"DPD chronology (1970–1974)". IBM. 23 January 2003. Archived from the original on October 23, 2009. DPD = Data Processing Division, which was responsible for IBM's medium and large systems.
"DPD chronology (1970–1974)". IBM. 23 January 2003. Archived from the original on October 23, 2009. DPD = Data Processing Division, which was responsible for IBM's medium and large systems.