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The PDP-1 and PDP-8 were both Digital Equipment Corporation (DEC) computers, but they addressed different priorities. The PDP-1 was an 18-bit interactive research computer built around experimentation, graphics, and hands-on use. The 12-bit PDP-8 was designed as a smaller, less expensive computer that could serve laboratories, industrial control, and business applications. The PDP-8 was not simply a technical successor to the PDP-1: it made computing accessible to a much broader range of users.
How the PDP-1 and PDP-8 compare
| Feature | PDP-1 | Original PDP-8 |
|---|---|---|
| Word size | 18 bits, according to the Computer History Museum’s PDP-1 overview. | 12 bits, according to DEC’s 1965 brochure and the Digital Computer Museum catalog. |
| Memory | DEC’s 1961 brochure describes 4,096-word memory modules and expansion options; configurations varied. | 4,096 words in the original configuration, expandable to 32,768, according to the Digital Computer Museum catalog and DEC’s 1965 brochure. |
| Performance figures | DEC’s 1961 brochure claims 100,000 additions per second, including two memory calls, and specifies a five-microsecond core-memory cycle. | The Digital Computer Museum catalog lists a 1.5-microsecond memory cycle and 333,333 single-address instructions per second. DEC’s 1965 brochure gives a 1.6-microsecond cycle time. |
| Catalog price and configuration | The Digital Computer Museum’s 1981 catalog lists $120,000. DEC’s brochure describes a multi-frame system with typewriter and tape equipment; the catalog price may not represent an identical bundle. | The Digital Computer Museum’s 1981 catalog lists $18,000 with 4,096 words of memory and a Teletype type 33ASR. |
| Typical emphasis | Interactive programming, graphics, scientific research, process control, and early timesharing. | Real-time control, data collection, scientific and engineering work, communications, small-business processing, and timesharing. |
These are historical source figures, not modern equivalents. The performance numbers use different measures—additions per second versus single-address instructions per second—and cannot be compared as if they were the same benchmark. Prices also refer to different cataloged configurations.
Why the machines were different
PDP-1: an interactive machine for experimentation
The PDP-1 grew out of work associated with MIT Lincoln Laboratory and the TX-0. DEC’s design drew on circuit modules developed for laboratory computing; in a Computer History Museum account of a question Ed Fredkin put to designer Ben Gurley, Gurley jokingly said his design parameter was “To make it from inventory.” That anecdote captures the practical roots of the machine, but the result became an important platform for interactive computing.
DEC’s 1961 brochure presents the PDP-1 as a compact, solid-state, general-purpose computer. It specifies 18-bit parallel processing, five-megacycle logic, a five-microsecond core-memory cycle, and 100,000 additions per second under the brochure’s stated condition of two memory calls. Standard equipment included an alphanumeric typewriter, punched-tape reader and punch, and a single-channel automatic interrupt. Optional equipment included a CRT display and light pen, along with card controls, tape systems, and other input/output options. Actual installations could differ from the brochure configuration.
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The combination of interactive access and optional display equipment supported programming, graphics, scientific work, process control, and early timesharing. The PDP-1 also helped cultivate an early programming culture around MIT and its collaborators; the Computer History Museum connects that history with the creation of Spacewar!. Its exhibit estimates that about 50 PDP-1 machines were built.
PDP-8: compact computing at a lower catalog price
The PDP-8 traded the PDP-1’s 18-bit design for 12-bit words and a compact system intended to reach more organizations. DEC’s 1965 brochure specifies 4,096 words of core memory, expandable to 32,768. The Digital Computer Museum catalog lists the original model’s memory cycle as 1.5 microseconds, while DEC’s brochure gives 1.6 microseconds. Those source-specific figures may reflect configuration or rounding; they should not be collapsed into a false exact value.
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The PDP-8’s lower catalog price and provision for accessible input/output helped make it practical beyond a small set of research institutions. Its documented uses included real-time control and data collection as well as scientific and engineering computing, data communications, small-business processing, and timesharing. The catalog’s $18,000 figure describes an original system with 4,096 words and a Teletype type 33ASR, rather than every model or bundle.
Dates depend on which milestone is meant
Historical sources use different dates because they refer to different events or summarize the timeline differently. For the PDP-1, the Computer History Museum’s restoration overview dates its launch to 1959; the Digital Computer Museum catalog records its first shipment to Bolt, Beranek and Newman in November 1960; and a Computer History Museum corporate-history description says DEC released its first computer in 1961.
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The PDP-8 timeline also spans more than one milestone. The Digital Computer Museum catalog records project start in 1964 and first delivery in April 1965. The Computer History Museum collection describes its introduction in 1965, while accounts of its introduction or announcement may use 1964 or 1965. It is more accurate to name the source and event than to treat one date as the only possible answer.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why the PDP-8 became a landmark
The PDP-1’s significance lies in its role as an early commercial interactive computer and in the programming and graphics culture that grew around it. Its influence was substantial, even though the museum estimates only about 50 were made.
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The PDP-8 became a landmark through broader reach. The Digital Computer Museum catalog estimates approximately 5,000 original PDP-8s; the Computer History Museum describes more than 10,000 machines across a dozen-plus variations over 25 years. Those figures cover different scopes: the former is for the original model, while the latter counts the wider family. The museum calls the PDP-8 the first commercially successful minicomputer. Other histories call it the first true minicomputer, so that priority claim is best understood as a qualified description of its place in the emerging category, not an uncontested label.
Together, the computers show two routes by which DEC helped establish the minicomputer era: the PDP-1 made interactive computing tangible for researchers and programmers, while the PDP-8 made useful computing available to a wider range of laboratories and organizations.
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