PDP-11/40 - Revision history

Ashlin4010: Fix formatting of Infobox (I broke it last edit)

2025-12-24T09:11:55Z

Fix formatting of Infobox (I broke it last edit)

Ashlin4010: Added section about diagnostic software for the PDP-11/40

2025-12-24T07:41:00Z

Added section about diagnostic software for the PDP-11/40

Jnc: /* External links */ +PDP-11/10-40 Price List

2024-10-11T20:20:29Z

‎External links: +PDP-11/10-40 Price List

Jnc: Make the image smaller

2024-02-08T17:08:20Z

Make the image smaller

Jnc: /* External links */ +PDP-11/40 Technical Memo Index & Abstracts

2023-05-16T16:12:19Z

‎External links: +PDP-11/40 Technical Memo Index & Abstracts

Jnc: list CPU options

2022-03-09T15:43:04Z

list CPU options

Jnc: Various minor format tweaks

2021-10-18T13:41:49Z

Various minor format tweaks

Jnc: front panel + cables

2021-03-10T03:51:33Z

front panel + cables

Jnc: /* Manuals */ typo

2020-04-11T13:59:40Z

‎Manuals: typo

Jnc: +Manuals

2020-04-11T13:58:52Z

+Manuals

@@ Line 11: / Line 11: @@
 | 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.

@@ Line 4: / Line 4: @@
 | imgwidth = 200px
 | caption=PDP-11/40 with [[TU56 DECtape Transport|TU56]] dual [[DECtape]] drive.
 | manufacturer=[[Digital Equipment Corporation|DEC]]
 | year introduced = January, 1973
 | word size= 16 bits
@@ Line 11: / Line 11: @@
 | 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.
@@ Line 28: / Line 28: @@
 The 11/40 was also a primary platform for early [[UNIX]].
-==Configuration changes==
+==Configuration Changes==
 [[Image:PDP11-40-geerol.jpg|150px|thumb|right|A PDP-11/40 setup]]
@@ Line 37: / Line 37: @@
 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 ==

@@ Line 61: / Line 61: @@
 ==External links==
 * [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)
 * [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)

@@ Line 1: / Line 1: @@
 {{Infobox Machine
 | name=PDP-11/40
 | image=Pdp-11-40.jpg
 | caption=PDP-11/40 with [[TU56 DECtape Transport|TU56]] dual [[DECtape]] drive.
 | manufacturer=[[Digital Equipment Corporation|DEC]]
@@ Line 11: / Line 12: @@
 | 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.
@@ Line 30: / Line 30: @@
 ==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]]
 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.

@@ Line 64: / Line 64: @@
 * [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)
 * [http://www.bitsavers.org/pdf/dec/pdp11/1140/PDP-1140_System_Engr_Drawings_Rev_P_Jun74.pdf PDP-11/40 system engineering drawings]
 {{PDP-11}}
 [[Category: UNIBUS PDP-11s]]

@@ Line 14: / Line 14: @@
 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.
-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 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:
 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]] [[Central Processing Unit|CPU]] in [[DECsystem-10]]s and [[DECSYSTEM-20]]s - though the -11/40 panel was hidden behind a cabinet door on the -20.
+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]].

@@ Line 12: / Line 12: @@
 |}}
-The '''PDP-11/40''', introduced in 1973, using the [[KD11-A CPU]], 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 '''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.
-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).
@@ Line 47: / Line 47: @@
 </i>
-==Manuals==
+==Further reading==
-* EK-11040-TM-002, 'PDP-11/40, -11/35 (21 inch chassis) system manual'
+* EK-11040-TM-002, ''PDP-11/40, -11/35 (21 inch chassis) system manual''
 {{semi-stub}}

@@ Line 46: / Line 46: @@
 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>
 {{semi-stub}}