The Embedded ATX [EmbATX] MotherBoard size is 9.6 inches wide by 9.6 inches deep [243.84mm x 243.84mm]. The Embedded ATX motherboard is smaller than the ATX: format which is 12" wide x 9.6" deep (305mm x 244mm). However the EmbATX has the size format as the microATX motherboard but with the additional height constraint of only 2.0 inches.
The Embedded ATX specification supports one PCI riser card using a 5 volt 32-bit PCI connector.

A PC riser slot allows for an expansion card to be attached to the motherboard, but in this case the card is mounted horizontal, flat with the motherboard [but raised up].

The EmbeddededATX standard was released by Intel in 2002, as; EmbeddedATX Motherboard Interface Specification.
Pinout tables for embATX power connectors are listed below. The Infrared Port header, USB header and Audio header are not listed
The ATX pin out is really a group of dual pin headers located on the Mother board.

Refer to ATX Main Power Connector Pinout for more information.
The 4-pin header below is optional.

There are additional headers on the EmbATX motherboard, not shown here. Refer to the ATX page for more information.
Additional headers include; 14-pin Power/LED, 14-pin Audio, 10-pin USB, and a 6-pin Infrared Port

Other pages of interest; Mother Board form factors with processor types.
The Commercial MotherBoard Manufacturers page, or Embedded Mother Board Manufacturers listing.
Also, listings for; PC Case Manufacturers, and Power Supply Manufacturers listing.

Memory Module formats and manufacturers are listed on the Memory Module Manufacturers page.

A few, but not many, computer manufacturers may use non-standard or proprietary components in their systems. The pinout for the power headers listed on this page comply with the ATX specification. However some companies may use pinouts that differ from the pinout tables above. First try to determine the pin out of the headers listed above from the manual that shipped with the computer, and use these tables only after checking the manufacturing sources of data.

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