ATX

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 expansioncard 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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(2001-07-16)