The PDP-1 brought real-time interaction to a $120,000 minicomputerA smaller multi-user computer from the 1960s–80s — affordable to departments rather than whole corporations.: a CRTCathode-ray tube — a display technology using electron beams; the classic bulky monitor. display, light pen, and paper-tape I/O. MITMassachusetts Institute of Technology — a research university central to many computing breakthroughs. hackers built early text tools, debuggers, and time-sharingRunning multiple programs on one CPU by switching quickly between them — made interactive computing economical. experiments on it — the culture that later produced UnixAn influential multitasking OS from the 1970s — files, pipes, and C shaped Linux, macOS, and BSD., the ARPANETAdvanced Research Projects Agency Network — the U.S. research network that pioneered packet switching and became a precursor to the internet., and personal computing.

The PDP-1 was the first mass-produced interactive minicomputerA smaller multi-user computer from the 1960s–80s — affordable to departments rather than whole corporations. with a screen and keyboard.

It proved small machines could support live programming, not just batch jobs.