ATX
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ATX is a motherboard and power supply form factor and configuration specification developed by Intel. It aimed to improve on previous de facto standards such as the AT design. Originally released in J
An ATX motherboard
Comparison of some common motherboard form factors (pen for scale)
ATX I/O plates for motherboard rear connectors
24-pin ATX motherboard power plug; pins 11, 12, 23 and 24 form a detachable separate four-pin plug, making it backward-compatible with 20-pin ATX receptacles
AT (form factor)
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In the era of IBM compatible personal computers, the AT form factor comprises the dimensions and layout of the motherboard for the IBM AT. Baby AT motherboards are slightly smaller, measuring 8.5" by
ATX
…motherboard and power supply form factor and configuration specification developed by Intel. It aimed to improve on previous de facto standards such as the AT design. Originally released in July 1995, it was the first major change in desktop computer enclosure, motherboard and power supply design in many years…
IBM PC AT System Board. This is the original AT motherboard on which the form factor was based.
Keyed AT-style power connectors to prevent improper insertion
Baby AT motherboard
An ATX Form Card, used by later Baby-AT motherboards to allow for USB, PS/2 mouse, and IR connectivity through headers