This is a system board from a DEC Personal Workstation 433a with a 433-MHz Alpha AXP CPU (top-left corner). This is a system from the 1996 and was quite expensive. Next to the CPU, you can see the cache module and 8 RAM slots. The custom chipset provides memory (128bit)/PCI-X (64bit) controllers. The Intel PCIset chip is just a PCI-to-ISA bridge and the SuperI/O chip provides keyboard controller, RTC and serial/parallel port support. This is not the whole logic board.
The remaining part contains PCI/ISA slots IDE/floppy ports, 10Mb/s Ethernet controller, PCI-to-PCI bridge, ISA ESS AudioDrive chip etc. Two-board design reason? Personal Workstation existed also in a dual Pentium Pro version. Only the board with CPU/RAM was different.
We fixed this machine and completely cleaned all parts. The case design is surprisingly complicated and it took ages to disassemple/assemble the whole thing. This was one of the dirtier machines we rescued – we were quite radical there.
Here you can see the complete machine. With SCSI controllers installer, all riser boards (ethernet, audio), PSUs and storage devices. The long PCI card is a high-end Evans & Sutherland 3D accelerator from @morciatka that makes an ultimate hi-end workstation.
