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(hardware, standard)
An open PC motherboard specification by Intel.

ATX is a development of the Baby AT specification with the motherboard rotated 90 degrees in the chassis. The CPU and SIMM sockets have been relocated away from the expansion card slots meaning that all the slots support full-length cards. More I/O functions are integrated on the motherboard. As the longer edge of the board is now at the back of the chassis, there is more space for connectors; also, the I/O opening on the back panel of the chassis has been defined as double the previous height, allowing vendors to add extra on-board I/O functions over and above the standard.

Most Pentium Pro boards use this form factor.

As well as the motherboard size, layout, and placement, the ATX specification also includes requirements for power supply and fan specification and location.

The full size ATX board measures 305mm wide by 244mm deep. There is also a Mini-ATX form factor, 284mm by 208mm.
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ATX motherboard

(Advanced Technology EXtended motherboard) The PC motherboard that superseded the Baby AT design. The ATX layout rotated the CPU and memory 90 degrees, allowing full-length expansions to be plugged into all sockets. The power supply blows air over the CPU rather than pulling air through the chassis.

Introduced in 1995, the ATX was the first PC motherboard to not only include I/O support (serial, parallel, mouse, etc.), but to place all the connectors directly on the motherboard. Prior to the ATX, only the keyboard connector was attached to the motherboard.

Numerous variations of the ATX were subsequently introduced with both smaller and larger form factors, including the microATX, Mini ATX, FlexATX and Extended ATX (see PC motherboards).

The ATX Motherboard
The motherboard glues all the components of a computer system together via its various slots, connectors and ports. In this case, Socket A is for an AMD Athlon XP CPU. DDR slots hold SDRAM memory modules, and the AGP and PCI slots hold the adapter cards. The back panel ports stick through the back of the case. (Image courtesy of ASUSTeK Computer Inc.,
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References in periodicals archive ?
During the ATX, the center also makes use of the Army Aviation Combined Arms Tactical Trainer--Aviation reconfigurable simulator (AVCATT-A), a collective trainer that allows aircrews to train among themselves, and also with ground troops.
ATX compares the system to having an automotive technician sitting in the passenger seat at all times providing simple, distraction-free answers to vehicle questions.
"This is a service that vehicle owners can easily use to acquire information about today's increasingly complex vehicles when needed and without having to search for answers in a thick owner's manual," said Tom Schalk, Ph.D., vice president of voice technology, ATX. "The e-owner's manual is like having an automotive technician sitting in the passenger seat anytime you have a question about the car.
Bridgestone/Firestone said it intended to close the plant in order to help it recover from the recent tire-recall scandal involving its ATX and Wilderness ATX Firestone tires.
In August last year, Bridgestone/Firestone announced the recall of 6.5 million ATX and Wilderness ATX tires following some 50 road deaths in the U.S., allegedly caused by the treads peeling off the tires.
Ford officials say that three years ago, they began to receive anecdotal reports about "tread separation leading to accidents" in Venezuela on Explorers outfitted with Firestone ATX tires.
In August last year, Bridgestone/Firestone announced the recall of 6.5 million ATX and Wilderness ATX tires following more than 100 road deaths in the United States, allegedly caused by the tread peeling off the tires.
A spokesman for State Farm Mutual Automobile Insurance said the insurer contacted the National Highway Traffic Safety Administration two years ago about potential problems with the Firestone brand ATX tire but got no response.
At least four nationwide class actions have been filed against the company relating to the August recall of Firestone's ATX, ATX II, and Wilderness AT tires.
Firestone is recalling nearly seven million of its ATX Wilderness radials, claiming that Ford's recommended pressures were wrong.
In one of the largest auto-defect recalls in US history, Bridgestone/Firestone said the decision involves all Firestone radial ATX, radial ATXII and Wilderness AT tyres produced in North America and Mexico.