Difference between revisions of "PDP-11"

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[[Image:KA11FrontPanel.jpg|right|thumb|300px|[[Front panel]] of the [[KA11 CPU|KA11]], the first PDP-11 model]]
 
[[Image:KA11FrontPanel.jpg|right|thumb|300px|[[Front panel]] of the [[KA11 CPU|KA11]], the first PDP-11 model]]
 +
 +
It was the machine which made [[UNIX]], which now seems to have taken over the world (in the form of [[Linux]]) widely known and popular.
  
 
The machine [[word]] size was 16 bits, and it was a [[general register]] [[architecture]]. Although it was not the first to feature the latter, its wide distribution (in 1980, it was the world's best-selling computer) and its novel addressing modes (below) have helped influence almost all later machines to follow that path.
 
The machine [[word]] size was 16 bits, and it was a [[general register]] [[architecture]]. Although it was not the first to feature the latter, its wide distribution (in 1980, it was the world's best-selling computer) and its novel addressing modes (below) have helped influence almost all later machines to follow that path.
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PDP-11's came in two groups: those which used the [[UNIBUS]] for a bus, and the later ones which used the [[QBUS]]. Eventually DEC stopped producing [[UNIBUS]] PDP-11's (the last were the [[PDP-11/44]] and [[PDP-11/24]]); later 'UNIBUS' machines (the [[PDP-11/84]] and [[PDP-11/94]]) actually contained QBUS processors with a QBUS<->UNIBUS adapter board.
 
PDP-11's came in two groups: those which used the [[UNIBUS]] for a bus, and the later ones which used the [[QBUS]]. Eventually DEC stopped producing [[UNIBUS]] PDP-11's (the last were the [[PDP-11/44]] and [[PDP-11/24]]); later 'UNIBUS' machines (the [[PDP-11/84]] and [[PDP-11/94]]) actually contained QBUS processors with a QBUS<->UNIBUS adapter board.
  
−
Towards the end of its life, there were several microcomputer implementations of the PDP-11, as [[integrated circuit|chips]].
+
Towards the end of its life, there were several microprocessor implementations of the PDP-11, as [[integrated circuit|chips]]. After DEC discontinued production of PDP-11's, the line was sold to [[Mentec]], who produced a few newer models.
 +
 
 +
== PDP-11 Models and notes ==
 +
 
 +
{| class="wikitable"
 +
! Model !! Introduced !! Bus Type !! Addressing !! [[PDP-11 Memory Management|Split I & D]] !! Notes !! Speed (VUPS)
 +
|-
 +
| [[PDP-11/20|11/20]] || 1969[1] ||[[UNIBUS]] || 16-bit || no || ||
 +
|-
 +
| [[PDP-11/05|11/05]] || 1972 || UNIBUS || 16-bit || no || OEM model ||
 +
|-
 +
| [[PDP-11/10|11/10]][*] || 1972 || UNIBUS || 16-bit || no || ||
 +
|-
 +
| [[PDP-11/15|11/15]] || 1972 || UNIBUS || 16-bit || no || OEM model ||
 +
|-
 +
| [[PDP-11/35|11/35]] || 1973 || UNIBUS || 18-bit || no || OEM model ||
 +
|-
 +
| [[PDP-11/40|11/40]] || 1973 || UNIBUS || 18-bit || no || ||
 +
|-
 +
| [[PDP-11/45|11/45]] || 1973 || UNIBUS || 18-bit || yes || core memory ||
 +
|-
 +
| [[PDP-11/50|11/50]] || 1975 || UNIBUS || 18-bit || yes || [[Metal Oxide Semiconductor|MOS]] memory ||
 +
|-
 +
| [[PDP-11/55|11/55]] || 1976 || UNIBUS || 18-bit || yes || fast bipolar memory ||
 +
|-
 +
| [[PDP-11/70|11/70]] || 1975 || UNIBUS || 22-bit || yes || || 0.6
 +
|-
 +
| [[PDP-11/03|11/03]] || 1975 || [[QBUS]] || 16-bit || no || first QBUS model || 0.05
 +
|-
 +
| [[PDP-11/04|11/04]] || 1976 || UNIBUS || 16-bit || no || || 0.11
 +
|-
 +
| [[PDP-11/34|11/34]] || 1976 || UNIBUS || 18-bit || no || || 0.21
 +
|-
 +
| [[PDP-11/60|11/60]] || 1977 || UNIBUS || 18-bit || no || writable control store ||
 +
|-
 +
| [[PDP-11/23|11/23]] || 1979 || QBUS || 18-bit ''or'' 22-bit || no || first [[F-11]] || 0.12
 +
|-
 +
| [[PDP-11/24|11/24]] || 1979 || UNIBUS || 22-bit || no || only UNIBUS model to use F-11 chip || 0.18
 +
|-
 +
| [[PDP-11/44|11/44]] || 1979 || UNIBUS || 22-bit || yes || last non-LSI PDP-11 || 0.42
 +
|-
 +
|[[PDP-11/23-PLUS|11/23+]] || 1981 Nov || QBUS || 22-bit || no || || 0.18
 +
|-
 +
| [[PDP-11/73|11/73]] || 1983 || QBUS || 22-bit || yes || first [[J-11]] machine, 15MHz, integrated [[FPU]], also first [[PMI]] PDP-11 || 0.45
 +
|-
 +
| [[PDP-11/53|11/53]] || 1984 || QBUS || 22-bit || yes || S-box or standard QBUS, integrated FPU, 768KiW memory || 0.29
 +
|-
 +
| [[PDP-11/83|11/83]] || 1988 || QBUS || 22-bit || yes || J-11 at 18MHz, integrated FPU || 0.72
 +
|-
 +
| [[PDP-11/84|11/84]] || 1988 || UNIBUS || 22-bit || yes || J-11 at 18MHz, integrated FPU || 0.72
 +
|-
 +
| [[PDP-11/93|11/93]] || 1990 || QBUS || 22-bit || yes || J-11 at 18MHz, integrated FPU, 2MiW onboard memory || 1.0
 +
|-
 +
| [[PDP-11/94|11/94]] || 1990 || UNIBUS || 22-bit || yes || J-11 at 18MHz, integrated FPU, 2MiW onboard memory || 1.0
 +
|}
 +
 
 +
''<span style="font-size:70%">[*]The name PDP-11/10 was recycled by DEC from an earlier [[KA11 CPU]]-based 11/10 from 1969, or at least it existed in advertisements[1]</span>''
  
−
It could run a variety of [[operating system]]s. Many were produced by [[DEC]] themselves, but several were produced by third-parties. It was the machine which made [[UNIX]], which now seems to have taken over the world (in the form of [[Linux]]) widely known and popular, with [[UNIX Sixth Edition]]. Often DEC would purchase or re-brand such an OS and re-sell it as their own product; for example, UNIX sold as [[Ultrix]] by DEC.
+
==Operating Systems==
  
−
After DEC discontinued production of PDP-11's, the line was sold to [[Mentec]], who produced a few newer models.
+
There were a number of well-known [[operating system]]s for the PDP-11. Many were produced by [[DEC]] themselves, but several were produced by third-parties. Often DEC would purchase or re-brand such an OS and re-sell it as their own product; for example, UNIX sold as [[Ultrix]] by DEC.
  
−
== Operating Systems ==
+
UNIX was not originally a PDP-11 system (it was born on the [[PDP-7]]), but it moved to the PDP-11 shortly after it was first created, and spread widely there (since PDP-11's were common machines, due to their relatively low cost and good engineering), with the real explosion of use starting with [[UNIX Sixth Edition]].
  
−
=== Unix based Operating Systems ===
+
===UNIX===
  
 
* [[UNIX First Edition]]
 
* [[UNIX First Edition]]
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These are the original Bell Laboratories releases of Unix; the first 4 were only internal to Bell, the Fifth saw limited distribution outside it, and the Sixth took over the world.
 
These are the original Bell Laboratories releases of Unix; the first 4 were only internal to Bell, the Fifth saw limited distribution outside it, and the Sixth took over the world.
 +
 +
* [[LSX]]
 +
* [[MINI-UNIX]]
 +
 +
For PDP-11's without [[memory management]].
  
 
* [[System III]]
 
* [[System III]]
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* [[2.9 BSD]]
 
* [[2.9 BSD]]
  
−
This version was a port of the [[4.3 BSD]] feature set to the PDP-11.  Although considered impossible by many, it accomplished this by using [[overlay]]s for portions of the [[kernel]], and to allow for user programs larger then 64KB.
+
This version was a port of the [[4.3 BSD]] feature set to the PDP-11.  Although considered an impossible goal by many, it accomplished this by using [[overlay]]s for portions of the [[kernel]], and to allow for user programs larger than 64KB.
  
 
* [[2.10 BSD]]
 
* [[2.10 BSD]]
 
* [[2.11 BSD]]
 
* [[2.11 BSD]]
  
−
This version is still supported, and if one really felt the need to load a Unix for use on a PDP-11 this would be the best fit. It has support for [[TCP/IP]], large memory space and is the best UNIX experience one can get going to get on a 16-bit mini.
+
This last version is still supported, and if one really felt the need to load a Unix for use on a PDP-11 this would be the best fit. It has support for [[TCP/IP]], large memory space and is the best UNIX experience one can get going to get on a 16-bit mini.
  
−
=== Other OS's ===
+
===DEC OS's===
  
 +
* [[DOS-11]]
 
* [[RSX-11]]
 
* [[RSX-11]]
−
* [[RSTS/E]]
+
* [[RSTS/E]] - a descendant of [[RSTS-11]]
 
* [[RT-11]]
 
* [[RT-11]]
 +
* [[Interactive Application System|IAS]]
  
 
Technically also an OS is [[XXDP diagnostic package|XXDP]], which is an 'overseer' for running the PDP-11 [[diagnostic]]s produced/provided by DEC.
 
Technically also an OS is [[XXDP diagnostic package|XXDP]], which is an 'overseer' for running the PDP-11 [[diagnostic]]s produced/provided by DEC.
  
−
== PDP-11 Models and notes ==
+
===Real-time OS's===
 +
 
 +
PDP-11's were very popular in [[real-time]] and [[data network]]ing uses; a number of OS's were developed for such environments:
 +
 
 +
* [[ANTS terminal system|ANTS]]
 +
* [[ELF operating system|ELF]]
 +
* [[MOS operating system|MOS]] - an ELF descendant
 +
* [[MERT operating system|MERT]] - another Bell system
 +
* [[MINITS]] - network appliance framework
 +
 
 +
===Miscellaneous===
 +
 
 +
* [[SITS]] - "Small [[Incompatible Timesharing System|ITS]]" for running Logo
 +
* [[Camexec]] - hosted the Camex typesetting system
 +
* Trantor - written for the MIT Applied Mathematics Department
 +
 
 +
==Simulators==
 +
 
 +
There a number of good [[simulator]]s for the PDP-11:
 +
 
 +
* [[SIMH]]
 +
* [[Ersatz-11]]
 +
 
 +
The latter is less well known than the ubiquitous SIMH, but is very fast; simulated systems running on Ersatz-11 are usually faster than real PDP-11's.
  
−
{| class="wikitable"
+
==New Emulator Hardware==
−
! Model !! Introduced !! Bus Type !! Addressing !! Notes !! Speed (VUPS)
 
−
|-
 
−
| [[PDP-11/20|11/20]] || 1969[1] ||[[UNIBUS]] || 16-bit || ||
 
−
|-
 
−
| [[PDP-11/05|11/05]] || 1972 || UNIBUS || 16-bit || OEM model ||
 
−
|-
 
−
| [[PDP-11/10|11/10]][*] || 1972 || UNIBUS || 16-bit || ||
 
−
|-
 
−
| [[PDP-11/15|11/15]] || 1972 || UNIBUS || 16-bit || OEM model ||
 
−
|-
 
−
| [[PDP-11/35|11/35]] || 1973 || UNIBUS || 18-bit || OEM model ||
 
−
|-
 
−
| [[PDP-11/40|11/40]] || 1973 || UNIBUS || 18-bit || ||
 
−
|-
 
−
| [[PDP-11/45|11/45]] || 1973 || UNIBUS || 18-bit || core memory ||
 
−
|-
 
−
| [[PDP-11/50|11/50]] || 1975 || UNIBUS || 18-bit || [[MOS]] memory ||
 
−
|-
 
−
| [[PDP-11/55|11/55]] || 1976 || UNIBUS || 18-bit || fast bipolar memory ||
 
−
|-
 
−
| [[PDP-11/70|11/70]] || 1975 || UNIBUS || 22-bit || || 0.6
 
−
|-
 
−
| [[PDP-11/03|11/03]] || 1975 || [[QBUS]] || 16-bit || first QBUS model || 0.5
 
−
|-
 
−
| [[PDP-11/04|11/04]] || 1976 || UNIBUS || 16-bit || || 0.11
 
−
|-
 
−
| [[PDP-11/34|11/34]] || 1976 || UNIBUS || 18-bit || || 0.21
 
−
|-
 
−
| [[PDP-11/60|11/60]] || 1977 || UNIBUS || 18-bit || writable control store ||
 
−
|-
 
−
| [[PDP-11/23|11/23]] || 1979 || QBUS || 18-bit ''or'' 22-bit || first [[F-11]] || 0.12
 
−
|-
 
−
| [[PDP-11/24|11/24]] || 1979 || UNIBUS || 22-bit || only UNIBUS model to use F-11 chip || 0.18
 
−
|-
 
−
| [[PDP-11/44|11/44]] || 1979 || UNIBUS || 22-bit || last non-LSI PDP-11 || 0.42
 
−
|-
 
−
|[[PDP-11/23-PLUS|11/23+]] || 1981 Nov || QBUS || 22-bit || || 0.18
 
−
|-
 
−
| [[PDP-11/73|11/73]] || 1983 || QBUS || 22-bit || first [[J-11]] machine, 15MHz, integrated [[FPU]], also first [[PMI]] PDP-11 || 0.45
 
−
|-
 
−
| [[PDP-11/53|11/53]] || 1984 || QBUS || 22-bit || S-box or standard QBUS, integrated FPU, 768KiW memory || 0.29
 
−
|-
 
−
| [[PDP-11/83|11/83]] || 1988 || QBUS || 22-bit || J-11 at 18MHz, integrated FPU || 0.72
 
−
|-
 
−
| [[PDP-11/84|11/84]] || 1988 || UNIBUS || 22-bit || J-11 at 18MHz, integrated FPU || 0.72
 
−
|-
 
−
| [[PDP-11/93|11/93]] || 1990 || QBUS || 22-bit || J-11 at 18MHz, integrated FPU, 2MiW onboard memory || 1.0
 
−
|-
 
−
| [[PDP-11/94|11/94]] || 1990 || UNIBUS || 22-bit || J-11 at 18MHz, integrated FPU, 2MiW onboard memory || 1.0
 
−
|}
 
  
−
''<span style="font-size:70%">[*]The name PDP-11/10 was recycled by DEC from an earlier [[KA11 CPU]]-based 11/10 from 1969, or at least it existed in advertisements[1]</span>''
+
* [[UniBone/QBone]]
  
 
==See also==
 
==See also==
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* [[PDP-11 architecture]]
 
* [[PDP-11 architecture]]
 
* [[PDP-11 Memory Management]]
 
* [[PDP-11 Memory Management]]
 +
* [[MicroNote]]s
 
* [[UNIBUS memories]]
 
* [[UNIBUS memories]]
 
* [[QBUS memories]]
 
* [[QBUS memories]]
 +
* [[UNIBUS peripherals]]
 +
* [[QBUS peripherals]]
 
* [[UNIBUS boot ROMs]]
 
* [[UNIBUS boot ROMs]]
 
* [[QBUS boot ROMs]]
 
* [[QBUS boot ROMs]]
 +
* [[H95xx-H96xx Series of DEC Cabinets and Accessories]]
 +
* [[List of VAX models with PDP-11 compatibility mode]]
 
* [[PDP11GUI]]
 
* [[PDP11GUI]]
 +
 +
==Further reading==
 +
 +
* ''PDP-11 Family Differences'', [[MicroNote]] #053
  
 
==External links==
 
==External links==
  
 
* [http://www.bitsavers.org/pdf/dec/pdp11/ PDP11] - Documentation at [[Bitsavers]]
 
* [http://www.bitsavers.org/pdf/dec/pdp11/ PDP11] - Documentation at [[Bitsavers]]
 +
** [http://www.bitsavers.org/pdf/dec/pdp11/catalogs/ED-25116-18_PDP-11_Systems_and_Options_Catalog_Jul83.pdf PDP-11 Systems & Options Catalog] (July-September 1983) - late in the run, but a voluminous look at what was available at that time
 
** [http://www.bitsavers.org/pdf/dec/pdp11/memos/ memos] - Interesting internal DEC memos about the PDP-11
 
** [http://www.bitsavers.org/pdf/dec/pdp11/memos/ memos] - Interesting internal DEC memos about the PDP-11
 +
*** [http://www.bitsavers.org/pdf/dec/pdp11/memos/690111_How_Good_Is_The_PDP-11.pdf How Good is the PDP-11?] - interesting early comparison with competitors
 
* [https://gordonbell.azurewebsites.net/Digital/PDP%2011%20Handbook%201969.pdf PDP-11 Handbook (1969)]
 
* [https://gordonbell.azurewebsites.net/Digital/PDP%2011%20Handbook%201969.pdf PDP-11 Handbook (1969)]
 +
* [http://s3data.computerhistory.org/brochures/dec.pdp-11.1977.102646131.pdf PDP-11 Variations on a Theme] - marketing brochure from DEC
 
* [https://gordonbell.azurewebsites.net/CGB%20Files/New%20Architecture%20PDP11%20SJCC%201970%20c.pdf A new architecture for mini-computers - The DEC PDP-11] - the [[AFIPS]] paper which introduced the PDP-11
 
* [https://gordonbell.azurewebsites.net/CGB%20Files/New%20Architecture%20PDP11%20SJCC%201970%20c.pdf A new architecture for mini-computers - The DEC PDP-11] - the [[AFIPS]] paper which introduced the PDP-11
 
* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/PDP-11_Models.html PDP-11 Recognition] - Illustrated guide to identifying PDP-11 models
 
* [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/PDP-11_Models.html PDP-11 Recognition] - Illustrated guide to identifying PDP-11 models
 +
* [http://pdp-11.trailing-edge.com/ The PDP-11 archives] - miscellaneous software, links <!-- http://www.bitsavers.org/pdp-11.trailing-edge.com/ -->
 +
* [https://www.ibiblio.org/pub/academic/computer-science/history/pdp-11/ The PDP-11 archives at metalab.unc.edu]
 +
** [https://www.ibiblio.org/pub/academic/computer-science/history/pdp-11/hardware/ PDP-11 hardware] - large collection of odds and ends
 +
* [https://hampage.hu/pdp-11/ PDP-11]
 +
** [https://hampage.hu/pdp-11/main.html The Pre-Life of a Legend is another Legend]
 +
** [http://hampage.hu/pdp-11/birth.html How the PDP-11 Was Born (according to Larry McGowan)]
 +
* [https://pdp-11.org/ PDP-11 history and links to materials]
 +
* [https://www.pdp-11.nl/ Henk's DIGITAL computer room] - an amazing collection of PDP-11's
 +
* [https://www.computercollection.net/pdp11/index.htm The PDP-11 Family] - another significant collection
 
* [https://arstechnica.com/gadgets/2022/03/a-brief-tour-of-the-pdp-11-the-most-influential-minicomputer-of-all-time/ A brief tour of the PDP-11, the most influential minicomputer of all time] - has some minor errors, but generally good
 
* [https://arstechnica.com/gadgets/2022/03/a-brief-tour-of-the-pdp-11-the-most-influential-minicomputer-of-all-time/ A brief tour of the PDP-11, the most influential minicomputer of all time] - has some minor errors, but generally good
 
* [https://gordonbell.azurewebsites.net/Digital/PDP11_Arch_Enhance_Strategy_75.pdf Proposal for PDP-11 I/O Architecture]
 
* [https://gordonbell.azurewebsites.net/Digital/PDP11_Arch_Enhance_Strategy_75.pdf Proposal for PDP-11 I/O Architecture]
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==References==
 
==References==
  
−
* [http://vintagecomputer.net/digital/PDP11-20/PDP11_Price-List_19691215.pdf PDP-11/20 Price List]
+
# [http://vintagecomputer.net/digital/PDP11-20/PDP11_Price-List_19691215.pdf PDP-11/20 Price List]
  
 
{{PDP-11}}
 
{{PDP-11}}
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[[Category: PDP-11s]]
 
[[Category: PDP-11s]]
 
[[Category: DEC Architectures]]
 
[[Category: DEC Architectures]]
 +
[[Category: 16-bit Computers‎]]

Latest revision as of 10:45, 12 October 2024

The PDP-11 is a series of minicomputers introduced in 1969 [1] by the Digital Equipment Corporation (DEC), in production by them from 1970-1990. Their life-time spanned a period of momentous changes in the computer world: when they were first introduced integrated circuits had just been introduced (small ones, containing only a few simple gates); and for a little less than half their life, core memory was still the standard main memory technology. By the end, the now-ubiquitous microprocessors and dynamic RAM had completely taken over.

Front panel of the KA11, the first PDP-11 model

It was the machine which made UNIX, which now seems to have taken over the world (in the form of Linux) widely known and popular.

The machine word size was 16 bits, and it was a general register architecture. Although it was not the first to feature the latter, its wide distribution (in 1980, it was the world's best-selling computer) and its novel addressing modes (below) have helped influence almost all later machines to follow that path.

(For more information about the architecture, including its innovative and much-copied stack-oriented addressing modes, see here.)

PDP-11's came in two groups: those which used the UNIBUS for a bus, and the later ones which used the QBUS. Eventually DEC stopped producing UNIBUS PDP-11's (the last were the PDP-11/44 and PDP-11/24); later 'UNIBUS' machines (the PDP-11/84 and PDP-11/94) actually contained QBUS processors with a QBUS<->UNIBUS adapter board.

Towards the end of its life, there were several microprocessor implementations of the PDP-11, as chips. After DEC discontinued production of PDP-11's, the line was sold to Mentec, who produced a few newer models.

PDP-11 Models and notes

Model Introduced Bus Type Addressing Split I & D Notes Speed (VUPS)
11/20 1969[1] UNIBUS 16-bit no
11/05 1972 UNIBUS 16-bit no OEM model
11/10[*] 1972 UNIBUS 16-bit no
11/15 1972 UNIBUS 16-bit no OEM model
11/35 1973 UNIBUS 18-bit no OEM model
11/40 1973 UNIBUS 18-bit no
11/45 1973 UNIBUS 18-bit yes core memory
11/50 1975 UNIBUS 18-bit yes MOS memory
11/55 1976 UNIBUS 18-bit yes fast bipolar memory
11/70 1975 UNIBUS 22-bit yes 0.6
11/03 1975 QBUS 16-bit no first QBUS model 0.05
11/04 1976 UNIBUS 16-bit no 0.11
11/34 1976 UNIBUS 18-bit no 0.21
11/60 1977 UNIBUS 18-bit no writable control store
11/23 1979 QBUS 18-bit or 22-bit no first F-11 0.12
11/24 1979 UNIBUS 22-bit no only UNIBUS model to use F-11 chip 0.18
11/44 1979 UNIBUS 22-bit yes last non-LSI PDP-11 0.42
11/23+ 1981 Nov QBUS 22-bit no 0.18
11/73 1983 QBUS 22-bit yes first J-11 machine, 15MHz, integrated FPU, also first PMI PDP-11 0.45
11/53 1984 QBUS 22-bit yes S-box or standard QBUS, integrated FPU, 768KiW memory 0.29
11/83 1988 QBUS 22-bit yes J-11 at 18MHz, integrated FPU 0.72
11/84 1988 UNIBUS 22-bit yes J-11 at 18MHz, integrated FPU 0.72
11/93 1990 QBUS 22-bit yes J-11 at 18MHz, integrated FPU, 2MiW onboard memory 1.0
11/94 1990 UNIBUS 22-bit yes J-11 at 18MHz, integrated FPU, 2MiW onboard memory 1.0

[*]The name PDP-11/10 was recycled by DEC from an earlier KA11 CPU-based 11/10 from 1969, or at least it existed in advertisements[1]

Operating Systems

There were a number of well-known operating systems for the PDP-11. Many were produced by DEC themselves, but several were produced by third-parties. Often DEC would purchase or re-brand such an OS and re-sell it as their own product; for example, UNIX sold as Ultrix by DEC.

UNIX was not originally a PDP-11 system (it was born on the PDP-7), but it moved to the PDP-11 shortly after it was first created, and spread widely there (since PDP-11's were common machines, due to their relatively low cost and good engineering), with the real explosion of use starting with UNIX Sixth Edition.

UNIX

These are the original Bell Laboratories releases of Unix; the first 4 were only internal to Bell, the Fifth saw limited distribution outside it, and the Sixth took over the world.

For PDP-11's without memory management.

This was the first shipping Unix distro by AT&T. It only supported the PDP-11 and VAX computers.

This version was a port of the 4.3 BSD feature set to the PDP-11. Although considered an impossible goal by many, it accomplished this by using overlays for portions of the kernel, and to allow for user programs larger than 64KB.

This last version is still supported, and if one really felt the need to load a Unix for use on a PDP-11 this would be the best fit. It has support for TCP/IP, large memory space and is the best UNIX experience one can get going to get on a 16-bit mini.

DEC OS's

Technically also an OS is XXDP, which is an 'overseer' for running the PDP-11 diagnostics produced/provided by DEC.

Real-time OS's

PDP-11's were very popular in real-time and data networking uses; a number of OS's were developed for such environments:

Miscellaneous

  • SITS - "Small ITS" for running Logo
  • Camexec - hosted the Camex typesetting system
  • Trantor - written for the MIT Applied Mathematics Department

Simulators

There a number of good simulators for the PDP-11:

The latter is less well known than the ubiquitous SIMH, but is very fast; simulated systems running on Ersatz-11 are usually faster than real PDP-11's.

New Emulator Hardware

See also

Further reading

External links

References

  1. PDP-11/20 Price List


v • d • e PDP-11 Computers and Peripherals
UNIBUS PDP-11s - PDP-11/20 • PDP-11/15 • PDP-11/35 • PDP-11/40 • PDP-11/45 • PDP-11/50 • PDP-11/55 • PDP-11/70
PDP-11/05 • PDP-11/10 • PDP-11/04 • PDP-11/34 • PDP-11/60 • PDP-11/44 • PDP-11/24 • PDP-11/84 • PDP-11/94

QBUS PDP-11s - PDP-11/03 • PDP-11/23 • PDP-11/23+ • MicroPDP-11/73 • MicroPDP-11/53 • MicroPDP-11/83 • MicroPDP-11/93

QBUS CPUs: LSI-11 • LSI-11/2 • KDF11-A • KDF11-B • KDJ11-A • KDJ11-B • KDJ11-D • KDJ11-E

Buses: UNIBUS • UNIBUS map • SPC • MUD • EUB • QBUS • CD interconnect • PMI

Also: PDP-11 architecture • PDP-11 Extended Instruction Set • FP11 floating point • PDP-11 Memory Management

UNIBUS CPUs: KA11 • KC11 • KB11-A • KB11-B • KB11-C • KB11-D • KD11-A • KD11-B • KD11-D • KD11-E • KD11-EA • KD11-K • KD11-Z • KDF11-U

Co-processors: FP11-A • FP11-B • FP11-C • FP11-E • FP11-F • KE44-A • FPF11

Chips: LSI-11 • KEV11-A • KEV11-B • KEV11-C • F-11 • KEF11-A • KTF11-A • T-11 • J-11 • FPJ11

CPU options: KE11-E • KE11-F • KJ11-A • KT11-C • KT11-D • KK11-A • KK11-B • KT24 • KTJ11-B

Rare CPU options: KS11 Memory Protection and Relocation option • KT11-B Paging Option • KUV11 Writeable Control Store

Front panels: KY11-A • KY11-D • KY11-J • KY11-LA • KY11-LB • KY11-P

More on buses: UNIBUS and QBUS termination • Bus Arbitration on the Unibus and QBUS • CTI BUS

PDT-11s - PDT-11/110 • PDT-11/130 • PDT-11/150   CTI PDP-11s - PRO-325 • PRO-350 • PRO-380

Clones: CM 1420 • SM 1420

Other: FIS floating point • PDP-11 Commercial Instruction Set • PDP-11 stacks • PDP-11 family differences

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