UPDATES: I didn't mention but my Lab machine is running in Legacy BIOS mode (not UEFI) and had Option ROM support enabled. Also, it is impossible to plug a SATA power cable into the PCI adapter and plug a PCI card in at the same time -- they SATA connector keeps the card from being inserted.
------
In this video I try out an interesting PCI Express to PCI adapter. (From China, of course) I want to use a PCI SCSI card on a modern machine so I can access Amiga and Mac SCSI drives.