Difference between revisions of "PDP-11/40"

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The PDP-11/40, introduced in 1973, was the first machine to introduce 18-bit memory addressing on the PDP-11 platform.
 
 
The OEM version of the 11/40 is the 11/35.
 
 
 
{{Infobox Machine
 
{{Infobox Machine
 
| name=PDP-11/40
 
| name=PDP-11/40
 
| image=Pdp-11-40.jpg  
 
| image=Pdp-11-40.jpg  
| caption=PDP-11/40 with [[TU56]] dual [[DECtape]] drive.
+
| caption=PDP-11/40 with [[TU56 DECtape Transport|TU56]] dual [[DECtape]] drive.
| manufacturer=[[Digital Equipment Corporation]]  
+
| manufacturer=[[Digital Equipment Corporation|DEC]]  
| word size= 16 bit
+
| year introduced = January, 1973
| virtual address= 16 bit
+
| word size= 16 bits
| physical address= 18 bit
+
| virtual address= 16 bits
 +
| physical address= 18 bits
 
| bus arch= [[UNIBUS]]|
 
| bus arch= [[UNIBUS]]|
 +
| cpu = [[KD11-A CPU|KD11-A]]
 
|}}
 
|}}
  
 +
The '''PDP-11/40''', introduced in 1973, was the second machine to support 18-bit [[main memory]] [[address]]ing on the [[PDP-11]] platform, after the [[PDP-11/45]] (albeit with a subset of the [[PDP-11 Memory Management]] [[architecture]]). The [[Original Equipment Manufacturer|OEM]] version of the -11/40 is the '''PDP-11/35'''; the machines are completely identical, except for the printing on the [[front panel]] inlay.
 +
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It used the [[KD11-A CPU]], which connected to the [[KY11-D Console|KY11-D]] front panel via a pair of BC08-R [[flat cable]]s. Optional additions to the [[Central Processing Unit|CPU]] included:
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 +
* [[KT11-D Memory Management]]
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* [[KE11-E Extended Instruction Set]] ([[PDP-11 Extended Instruction Set|EIS]])
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* [[KE11-F Floating Instruction Set]] ([[FIS floating point]]
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* [[KJ11-A Stack Limit Register]]
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* [[KW11-L Line Time Clock]]
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 +
It came in two types of [[mounting box]]es: the 21" [[BA11-F Mounting Box]] (usual for the -11/40); and the 10-1/2" [[BA11-D Mounting Box]] (early units) and [[BA11-K Mounting Box]]es (later units) (usual for the -11/35).
 +
 +
An -11/40 with a special blue-themed front panel was used as the [[front end]] for the [[KL10]] CPU in [[DECsystem-10]]s and [[DECSYSTEM-20]]s - though the -11/40 panel was hidden behind a cabinet door on the -20.
 +
 +
The 11/40 was also a primary platform for early [[UNIX]].
 +
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==Configuration changes==
 +
 +
[[Image:PDP11-40-geerol.jpg|150px|thumb|right|A PDP-11/40 setup.]]
 +
 +
Early versions of the BA11-F in the -11/40 omitted the 4 fans at the bottom of the pull-out used to house the CPU, and had only the 5 fans at the top.
 +
 +
The BA11-D used 9-pin [[DEC power distribution connectors]], whereas the BA11-K used the 6-pin/15-pin pair, so presumably the [[backplane]] for the BA11-D had a different [[power harness]] than the one for the BA11-K (which it is confirmed had the 6/15-pin connectors).
 +
 +
The power harness from the [[H742 Power Supply]] was also different in later models, allowing use of an [[H754 +20V, -5V Regulator]] which provided +20V, for use with the [[MM11-U core memory]].
 +
 +
== hampage.hu ==
 +
Quoting...
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<i>
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[[Image:pdp11-40.jpg|200px|left]]
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The /40 was introduced in January, 1973. It was a higher performance version of the /20, with a [[microcode]]d multi-board CPU. 18-bit MMU (-> max. 128 kw memory), FPU and EIS/FIS (extended/floating point instruction set) were available options.
 +
 +
There was a 'graphical' workstation model of the /40, using a [[VT11 Graphic Display Processor]], marketed as the GT44. Many /40s were used in DECsystem-10's (KL10's, to be exact), as the frontend/IO-processor. These were painted differently, the panel looks awsome in blue too. (no, it's not just the frontpanel, that I like about the -11...)
 +
 +
On the picture to the left we can see two RK05's (disk pack drives) and two TU60 (DECcasette) units. <!-- On this picture we can see a close-up at the frontpanel (with bootdevice-selector panel) and the paper-tape puncher/reader. -->
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OS's at this point: DOS/BATCH, RSX11, RT-11, RSTS.
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Trivia: The 11/40 was one of the most often "cloned" machine. the soviet/tscech/polish SM-4 (CM-4), the hungarian TPA-1140 are all copies of this computer.
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</i>
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{{semi-stub}}
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==See also==
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* [[PDP-11/40E]]
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==External links==
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* [http://www.bitsavers.org/pdf/dec/pdp11/1140/DEC-11-H40SA-A-D_PDP-11_40_System_manual.pdf PDP-11/40 system manual] (DEC-11-H40SA-A-D)
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* [http://www.bitsavers.org/pdf/dec/pdp11/1140/1140_SystemManual.pdf PDP-11/40, -11/35 (21 inch chassis) system manual] (EK-11040-TM-002)
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* [http://www.bitsavers.org/pdf/dec/pdp11/1140/PDP-1140_System_Engr_Drawings_Rev_P_Jun74.pdf PDP-11/40 system engineering drawings]
  
{{stub}}
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{{PDP-11}}
  
{{Template:PDP-11}}
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[[Category: UNIBUS PDP-11s]]
[[Category:DEC processors]][[Category:UNIBUS processors]]
 

Latest revision as of 17:43, 9 March 2022


PDP-11/40
Pdp-11-40.jpg
PDP-11/40 with TU56 dual DECtape drive.
Manufacturer: DEC
Year Introduced: January, 1973
Word Size: 16 bits
CPU: KD11-A
Physical Address Size: 18 bits
Virtual Address Size: 16 bits
Bus Architecture: UNIBUS


The PDP-11/40, introduced in 1973, was the second machine to support 18-bit main memory addressing on the PDP-11 platform, after the PDP-11/45 (albeit with a subset of the PDP-11 Memory Management architecture). The OEM version of the -11/40 is the PDP-11/35; the machines are completely identical, except for the printing on the front panel inlay.

It used the KD11-A CPU, which connected to the KY11-D front panel via a pair of BC08-R flat cables. Optional additions to the CPU included:

It came in two types of mounting boxes: the 21" BA11-F Mounting Box (usual for the -11/40); and the 10-1/2" BA11-D Mounting Box (early units) and BA11-K Mounting Boxes (later units) (usual for the -11/35).

An -11/40 with a special blue-themed front panel was used as the front end for the KL10 CPU in DECsystem-10s and DECSYSTEM-20s - though the -11/40 panel was hidden behind a cabinet door on the -20.

The 11/40 was also a primary platform for early UNIX.

Configuration changes

A PDP-11/40 setup.

Early versions of the BA11-F in the -11/40 omitted the 4 fans at the bottom of the pull-out used to house the CPU, and had only the 5 fans at the top.

The BA11-D used 9-pin DEC power distribution connectors, whereas the BA11-K used the 6-pin/15-pin pair, so presumably the backplane for the BA11-D had a different power harness than the one for the BA11-K (which it is confirmed had the 6/15-pin connectors).

The power harness from the H742 Power Supply was also different in later models, allowing use of an H754 +20V, -5V Regulator which provided +20V, for use with the MM11-U core memory.

hampage.hu

Quoting...

Pdp11-40.jpg

The /40 was introduced in January, 1973. It was a higher performance version of the /20, with a microcoded multi-board CPU. 18-bit MMU (-> max. 128 kw memory), FPU and EIS/FIS (extended/floating point instruction set) were available options.

There was a 'graphical' workstation model of the /40, using a VT11 Graphic Display Processor, marketed as the GT44. Many /40s were used in DECsystem-10's (KL10's, to be exact), as the frontend/IO-processor. These were painted differently, the panel looks awsome in blue too. (no, it's not just the frontpanel, that I like about the -11...)

On the picture to the left we can see two RK05's (disk pack drives) and two TU60 (DECcasette) units.

OS's at this point: DOS/BATCH, RSX11, RT-11, RSTS.

Trivia: The 11/40 was one of the most often "cloned" machine. the soviet/tscech/polish SM-4 (CM-4), the hungarian TPA-1140 are all copies of this computer.

See also

External links