I'm less concerned about someone from a thousand years ago, as I am about me. COVID21 (or nukes or insert your favorite apocalypse) sweeps through and wipes out

I'm less concerned about someone from a thousand years ago, as I am about me. COVID21 (or nukes or insert your favorite apocalypse) sweeps through and wipes out 90% of mankind. We instantly lose our ability to manufacture ICs, which rely on a complex tech tree and supply chain to feed many-billion-dollar fabs. We'd like to continue to be able to: - Control industrial machinery - Communicate with each other - Balance out bank accounts - Etc. 1996-era computers can do almost everything 2021-era computers can do from the perspective of keeping society running. I won't have 3d games or machine learning, but accounting, word processing, and similar are fine. Most of the changes in the past quarter-century were in how we use computers, more so than fundamentals. Having a cache can mean the difference between being set back 1000 years due to systemic collapse, or being set back 50 years. This isn't a time capsule thing. This is about immediate, operational resilience when the last of my computers breaks without supply chains.