PDP-4
Paper tape | |
| Platform | DEC 18-bit |
|---|---|
| Mass | 1,090 pounds (490 kg) |
| Predecessor | PDP-1 |
| Successor | PDP-7 |
The PDP-4 was the successor to the Digital Equipment Corporation's PDP-1.
History
This 18-bit machine, first shipped in 1962, series.
Approximately 54 were sold.[2]
Hardware
paper tape
reader and paper tape punch.The system's memory cycle is 8 microseconds, compared to 5 microseconds for the PDP-1.[3][4]
The PDP-4 weighs about 1,090 pounds (490 kg).[5]
Mass storage
Both the
and non-removable - were an available option, but were not in the spirit of the “personal” or serially shared systems that DEC offered.It was in this setting that DEC introduced DECtape, initially called "MicroTape", for both the PDP-1 and PDP-4.
Software
DEC provided an editor, an
FORTRAN II compiler.[3]
The assembler was different from that of the PDP-1 in two ways:
- Unlike the PDP-1, macroswere not supported.
- It was a one-pass assembler; paper-tape input did not have to be read twice.
Photos
See also
References
- ISBN 0262691310.
- ^ a b DIGITAL EQUIPMENT CORPORATION - Nineteen Fifty-Seven To The Present (PDF). Digital Equipment Corporation. 1975.
- ^ ISBN 978-0262532037.
- ISBN 978-1483221106.
- ^ Weik, Martin H. (Jan 1964). "PROGRAMMED DATA PROCESSOR 4". ed-thelen.org. A Fourth Survey of Domestic Electronic Digital Computing Systems.
- ^ Bob Supnik. "Architectural Evolution in DEC's 18b Computers" (PDF).
- ^ Brochure F-71 - "Programmed Data Processor - 7" (PDF). Digital Equipment Corporation. 1964.
