[GreenKeys] 1949 time division multiplex demo

[Harold Hallikainen]

On Tue, October 28, 2025 2:10 pm, Jim Cooper wrote:
> On 28 Oct 2025 at 13:17, Harold Hallikainen via GreenKeys
> wrote:
>
>
>> They did amazing stuff with mechanical and vacuum tube equipment.
>>
>
> But at least with that equipment it could be restored
> and/or reconfigured 50 years later ...
>
> who is going to be able to use anything from a surface-mounted and IC
> super-integrated chips in 50 years?   especially since almost everything
> now does its job with internal software which who would even know what it
> does in 50 years?
>
> w2jc

True! I designed stuff for the digital cinema industry. Projectors would
last 50 years or more. Now it is 10 to 1t years. A big part of the short
lifetime is end of life parts. If the projector or other equipment
manufacturer can't get the part, they can't support the equipment.

I had a real problem with displays going EOL. Since the volume in displays
is for consumer devices with very short production life, I was constantly
having to redesign for a different display. My firmware would probe the
display to figure out which one was out there and then run the appropriate
code.

Harold
https://w6iwi.org


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