Installed a firewire/1394 card into Win 10 machine and I see it in Device Manager but when we plug a working turned on firewire cam (Sony PD150) into the port... nothing. Searching the net I see we should roll back the 1394 drivers to the 1394 "Legacy" drivers... but the "Legacy" drivers do not appear as an option under 1394 device properties/drivers/update drivers
Someone suggested we tell it to let us find the drivers on the PC but again the word "Legacy" does not appear at the end of any 1394 drivers the Win 10 machine can see.
Anyone know how we can find the right drivers from either Sony or Microsoft or some other trusted source?

Thanks for any help.