A cheap and simple ARM chip (think IoT applications) that can access Bios and output via one of the mainboard's display connectors. Why?
- Proper, detailed diagnostics, no beep beep / codes and guessing around
- Flash BIOS without need for a compatible CPU (think AM4)
- Change BIOS settings without need to reset via jumper (OC, testing for stability etc.)
Also,These days server BMCs allow you to dump huge amounts of data from CPU registers on crashes, allow you to update BIOS and verify bios signatures before upgrades, change settings, reset CMOS, etc. etc. That's for Intel anyway, I don't think AMD supports as much of the diagnostics side.