[COFF] Tonight's epiphany

[Bakul Shah]

Companies like Wave Computing built devices using NCL
(null convention logic) which are self-timed. If you
vary temp & voltage, results may come slower or faster
but always correct. There is even a clockless RISC-V
design called Aristotle. But there may be practical
issues that could've made bringing this technology to
market difficult. scj can tell you more as he was
involved in Wave Computing.

There may be other companies but I have not kept track.

> On Jan 26, 2022, at 7:32 PM, Larry McVoy <lm at mcvoy.com> wrote:
> 
> I'm still waiting for the self timed logic I was taught in the 1980s.
> Does anyone know why that is not a thing?  It seemed smart back then.
> 
> On Wed, Jan 26, 2022 at 07:00:52PM -0800, Bakul Shah wrote:
>> 
>> 
>>> On Jan 26, 2022, at 6:09 PM, Adam Thornton <athornton at gmail.com> wrote:
>>> 
>>> "Reflections on Trusting Trust" plus the fact that no one has designed new real computers at the gate level for at least 30 years, maybe longer--it's done in an HDL of some kind, which is to say, software--means it's already way, way too late.
>> 
>> https://arith-matic.com/notebook/4bit-7400-homebrew-computer-cpu
>> https://eater.net/8bit/
>> http://cpuville.com/Projects/Original-CPU/Original-CPU-home.html
>> 
>> Then there are people like Ken Shiriff who are revese
>> engineering from die photos of a chip!
>> https://www.youtube.com/watch?v=aHx-XUA6f9g
>> 
>> Of course, you may need some machine learning to reverse
>> engineer a modern chip with bilions of transistors to see
>> if some surreptitious logic was sneaked in!
>> 
>> You may need some way to prove the manufactured chip is
>> exactly what was specified. Probably impossible today.
>> 
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> -- 
> ---
> Larry McVoy            	     lm at mcvoy.com             http://www.mcvoy.com/lm