I need a legacy drive (Caviar WD1600JB)

Well, no joy in Mudville. The new PCB fits perfectly and powers up, but apparently the specs for the exact drive in question are burned into the BIOS for that unique drive, so it looks like I would have to remove the old BIOS chip and install it on the new PCB to get the thing to work. That, or go to a professional drive recovery service.