1. What is Single Board Computer? 

Single Board Computer is a complete computer built on a single circuit board that contains a complete computer, including microprocessor, memory, Ethernet, I/O, Video and Audio output. The design is always centered around a microprocessor. The first true single-board computer was probably the MYCRO-1, built around the Intel 8080 CPU. 

Single Board Computer is of a specific form factor similar to other plug-in cards and is intended to be used in a backplane. Some architectures are dependant entirely on single-board computers, such as PICMG, ISA, PCI, Compact PCI, VME architecture, etc. In the PC world, the intelligence and interface/control circuitry is placed on a plug-in board that is then inserted into a passive (or active) backplane. The end result is similar to having a system built with a motherboard, except that the backplane determines the slot configuration. Backplanes are available with a mix of slots (ISA, PCI, PCIX, PICMG etc), usually totaling 20 or less, meaning it will fit in a 19" rackmount enclosure, or some wallmount compact chassis.

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ACROSSER Single Board Computers 
ACROSSER Industrial Chassis and Backplane