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PDP is PLASMA DISPLAY PANEL :)
DEC released the PDP-1 in 1960.
PDP stands for Programmed Data Processor. Therefore, it means Programmed Data Processor-8. :p
The DEC-10 is formally known as the DEC PDP-10, a mainframe family manufactured by Digital Equipment Corporation from 1966 to 1980.
Peter, David, Peter. The Directors