I wonder how things were done in this thing: https://en.wikipedia.org/wiki/Sun386i

Was that DOS emulation running some real DOS that though it was invoking BIOS calls?

According to a HN submission 3 years ago, evidently, Peter Norton once wrote a book on the 386i:

https://www.amazon.co.uk/exec/obidos/ASIN/0136616127/ref%3Dn...