A small picture is ripple control systems at right. Some of the computers offered in Ebay have had their hard drives erased.
Don’t worry if you don’t know how to use DOS. You will learn enough to get by. Of course there’s no need to get DOS if the machine already has an operating system on it that will work. Passing information around in a computer and the hardware. Boolean Logic as it relates to programming as well as the hardware. How to figure out if it’s on or off and how to turn it on and off.