The PC-104 Standard



PC-104 Is an industry standard for I/O connectivity.

PC-104 is ISA bus on the most common 2.5mm pitch headers

PC-104+ has an additional PCI bus on 4 x30 2mm pitch headers

http://en.wikipedia.org/wiki/PC/104
http://www.pc104.org/

PC/104-PlusPC/104 Board Stack