Industrial 4-node Pentium III systems powered by the legendary Intel 440BX chipset
My new babies for the collection. After opening them up, I discovered that each chassis contains four independent Pentium III SBC (Single Board Computer) systems. Each node has its own CPU, RAM, chipset, IDE controller and storage, while all four systems share a common power supply and connect through a passive backplane.
All tested nodes successfully POST and reach BIOS. The CMOS batteries are dead, but that's hardly surprising after all these years.
Specs observed so far:

Intel 440BX chipset Pentium III 566 MHz and 850 MHz CPUs. 64 MB RAM per node. IDE hard drives. Dedicated VGA, LAN, COM, LPT and PS/2 ports for each node.
Passive backplane architecture. The front panel is labeled "MED 1-4", which makes me wonder if these were originally used as media servers, telecom equipment or some kind of industrial control system. And how rare are these today?