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VAX-11#VAX-11/780>VAX-11/780
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- the content below is remote from Wikipedia
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{{Short description|Family of superminicomputers by Digital}}- the content below is remote from Wikipedia
- it has been imported raw for GetWiki
missing image!
- VAX 11-780 intero.jpg -
A VAX-11/780
The VAX-11 is a discontinued family of 32-bit superminicomputers, running the Virtual Address eXtension (VAX) instruction set architecture (ISA), developed and manufactured by Digital Equipment Corporation (DEC). Development began in 1976. In addition to being powerful machines in their own right, they also offer the additional ability to run user mode PDP-11 code (thus the -11 in VAX-11), offering an upward compatible path for existing customers.The first machine in the series, the VAX-11/780, was announced in October 1977.WEB,weblink VAX-11/780 11/750, Ed Thelen, 2021-01-03, August 2005, ed-thelen.org, WEB,weblink VAX 11/780, THE FIRST VAX SYSTEM, 2021-01-03, old-computers.com, Its former competitors in the minicomputer space, like Data General and Hewlett-Packard, were unable to successfully respond to the introduction and rapid update of the VAX design. DEC followed the VAX-11/780 with the lower-cost 11/750, and the even lower cost 11/730 and 11/725 models in 1982. More powerful models, initially known as the VAX-11/790 and VAX-11/795, were instead rebranded as the VAX 8600 series.The VAX-11 line was discontinued in 1988, having been supplanted by the MicroVAX family on the low end, and the VAX 8000 family on the high end.WEB,weblink VAX-11/780 11/750, Ed Thelen, 2021-01-03, August 2005, ed-thelen.org, The VAX-11/780 is historically one of the most successful and studied computers in history.BOOK, Computer Architecture: A Quantitative Approach, John, Hennessy, David, Patterson, May 29, 2002,weblink 151, 9780080502526, - VAX 11-780 intero.jpg -
A VAX-11/780
VAX-11/780
{| class="infobox" style="font-size:88%;width:36em;"VAX-11 registers |
31 | ... | 23 | ... | 15 | ... | 07 | 06 | 05 | 04 | 03 | 02 | 01 | 00 | (bit position) |
General registers |
R0 | Register 0 |
R1 | Register 1 |
R2 | Register 2 |
R3 | Register 3 |
R4 | Register 4 |
R5 | Register 5 |
R6 | Register 6 |
R7 | Register 7 |
R8 | Register 8 |
R9 | Register 9 |
R10 | Register 10 |
R11 | Register 11 |
Index registers |
R12 / AP | Register 12 / Argument Pointer |
R13 / FP | Register 13 / Frame Pointer |
R14 / SP | Register 14 / Stack Pointer |
Program counter |
R15 / PC | Register 15 / Program Counter |
Status flags |
I | V | N | Z | C | Processor Status Word |
Floating Point Status Register |
VAX-11/782
The VAX-11/782, code-named "Atlas",WEB,weblink Hardware Documentation - Machines DEC - VAX hardware reference, The NetBSD project, 2012-08-24, is a dual-processor VAX-11/780 introduced in 1982. Both processors share the same MA780 multiport memory bus and the system operates asymmetrically, with the primary CPU performing all I/O operations and process scheduling with the second, attached processor only used for additional computationally-intensive work. For multistream computation-intensive tasks the system delivers up to 1.8 times the performance of a VAX 11/780.BOOK, VAX Product Sales Guide EG-21718-18, Digital Equipment Corporation, May 1982,weblink 2012-08-24, This model is essentially a copy of the "dual VAX-11/780" computers hand built by wire-wrapping the backplanes of two VAX-11/780 CPUs by then graduate student George H. Goble and undergraduate assistants at Purdue University as part of his work on his Master's Degree thesis on modifications of the Unix kernel for multi-cpu architecture.{{cn|date=March 2023}}VAX-11/784
The VAX-11/784, code-named "VAXimus", is a rare quad-processor variant of the VAX-11/780. Similar to the VAX-11/782, it is an asymmetric multiprocessing system, with all four KA780 processors sharing the same MA780 multiport memory bus. Its performance is rated as 3.5 VUPs. Avie Tevanian, a founder of the Mach project, has claimed in an interview that he used a VAX-11/784 to run early versions of the Mach kernel.WEB, Oral History of Avadis Tevanian,weblinkVAX-11/785
The VAX-11/785, code-named "Superstar", was introduced in April 1984.DIGITAL Computing Timeline Its KA785 CPU is essentially a faster KA780, with a CPU cycle time of 133 ns (7.52 MHz) versus the 200 ns (5 MHz) CPU cycle time of the KA780,WEB,weblink VAX-11/785 Hardware User's Guide, 1984, 2020-12-28, bitsavers.org, giving a performance of 1.5 VUPs.DIGITAL Computing Timeline The decrease in CPU cycle time is accomplished through use of Fairchild Advanced Schottky TTL (FAST) logic.VAX-11/787
The VAX-11/787 is a possible dual-processor variant of the VAX-11/785. It is unclear whether any were produced.VAX-11/750
missing image!
- VAX-11-750.jpg -
VAX-11/750
The VAX-11/750, code-named "Comet", is a more compact, lower-performance bipolar gate arrayâbased implementation of the VAX architecture introduced in October 1980.WEB,weblink VAX-11/750 Central Processor Unit Technical Description, March 1981, 2020-12-28, bitsavers.org, The use of gate arrays decreases power consumption, and increases reliability compared with the VAX-11/780.WEB,weblink Makings of a Comet: The VAX-11/750, 2014-12-08, 2020-12-28, cpushack.com, The KA750 CPU has a 320 ns cycle time (3.125 MHz), and a VUPs rating of 0.6. The system can support up to 2MB of memory with an L0011 memory controller, up to 8MB with an L0016 memory controller, or up to 14MB with an L0022 memory controller.WEB,weblink VAX-11/750, 2020-12-28, Dalby Datormuseum, While the 11/780 boots from a 8â floppy via its console processor, the VAX 11/750 is equipped with a TU58 (DECtape II) cassette drive for first level booting and diagnostics.- VAX-11-750.jpg -
VAX-11/750
VAX-11/751
(File:VAX-UniK-2.jpg|thumb|VAX-11/751)A ruggedized rack-mount VAX-11/750.WEB,weblink 2020-12-27, VMS CPU Model Summary, 1993-10-14, Paul Hardy, iankitching.me.uk,VAX-11/730
Introduced in April 1982, the VAX-11/730, code-named "Nebula", is a still-more-compact, still-lower-performance bit slice implementation of the VAX architecture using AMD Am2900 chips for the CPU. The KA730 CPU has a 270 ns cycle time (3.70 MHz), and a VUPs rating of 0.3. It supports up to 5MB of memory.WEB,weblink May 1982, 2020-12-27, bitsavers.org, VAX-11/730 CPU Technical Description,VAX-11/725
Code-named "LCN" ("Low-Cost Nebula"), it is a cost-reduced model of the VAX-11/730. It uses the same KA730 CPU as the VAX-11/730, but is housed in a more compact enclosure designed to reduce noise and heat ("55 dB" and "575 W (max.)"), making it more suitable for use in an office environment.WEB,weblink 1986, 2020-12-28, bitsavers.trailing-edge.com, DEC VAX Hardware Handbook Volume 1 - 1986, It supports up to 3MB of memory.VAX-11/790 and VAX-11/795
The VAX-11/790 and VAX-11/795 are the original names for the VAX 8600 and VAX 8650 respectively.WEB,weblink VAX 8000 Series, 2021-01-03, netbsd.org,Remaining machines
(File:VAX 11 780 CPU Backplane.jpg|thumb|A VAX-11/780 CPU backplane)- The Living Computer Museum of Seattle, Washington maintains a VAX-11/780-5 (field-upgraded VAX-11/780) running OpenVMS 7.3.
- The Computer History Museum of Mountain View, California has three VAX-11/780 systems, one VAX-11/725, one VAX-11/730, and one VAX-11/750 within its permanent collection.WEB,weblink CHM VAX-11 systems, 2015-04-24,
- The RECHENWERK Computer & Technikmuseum Halle in Halle, Germany holds a VAX-11/730 and a very rare East German clone of a VAX-11/780 named Robotron K 1840 in its permanent exhibition.
- The Verde Binario retrocomputing association has a VAX-11/780 to which they dedicated a calendar.WEB, MIAI/MUSIF 2018 calendar,weblink 2018-01-24,
- The Large Scale Systems Museum in New Kensington, PA has VAX-11/785, VAX-11/780, VAX-11/750, and VAX-11/730 systems.WEB,weblinkweblink 2022-02-26, limited, LSSM - large scale systems museum, 2021-08-04, {{cbignore}}
- The Luddy School of Informatics, Computing, and Engineering at IU Bloomington in Indiana has on display a VAX-11/780, as well as various other computers from the time.
References
{{Wikiversity|DEC VAX-11/750 (computer)}}{{Reflist}}{{DEC hardware}}{{Authority control}}- content above as imported from Wikipedia
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