I found what seemed to be a good Intel x86 based SBC over at https://up-shop.org/up-squared-series.html but there was one problem. It mentioned only a UEFI firmware. Nothing about supporting legacy BIOS. I know my laptop can switch between UEFI and BIOS by changing the firmware settings (go into the firmware menu by pressing F2 at bootup). But the lack of mention of legacy BIOS support worried me. So I emailed them and asked. And unfortunately, as I was worried, this was their answer: "For the product now it’s all supported with UEFI BIOS. No legacy BIOS supported."
So, I would like to run DOS on an SBC, but with a UEFI only system, that's not possible.
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