Pragmatic Semiconductor made a flexible version of the 6502 processor (2021)
pragmaticsemi.com
pragmaticsemi.com
They claim [1] to be able to make chips from a new design in only ~4 weeks compared to the usual 3-6 months required by anyone else, which is huge for R&D. They manage this by using an unusual relatively low-performance process (which is also what allows them to use plastic substrates), but it's arguably a worthwhile tradeoff (in return for slower larger transistors, you get significantly lower equipment cost and lead times). That the chips are flexible is almost an afterthought, I think, albeit a nifty one.
They've also announced efforts [2] toward open-sourcing their PDK, joining the growing movement toward open source chip design.
[1] https://www.pragmaticsemi.com/foundry [2] https://www.pragmaticsemi.com/newsroom/blogs/democratising-i...
The 6502 seems to be a technology demonstrator that has no commercial application, as there’s no corresponding low cost power supply for their parts. Because polymer semiconductors are only about 1% efficient, it takes way more power than an energy harvester could supply.
[1] https://www.theverge.com/2021/7/23/22590001/arm-plasticarm-c...