In the era of IBM compatible personal computers, the AT form factor comprises the dimensions and layout (form factor) of the motherboard for the IBM AT. Baby AT motherboards are slightly smaller, measuring 8.5" by 13". 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.
In the era of IBM compatible personal computers, the AT form factor comprises the dimensions and layout (form factor) of the motherboard for the IBM AT. Baby AT motherboards are slightly smaller, measuring 8.5" by 13". 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.
Source: Wikipedia "AT (form factor)" · CC BY-SA 4.0
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