That depends on what you consider the first computer:
To assemble a computer, the only tool typically required is a no 2 Phillips screwdriver. To build a computer from individual components, the number of tools required is staggering, far too many to list.
They imagined the computer before they imagined the components. The design of the components was default.
There are several components required to make a calculator. These include the lattice brevia, a box of nand gates, and a micro-controller.
Delete it components.
All computers contain the same set of components so the question can not be answered specifically for a DELL.All of the components, or substantially all of the components are required to make the machine work. That said I would think that all of the components are main components.The processor, memory; those are considered the heart of the machine.
Hardware
Computer hardware is the components that make up a computer. Computer architecture is the model used to combine the Hardware into a working unit.
Someone did make the first computer, it was Alan Turing.
Make sure you are grounded to something metal, so you don't wreck your components with static electricity.
The first programmable computer was created by Konrad Zuse and was completed in 1938. Zuse worked as a design engineer in an aircraft factory and found the numerous routine calculations required to be boring. His dream of having a machine that could perform these routine calculations, led him to create the first programmable computer.
Physical components that make up your computer are known as hardware.
A "mobo" is short for "motherboard", which it means the system board inside your computer that houses all the components to make the computer work.