Does this mean that UBCD would work even on 16-bit 8086 computers with only 640KB of memory?
I'd really like to know what is the minimum supported processor.
The Linux-based tools definitely won't, since Linux requires a 386. The FreeDOS-based tools should do, though. From the FreeDOS FAQ
FreeDOS FAQ wrote:
... FreeDOS should run on all PC's. That means you can run FreeDOS on your Pentium-Pro 800Mhz. It will just run really fast. You should also be able to run FreeDOS on your 5MHz PC-XT. It will just run a little slow.
FreeDOS will run on all levels of PC's, from as low as an XT with 640k memory. We may one day expand the project to support 32-bit extensions such as protected memory or multi-tasking, but for now we are content with supporting the lower systems.
All of this information, and more, is spelled out in the FreeDOS Manifesto.