
Actually the individual devices just need to store the time between two
clear digital pulses as a number.  If the devices are never closer than
one yard apart, a 300 Mc/s clock speed will be sufficient to distinguish
between them.  (The twin identification pulses will be spaced by double
the path length.)

 
Sorry, this is a *display*.  Even as oversized as it is (a few
square feet), it is quite possible that devices will be immediately
adjacent -- a fraction of an inch apart.