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The Mother of All Boards. Functional Layout of PC Motherboard. XT - Also called extended technology, this is the oldest of the Intel motherboard form factors, originally designed for the 8088 CPU.AT - The AT (Advanced Technology) form factor replaced the XT, providing a software programmable configuration through BIOS () rather than hardwired jumpers.Baby-AT - The Baby AT was the first attempt to reduce the size of the motherboard while maintaining a performance capability similar to the AT. 14
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