Glass memory?

[Joshua Rice]

From: "steven--- via cctech" <cctech at classiccmp.org>
Paul and others said
What if you can't make ICs any more? Or rather, what level of IC
fabrication would it be possible to construct from scratch?
For semiconductors, you'd start with machinery to make ultra-pure 
materials (silicon, I'd assume).  A Czochralski crystal growing machine 
to make
the cylinders of pure mono-crystal silicon from which wafers are sliced. 
Polishing machinery.  Wafer coating machines.  Wafer steppers.  Etching,
metal coating, diffusion, etc......... most of which also require very 
pure and often exotic ingredients.  (I remember being amazed to read 
that
chlorine trifluoride is used as a cleaner in the semiconductor industry. 
Look up the properties of that compound, it will blow your mind.)
Which brings to mind the amazing work of Sam Zeloof:
https://www.youtube.com/results?search_query=zeloof+z1+chip 
<https://www.youtube.com/results?search_query=zeloof+z1+chip>


It really depends on how "from scratch" we have to go. In a more real 
world scenario where the ability to make large, low density MSI chips in 
the micrometer scale is somehow lost through scrapping and ignorance, 
recreating the machines required to make them on an industrial scale 
shouldn't cost a huge amount. It's proof, that if someone can make these 
chips in his garage on a shoestring budget, a few hundred grand should 
be able to recreate the technology in order to reproduce them 
industrially. Obviously there'd be an iterative process, much like 
happened in history, to shrink the die process if you were indeed trying 
to get smaller.

However, if we had some sort of massive scale Carrington event (or 
larger) that fried every IC ever made, things would definitely take a 
step back. I imagine that the large crystal-growing tanks themselves 
would be fine, but the control gear etc would be truly sent back to the 
dark ages. It might take 5 years or more to re-engineer all the control 
gear to work in an electricity-free (or at least IC free) world, with 
many other things like food, water and fuel supplies taking precedence. 
Then there's the task of re-engineering the IC production from paper 
copies of research papers and documentation (no internet, remember), 
which could prove rather difficult to duplicate and distribute without 
photocopiers. We'd essentially be taken back to the early 60's when it 
came to IC production, having to re-engineer everything from scratch. 
Much of the non-electronic machinery and R&D would still be available, 
so i imagine getting back to where we are now would only take 20 or 30 
years, instead of 60, but it would still be a long and iterative process 
which would be likely hampered by the whole "end-of-the-world 
Armageddon" thing the Carrington-scale event would have caused. I 
imagine most people would be worried about putting food in their bellies 
and keeping warm, rather than worrying about getting their Exchange 
server working.

I think i may have overthought this.

Josh Rice