What is the difference between AT & ATX casing?

AT IS BASICALLY BIGGER CASE ON 90S THEY HAD AT


NOW IS ATX IS LITLE MORE SMALL


BUT BETTER FEATURES THEN AT


JUST LIKE IDEAND SATA SO ATX IS NOW AND


MICRO ATX YULL SEE IN AROUND TOO MORE SMALL SIZE BUT SAME FEATURES GOOD LUCKWhat is the difference between AT %26amp; ATX casing?
The layout of the two is completely different; BTW it is ';Baby AT'; not ';AT';, ';AT'; casing refers to even older IBM 8086 casing.





ATX says itself is more efficient and flexible. CPUs in Baby AT is at lower front that effectively kills off using long cards. Screw holes between them differs greatly.What is the difference between AT %26amp; ATX casing?
AT - Advanced Technology





ATX - Advance Technology Xtreme





diference in the casing is power button and PSU.