Paul Allen flies from Harvard to Albuquerque, New Mexico, to meet with Ed Roberts at MITS, to demonstrate the newly written BASIC interpreter for the Altair. Paul writes a paper tape reader on the plane trip, for the Altair to load the BASIC software. At MITS, Paul enters the loader, the Altair reads the paper tape, and is ready to execute BASIC instructions. Despite never having touched an Altair before, the BASIC works flawlessly. Paul types "PRINT 2 + 2", and the Altair responds "4". Paul then types in the BASIC source code for a Lunar Lander game from a book. This becomes the first sofware program ever run on what would later become MS BASIC.