Mark-8 was a computer that was made a long, long time ago in the year 1974. Before computers were as small and fast as they are today, they were really big and took up a lot of space. The Mark-8 was one of these big old computers.
Think of it like a big box with lots of buttons and wires inside. When you press the buttons, it starts doing cool things like adding numbers or showing words on a screen. The wires were used to connect different parts of the computer together so they could talk to each other.
The Mark-8 was special because you could build it yourself at home! It came with a set of instructions that told you what parts to buy and how to put them together. It was like building a really big and complicated Lego set.
Even though the Mark-8 was slow compared to computers today, it was really exciting to have one at home. Imagine having a computer that you built yourself! It was like having a special toy that no one else had.
So that's what the Mark-8 was - a big old computer that you could build at home and have lots of fun with!