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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.
References in periodicals archive ?
86GHz fan less embedded system with 5-wire resistive type touch screen, rich I/O ports, 130W ATX power supply, and is all protected with IP65 rated stainless steel front bezel.
8 laptop battery, laptop bag, portable hard drive, external hard disk drive to the video recorder, HDMI cable, keyboard, laser mouse, wireless set - mouse and keyboard, memory Portable 16 GB, 64 GB memory stick, speakers, BDs, DVDs, CDs, server rack 19 42U, shredder, projector, the ATX power supply, surge protector, uninterruptible power supply.
Corsair has introduced the AX1500i Digital ATX power supply.
This 280mm x 200mm x 115mm chassis features a 150w ATX power supply and space to incorporate one or two PC/ 104, PC/104-Plus or PCI-104 expansion modules.
Power is provided by an embedded 150 W ATX power supply.
Four shock-isolated drive bays accept any combination of hard drives, removable media, DVD, CD-ROM, CDRW or other storage devices, and the FieldGo R9 accepts up to 2GB memory, has one parallel, two serial and two USB ports, a 300W 440Hz 110/220 VAC ATX power supply and is available with an optional UPS PCI card.
The ZT Systems R1801e uses an industry standard 1U chassis, ATX power supply and SATA drive bank, so it fits easily into existing development lab and datacenter environments.
Contract are awarded for Atx Power Supply of 600 Watts or Better As Sata Connector Repair Parts for Desktop Computer Tower Type.
Flexible ordering options include internal ATX power supply or external +12VDC or +24VDC input, choice of 280mm x 200mm or 180mm x 152mm enclosure footprint, choice of RAM size up to 1GB DDR 333, and hard drives up to 100 GB capacity.
Power can be provided to the A-Brain through a small locking 12-pin power connector with a cable adapter available, able to be connected to any ATX power supply.
The ReadySystem ATX computer offers customizable I/O expansion, up to two PC/104 modules, and includes an integrated ATX power supply.
The reference design addresses all functional blocks of the ATX power supply, including power factor correction, switch-mode power supply control and regulation, post regulation and standby power.