PDP-1
From Computer History Wiki
The PDP-1 was the first computer built by Digital Equipment Corporation; it was an 18-bit machine, built out of DEC's System Building Blocks. Around 55 were built.
Further reading
- C. Gordon Bell, J. Craig Mudge, John. E. McNamara, "Computer Engineering: A DEC View of Hardware Systems Design" (Digital Press, Bedford, 1978) - Chapter 6 covers the PDP-1 and its background