Bill Gates remained in contact with Paul Allen, and he joined him at Honeywell during the summer of 1974. The MITS Altair 8800 was released the following year. The new computer was based on the Intel 8080 CPU, and Gates and Allen saw this as the opportunity to start their own computer software company. Gates dropped out of Harvard at this time. He had talked over this decision with his parents, who were supportive of him after seeing how much their son wanted to start his own company. Gates explained his decision to leave Harvard, saying "...if things [Microsoft] hadn't worked out,
Bill Gates away half of its value, as detailed in "The Power of Half". Gates and his wife invited Joan Salwen to Seattle to speak about what the family had done, and on December 9, 2010, Bill and Melinda Gates, and investor Warren Buffett signed a commitment they called the "Giving Pledge." The pledge is a commitment by all three to donate at least half of their wealth over the course of time to charity. Gates has also provided personal donations to educational institutions. In 1999, Gates donated $20 million to the Massachusetts Institute of Technology (MIT) for the construction of a