There are at least three "real" 8086 BIOSes-- "real" as in they can work on actual hardware rather than just emulators-- available in source form, which might b

There are at least three "real" 8086 BIOSes-- "real" as in they can work on actual hardware rather than just emulators-- available in source form, which might be worth examining. https://www.phatcode.net/downloads.php?id=101 https://www.phatcode.net/downloads.php?id=101 -- this is a respin of code that apparently originated in the 1980s in sketchy Taiwanese clones, so I think some of the docs are reverse engineered http://glabios.org/ http://glabios.org/ is an all-new-still-under-development project, but it works well enough for my hobby usage. https://github.com/skiselev/8088_bios https://github.com/skiselev/8088_bios These are more targeted towards some specific hardware projects (Xi8088/Micro8088) Obviously, being for a simple 8086 mrans they don't have some of the complex chipset config used in a modern PC, and even stuff like "hard disc support" is outsourced (for that, you might consider stuff like the XT-IDE Universal BIOS)