PC/104 modules are tied to the ISA-Bus standard that is mainly used in embedded systems. The modules are 3.6" x 3.8" and can be self-stacked to save space.  The PC/104 standard offers full architecture, hardware, and software compatibility with the PC bus.  PC/104 is ideally suited to the unique requirements of embedded control applications   PC/104-Plus establishes a standard for the use of the fast PCI bus in PC/104 form factor embedded applications.   Dedicated and embedded applications for PC/104 modules are used as controllers within laboratory instruments, communications devices, and medical equipment, to name just a few examples.