PDP-9
The PDP-9, the 4th of the five 18-bit minicomputers produced by Digital Equipment Corporation, was introduced in 1966.[1]:P.10 A total of 445 PDP-9 systems were produced,[2] of which 40 were the compact, low-cost PDP-9/L units.[3]
History
The 18-bit PDP systems preceding the PDP-9 were named PDP-1, PDP-4 and PDP-7.
Hardware
The PDP-9, which was "two metres wide and about 75cm deep,"[4] 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.[5]
A typical configuraton included:[2]
- 300 cps Paper Tape Reader
- 50 cps Paper Tape Punch
- 10 cps Console Teleprinter, Model KSR-33
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[6]
- an entirely new design for multi-level interrupts, called the Automatic Priority Interrupt (API) option
- a more advanced form of memory management[7]
User/university-based research projects for extending the PDP-9 included:
Software
The system came with a single-user Keyboard monitor. DECsys, provided an interactive, single user, program development environment for Fortran and assembly language programs.[10]
Both FORTRAN II[2] and FORTRAN IV[11] were implemented for the PDP-9.
Sales
The PDP-7, of which 120 were sold,[1]:p.8 was described as "highly successful.".[2] 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.[1][NB 3]
Photos
See also
- Programmed Data Processor
- PDP-15 - successor to the PDP-9
Notes
References
- 1 2 3 DIGITAL EQUIPMENT CORPORATION - Nineteen Fifty-Seven To The Present (PDF). Digital Equipment Corporation. 1975.
- 1 2 3 4 "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.