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Desktop Personal computer or Individual Computer (Pc) is the most common variety of microcomputer. It is a stand-alone machine that can be placed on the desk. Externally, it consists of 3 units—key-board, monitor, and a method unit containing the CPU, memory, hard disk drive, and so forth. It is not really costly and is suited to the requirements of a single user at home, small company units, and organizations. Apple, Microsoft, HP, Dell and Lenovo are some of the Pc producers.
Psychology: If you happen to be interested in the way people consider, you can help design technology that makes sense to humans. I learned Cobol and Fortran in high school – which shows how old I am! We hand-oded and sent in the code to be typed up and entered into mainframes. Now my ten year old programs in Scratch, makes powerpoints, edits her movies, and has her own lenses on Squidoo!
Ubuntu can run on a pc with 1GHz CPU, and 384MB of RAM, a 10 GB hard drive but if you want it to run smoothly, I suggest 1GB or much more of RAM, and a CPU more rapidly then 1 GHZ. It is ideal to use Ubuntu ten.04, ten.ten, or 11.04 since older versions of Ubuntu which are older then Ubuntu 10.04 are no longer supported by Ubuntu, so you no longer can get Updates for old versions of Ubuntu.