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Some of the earliest computers I used were a [[PDP-10]] running [[TOPS-10]] and a [[PDP-11/45]] running [[v6 UNIX]].  I was involved at the start of the PC/IP project to implement the Internet Protocols on a personal computer.  These days I play at building a PDP-10 replica on an FPGA and a [[QBUS]] board that will emulate some of the disk drives of old.