Anyone know where to get started on rebuilding a BIOS? I've got a HP dc5700 sff and I wanna use the ADD2 slot as a PCI-E slot. I don't see a reason it physically can't work, so it must be a limitation of the BIOS. This is my learning machine so if I kill it I kill it.

#retrocomputing #custombios
@NoraBell ADD2 port is SDVO (Serial Digital Video Out) and it's mapped into on-board graphics. It might look like PCI-E x16 but it's not. Modding BIOS won't work.
@branch300bpm

I had a feeling that's where this would end up.

Dremel to the 1x slot it is