Some time ago I asked about redesigning computer from scratch in post-apocalyptic setting. Nevertheless such approach may seem a bit like reinventing the wheel... So I'd try to look at the same issue from a bit different perspective...
Which computer related technologies would have the highest chance to leave useful blueprints that can be used in a post-apocalyptic project to rebuild computer industry? The technology would not have to be be the best, just has highest chance to survive in useful, modifiable form.
1) Software... for me it seems that the highest chance to survive would have some Linux distribution including Android. All main competitors would have low chance to leave a source code. Presumably also a few closed code programs would survive and be run through some Wine equivalent. (or do I miss something?)
2) Hardware: Processor - some variant of RISC ARM... the most popular architecture, and some of them are even open source hardware. Plus if it is supposed to be simple and ultra high performance, then anyway RISC is presumably the way to go. (the rest of hardware - I have simply no idea. Any idea what has the best chance to leave blueprints... USB? RAM? HDD?)
I asked about Raspberry Pi, because it seems as something simple enough but working as a computer. Nevertheless, maybe there would be something with higher chance to leave blueprints or similar chance but being of higher quality?