The mb has two primary differences. First, ATX requires a different power supply connection from the AT machines. Second, ATX has port connectors that are fixed in place and stick out the rear end of the case (rather than have plug-in connectors on the board). For the case, it, therefore, must have an ATX power supply. The power switch is also somewhat different. Second, the case must accomodate the back end of the mb. Since there are quite a few different back ends, the best thing to do is to specify what mb you are using when you buy the case. Fortunately, there seem to be two main types of mb's being used, so that many cases come with templates to accomodate these two main types. ATX motherboards are also laid out differently, but this is not a compatability issue (I don't think so, anyway). Dean Kukral [log in to unmask] -----Original Message----- From: Delano Lalla <[log in to unmask]> Date: Monday, January 18, 1999 10:46 PM Subject: [PCBUILD] AT and ATX difference? >Can someone tell me the difference between an AT motherboard and an ATX >motherboard. Same goes for cases. >Does it have anything to do with the Keyboard interface? > >Help, >Delano Lalla > PCBUILD's List Owner's: Bob Wright<[log in to unmask]> Drew Dunn<[log in to unmask]>