There are many motherboard sizes, and ATX is simply one of them.
Others inlude Mini-ITX, MicroATX, etc.
According to my A+ book a CPU in a AT mobo will sit towards the front of the board and in front of the ISA slots. On an ATX mobo it will sit towards the back near the fan and to the side of the ISA slots.
With the exception of some various expensive industrial motherboards, you will not find any ISA slots on a motherboard. In order to be certified for Windows 2000 and later, Microsoft required that manufacturers remove ISA slots from their boards.
Imma-Isa-Isa
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Intrinsic Factor. This, also known as gastric intrinsic factor (GIF),isa glycoprotein produced by thestomach necessary for the absorption ofB12 there and in the small intestine.
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Isa Dick Hackett goes by Isa.
Isa Hoes's birth name is Isa Hoes.
Isa means one.
Isa Vermehren's birth name is Vermehren, Isa Beate..
Isa Guseinov's birth name is Guseinov, Isa Mustafa.
Isa Holm's birth name is Isa Mller Srensen.