PC/104 Bus Expander February 1, 2015 Douglas ElectronicsInc. — No Comments 3.6″ x 7.8″ board allows two PC/104 modules to be placed side-by-side with 0.25″ clearance between modules. Available with sockets only, pins only or pass-through connectors. About Douglas ElectronicsInc. Interface products for PC/104, PC/104Plus & PCI-104 to ISA, PCI, cPCI and other busses.