Difference between revisions of "PDP-11/40"

From Computer History Wiki
Jump to: navigation, search
(front panel + cables)
(14 intermediate revisions by 2 users not shown)
Line 4: Line 4:
 
| caption=PDP-11/40 with [[TU56]] dual [[DECtape]] drive.
 
| caption=PDP-11/40 with [[TU56]] dual [[DECtape]] drive.
 
| manufacturer=[[Digital Equipment Corporation]]  
 
| manufacturer=[[Digital Equipment Corporation]]  
 +
| year introduced = January, 1973
 
| word size= 16 bit
 
| word size= 16 bit
 
| virtual address= 16 bit
 
| virtual address= 16 bit
 
| physical address= 18 bit
 
| physical address= 18 bit
 
| 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 memory addressing 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.
 +
 +
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.
 +
 +
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 [[front panel]] was used as the front-end for the [[KL10]] 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]].
 +
 +
==Configuration changes==
 +
 
[[Image:PDP11-40-geerol.jpg|150px|thumb|right|A PDP-11/40 setup.]]
 
[[Image:PDP11-40-geerol.jpg|150px|thumb|right|A PDP-11/40 setup.]]
  
The PDP-11/40, introduced in 1973, was the first machine to introduce 18-bit memory addressing on the PDP-11 platform.
+
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 [[Central Processing Unit|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...
 +
<i>
 +
[[Image:pdp11-40.jpg|200px|left]]
 +
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. -->
  
The OEM version of the 11/40 is the 11/35.  A special 11/40 with a blue front panel was used as the front-end for the KL-10 in DECSystem-10s and DECSystem-20s---though the 11/40 panel was hidden behind a cabinet door on the 20.
+
OS's at this point: DOS/BATCH, RSX11, RT-11, RSTS.
  
The 11/40 was also the primary platform for early [[UNIX]].
+
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.
 +
</i>
  
 +
==Further reading==
  
 +
* EK-11040-TM-002, ''PDP-11/40, -11/35 (21 inch chassis) system manual''
  
 +
{{semi-stub}}
  
{{stub}}
+
{{PDP-11}}
  
{{Template:PDP-11}}
+
[[Category: UNIBUS PDP-11s]]
[[Category:DEC processors]][[Category:UNIBUS processors]]
 

Revision as of 04:51, 10 March 2021


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


The PDP-11/40, introduced in 1973, was the second machine to support 18-bit 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.

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

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 front panel was used as the front-end for the KL10 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.

Further reading

  • EK-11040-TM-002, PDP-11/40, -11/35 (21 inch chassis) system manual