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.
 
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The OEM version of the 11/40 is the 11/35.  The 11/40 with a blue front panel was also used as the front-end for the KL-10.
 
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{{Infobox Machine
 
{{Infobox Machine
 
| name=PDP-11/40
 
| name=PDP-11/40
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| image=Pdp-11-40.jpg  
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| image=Pdp-11-40.jpg
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| caption=PDP-11/40 with [[TU56]] dual [[DECtape]] drive.
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| imgwidth = 200px
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| manufacturer=[[Digital Equipment Corporation]]  
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| caption=PDP-11/40 with [[TU56 DECtape Transport|TU56]] dual [[DECtape]] drive.
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| word size= 16 bit
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| manufacturer=[[Digital Equipment Corporation|DEC]]  
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| virtual address= 16 bit
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| year introduced = January, 1973
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| physical address= 18 bit
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| word size= 16 bits
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| virtual address= 16 bits
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| physical address= 18 bits
 
| bus arch= [[UNIBUS]]|
 
| bus arch= [[UNIBUS]]|
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| cpu = [[KD11-A CPU|KD11-A]]
 
|}}
 
|}}
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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).
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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.
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The 11/40 was also a primary platform for early [[UNIX]].
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==Configuration changes==
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[[Image:PDP11-40-geerol.jpg|150px|thumb|right|A PDP-11/40 setup]]
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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.
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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).
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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]].
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== hampage.hu ==
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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.
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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...)
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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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* [https://iamvirtual.ca/collection/systems/minis/PDP11-10/PDP11-10--PriceList.pdf PDP-11/10-40 Price List] (January 1, 1973)
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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]
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* [http://www.bitsavers.org/pdf/dec/pdp11/memos/700925_PDP-1140_Technical_Memo_Index.pdf PDP-11/40 Technical Memo Index & Abstracts] - interesting overview of a series of design memos (most also available) on the -11/40
  
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{{stub}}
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{{PDP-11}}
  
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{{Template:PDP-11}}
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[[Category: UNIBUS PDP-11s]]
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[[Category:DEC processors]][[Category:UNIBUS processors]]
 

Latest revision as of 21:20, 11 October 2024


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


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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