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PC104 form factor motherboards are well established and popular because their small size makes them a good match for many field boxes and portable applications. Their best features are Small Size: At 3.5" by 3.75", the PC104 standard is one of the smallest PC motherboard form factors to enjoy wide popularity. Most PC104 CPU cards include connectors for PC peripherals like disk controllers, serial and parallel ports, and etc. The features available across PC104 motherboard manufacturers varies widely. Expansion: The PC104 expansion bus uses the same signals as the 8 and 16 bit ISA bus formerly used on desktop PCs. Many equipment manufactures have moved their ISA designs to the PC104 standard, offering all sort of add-ons such as video, ethernet, modem, audio, digital IO, and etc.