The PDP-9, the 4th of the five 18-bit minicomputers produced by Digital Equipment Corporation, was introduced in 1966.:P.10 A total of 445 PDP-9 systems were produced, of which 40 were the compact, low-cost PDP-9/L units.
The PDP-9, which was "two metres wide and about 75cm deep," was approximately twice the speed of the PDP-7. It was built using discrete transistors, and had an optional integrated vector graphics terminal.
It was DEC's first microprogrammed machine.
A typical configuraton included:
Among the improvements of the PDP-9 over its PDP-7 predecessor were:
- the addition of Status flags for reader and punch errors, thus providing added flexibility and for error detection
- an entirely new design for multi-level interrupts, called the Automatic Priority Interrupt (API) option
- a more advanced form of memory management
User/university-based research projects for extending the PDP-9 included:
- to design a hardware capability for floating point arithmetic, at a time when machines in this price range used software.
- to design a PDP-9 controlled parallel computer
The PDP-7, of which 120 were sold,:p.8 was described as "highly successful.". The PDP-9 sold 445 units. Both had submodels, the PDP-7A[NB 1] and the PDP-9/L,[NB 2] neither of which accounted for a substantial percentage of sales.[NB 3]
- sometimes identified by customers and media as PDP-7/A
- yes, DEC had a "slash" for the 9/L but not for the 7A
- directly mentioned for one, calculated in the other case
- DIGITAL EQUIPMENT CORPORATION - Nineteen Fifty-Seven To The Present (PDF). Digital Equipment Corporation. 1975.
- "RI Computer Museum, DEC PDP-9, System Number 319".
- ."The Early Architectures of DEC".
- "David Millson - 50 years".
- "DEC PDP-9".
- Bob Supnik. "Architectural Evolution in DEC's 18b Computers" (PDF).
- "PDP 9 Simulator Configuration". GitHub.com.
- Ben Milton Huey (1969). "Design of a floating point processor for the PDP-9 computer". University of Arizona.
- Wokhlu, Roop Krishen (1969). "The logic design of a PDP-9 controlled parallel computer".
- Bob Supnik (19 June 2006). "Technical Notes on DECsys" (PDF).
- "User Manual - Linkage - PDP-9 Facilities" (PDF). Carnegie-Mellon University Hybrid Computation Laboratory. September 1968. Retrieved 19 September 2017.
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