Inside the PDP-8: How a 12-Bit Minicomputer Taught Us to Think
From Front Panel to Program: Thinking Like a PDP-8
The PDP-8, introduced in 1965, was a landmark minicomputer that made computing accessible to labs and factories. Its 12-bit architecture, accumulator-based design, and quirky features like the LINK bit and memory-mapped I/O were pragmatic solutions to hardware constraints. This article explores the PDP-8's family of models, from the original to the 8/A, and explains how its simplicity makes it an ideal tool for learning computer architecture. It also includes a field guide to a fully-configured PDP-8/E, detailing its front panel, paper-tape reader, DECtape drives, and disk storage.
The different models are almost like experiments in implementation: "How cheaply, quickly, or compactly can we build essentially the same computer?"