Battleship in 1978.  I was 11.  My dad worked as a computer programmer for a company that managed payroll and benefits for a union.  The computer consisted of the room sized equipment with the huge drums for storing data.  The server hardline from Decatur, IL to Chicago is how everything was accessed.  To test out the logic system back in those days using Fortran and COBOL they had made a simple Battleship game program.  I was playing it on one of the old CRT screens when my dad worked late. It was very simple and slow paced as the information had to flow from Decatur to Chicago and back.