PDP-7 - Revision history

Jnc: Replace Bell Labs link with local article

2025-06-30T20:15:49Z

Replace Bell Labs link with local article

Jnc: 7/7A difference

2025-04-24T16:16:13Z

7/7A difference

Jnc: /* External links */ +one from Paul Allen's collection at the LCM

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‎External links: +one from Paul Allen's collection at the LCM

Jnc: +Nav DEC

2023-07-11T12:35:42Z

+Nav DEC

Larsbrinkhoff: 18-bit cat.

2023-07-11T11:39:20Z

18-bit cat.

Jnc: build total

2022-11-29T14:12:03Z

build total

Jnc: /* External links */ +PDP-7 Definition

2022-04-05T23:10:59Z

‎External links: +PDP-7 Definition

Larsbrinkhoff: Link to new pages PDP-7 Unix and Space Travel.

2021-08-24T05:46:27Z

Link to new pages PDP-7 Unix and Space Travel.

Jnc: /* External links */ add BitSavers

2021-05-13T14:06:06Z

‎External links: add BitSavers

Jnc: /* External links */ +PDP-7 brochure

2021-05-12T14:37:20Z

‎External links: +PDP-7 brochure

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 The PDP-7 was the third of Digital's 18-bit machines, with essentially the same [[instruction set]] and [[architecture]] as the predecessor [[PDP-4]] and successor [[PDP-9]]. It was the first [[wire-wrap]]ped PDP. It was the first to use their [[FLIP CHIP|Flip-Chip®]] technology, but also included the older [[System Module]]s.
-In 1969, Ken Thompson wrote the first [[UNIX]] system in assembly language on a PDP-7, then named Unics as a somewhat treacherous pun on [[Multics]], as the operating system for [https://www.bell-labs.com/usr/dmr/www/spacetravel.html Space Travel],  a game which required graphics to depict the motion of the planets. A PDP-7 was also the development system used during the development of [[MUMPS]] at [[MGH]] in [[Boston]] a few years earlier.
+In 1969, Ken Thompson wrote the first [[UNIX]] system in assembly language on a PDP-7, then named Unics as a somewhat treacherous pun on [[Multics]], as the operating system for [[Space Travel]], a game which required graphics to depict the motion of the planets. A PDP-7 was also the development system used during the development of [[MUMPS]] at [[MGH]] in [[Boston]] a few years earlier.
-There are a few remaining PDP-7's still in operable condition.  One under restoration in Oslo, Norway, has been thrown away.
+There are a few remaining PDP-7's still in operable condition. One under restoration in Oslo, Norway, has recently been thrown away.
 == Emulation ==
-The PDP-7 can be emulated with [[SIMH]]. DECSys, [[PDP-7 Unix|Unix]], [[Space Travel]] and some other software is available and can run on the emulator.
+The PDP-7 can be emulated with [[SIMH]]. DECSys, [[PDP-7 Unix|Unix]], Space Travel and some other software is available and can run on the emulator.
 {{wp-orig}}

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 {{Infobox Machine
 | name = PDP-7
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 | logic type = PNP [[Transistor]] [[FLIP CHIP]]s
 <!--| design type = -->
-<!-- | clock speed =  μsec (basic instructions) -->
+<!--| clock speed =  μsec (basic instructions) -->
 | memory speed = 1.75 μsec
 <!-- | memory mgmt = bounds register -->
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 | caption = A PDP-7 in Oslo, Norway
 }}
+The '''PDP-7''' is a [[minicomputer]] produced by [[Digital Equipment Corporation|DEC]], introduced in 1965; with a low cost, it was cheap but powerful. There were two models, the second being the -7/A, but the difference between them is not yet certain; one report is that the I/O system of the latter was re-designed to use the lower speed (and thus lower cost) 'R' series [[FLIP CHIP]]s. Approximately 120 are thought to have been built.
 The PDP-7 was the third of Digital's 18-bit machines, with essentially the same [[instruction set]] and [[architecture]] as the predecessor [[PDP-4]] and successor [[PDP-9]]. It was the first [[wire-wrap]]ped PDP. It was the first to use their [[FLIP CHIP|Flip-Chip®]] technology, but also included the older [[System Module]]s.
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 The PDP-7 can be emulated with [[SIMH]]. DECSys, [[PDP-7 Unix|Unix]], [[Space Travel]] and some other software is available and can run on the emulator.
 ==External links==
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 <!-- * http://heim.ifi.uio.no/~toresbe/dec PDP-7 restoration project located in Oslo, Norway -->
 * [https://onlineonly.christies.com/s/firsts-history-computing-paul-g-allen-collection/pdp-7a-minicomputer-117/230055 PDP-7A minicomputer] - from [[Paul Allen]]'s collection at the [[Living Computer Museum|LCM]], includes several images
 {{Nav DEC}}

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 * [http://www.linfo.org/pdp-7.html PDP-7 Definition]
 <!-- * http://heim.ifi.uio.no/~toresbe/dec PDP-7 restoration project located in Oslo, Norway -->
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 {{Nav DEC}}
-[[Category:DEC Systems]]
+[[Category: DEC Systems]]
 [[Category: 18-bit Computers]]

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 {{semi-stub}}
 [[Category:DEC Systems]]
 [[Category: 18-bit Computers]]

← Older revision		Revision as of 11:39, 11 July 2023
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	[[Category:DEC Systems]]		[[Category:DEC Systems]]
		+	[[Category: 18-bit Computers]]

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 }}
-The '''PDP-7''' is a [[minicomputer]] produced by [[Digital Equipment Corporation|DEC]], introduced in 1965; with a low cost, it was cheap but powerful. There were two models, the second being the -7/A, but the difference is not yet clarified.
+The '''PDP-7''' is a [[minicomputer]] produced by [[Digital Equipment Corporation|DEC]], introduced in 1965; with a low cost, it was cheap but powerful. There were two models, the second being the -7/A, but the difference is not yet clarified. Approximately 120 are thought to have been built.
 The PDP-7 was the third of Digital's 18-bit machines, with essentially the same [[instruction set]] and [[architecture]] as the predecessor [[PDP-4]] and successor [[PDP-9]]. It was the first [[wire-wrap]]ped PDP. It was the first to use their [[FLIP CHIP|Flip-Chip®]] technology, but also included the older [[System Module]]s.

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 <!-- original http://www.bell-labs.com/history/unix/pdp7.htmlnow offline -->
 * [http://research.microsoft.com/~gbell/Digital/timeline/1964-3.htm DIGITAL Computing Timeline - 1964] - PDP-7 entry
 <!-- * http://heim.ifi.uio.no/~toresbe/dec PDP-7 restoration project located in Oslo, Norway -->

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 * [https://www.soemtron.org/pdp7.html Digital Equipment Corporation PDP-7] - Extensive site with a large amount of material
 * [http://belllabs-microsite-unixhistory.s3-website-us-west-2.amazonaws.com/pdp7.html ''"The famous PDP-7 comes to the rescue"''] (Bell Labs' Unix history)
 <!-- original http://www.bell-labs.com/history/unix/pdp7.htmlnow offline -->