page_title: AT (form factor)
hierarchical_section_title: AT (form factor)
caption_attribution_description: English: Photo of original (1984) IBM PC AT (5170) System Board [1]
context_page_description: In the era of IBM compatible personal computers, the AT form factor referred to the dimensions and layout (form factor) of the motherboard for the IBM AT. Like the IBM PC and IBM XT models before it, many third-party manufacturers produced motherboards compatible with the IBM AT form factor, allowing end users to upgrade their computers for faster processors. The IBM AT became a widely copied design in the booming home computer market of the 1980s. IBM clones made at the time began using AT compatible designs, contributing to its popularity. In the 1990s many computers still used AT and its variants. Since 1997, the AT form factor has been largely supplanted by ATX.
context_section_description: In the era of IBM compatible personal computers, the AT form factor referred to the dimensions and layout (form factor) of the motherboard for the IBM AT. Like the IBM PC and IBM XT models before it, many third-party manufacturers produced motherboards compatible with the IBM AT form factor, allowing end users to upgrade their computers for faster processors. The IBM AT became a widely copied design in the booming home computer market of the 1980s. IBM clones made at the time began using AT compatible designs, contributing to its popularity. In the 1990s many computers still used AT and its variants. Since 1997, the AT form factor has been largely supplanted by ATX.
caption: IBM PC AT System Board. This is the original AT motherboard on which the form factor was based
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