AT ( advanced technology )

it based on intel 80z86 processor. it based on 16 bit ISA expansion slots. early AT mother boards were bigger in size. ( 12" width and 13.8 " length ) but letter AT's come 1/4 size of its 8086 board M.B. for each peripheral it also uses uses card as in XT M.B. used 12 pin power supply which is 2 plugs of 6 pin each.  

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