unreal mode

[skull-squadron]

Are there any MCEs of switching to unreal mode, e.g., flat addressing without protections?

1. Switch to protected mode
2. Tweak the GDT/LDT
3. Load CS from a descriptor that has D = 1
4. Switch back to real mode

[joncampbell123]

There's a DOSLIB library for flat real mode: https://github.com/joncampbell123/doslib/tree/master/hw/flatreal