Difference between revisions of "PDP-11"

Revision as of 18:49, 13 February 2009

The PDP-11 is a series of computers introduced in 1970 by Digital Equipment Corporation (DEC).

A loaded PDP-11/23 PLUS

The machine word size was 16 bits. For more information about the architecture itself, see PDP-11 architecture.

It could run a variety of operating systems. Many were produced by DEC themselves, but several were produced by third-parties. Often DEC would purchase or rebrand this OS and resell it as their own product. For example, UNIX sold as Ultrix by DEC.

Operatingn Systems

Unix based Operating Systems

Unix System 4

Unix System 5

Unix System 6

Unix System 7

System III

BSD 2.0

This was the first shipping unix distro by the CSRG. It included a few fixes, and a bunch of the BSD utilities. This released was based on Unix System 6.

BSD 2.1

BSD 2.2

BSD 2.3

BSD 2.4

BSD 2.5

BSD 2.6

BSD 2.7

BSD 2.8

BSD 2.9

This version was a port of the 4.3 feature set to the PDP-11. Although considered impossible by many, it accomplished this by using overlays for portions of the kernel, and exe's to allow for programs larger then 64kb.

BSD 2.10

BSD 2.11

This version is still supported, and if you really felt the need to load a Unix for use on a PDP-11 this would be the best fit. It has support for TCP/IP, large memory space and is the best UNIX experence you are going to get on a 16bit mini.

Other OS's

PDP-11 Models and notes

Model	Introduced	Bus Type	Addressing	Notes
11/20	1970	UNIBUS	16-bit
11/05	1972	UNIBUS	16-bit
11/10	1972	UNIBUS	16-bit
11/15	1972	UNIBUS	16-bit	OEM model
11/40	1973	UNIBUS	18-bit
11/45	1973	UNIBUS	18-bit	core memory
11/50	1975	UNIBUS	18-bit	MOS memory
11/70	1975	UNIBUS	22-bit
11/03	1975	QBUS	16-bit	first QBUS model, first F-11
11/34	1976	UNIBUS	18-bit
11/04	1976	UNIBUS	16-bit
11/55	1976	UNIBUS	18-bit	fast bipolar memory
11/60	1977	UNIBUS	18-bit	writable control store
11/23	1979	QBUS	18-bit or 22-bit
11/24	1979	UNIBUS	22-bit	first UNIBUS model to use F-11 chip
11/44	1979	UNIBUS	22-bit	last non-LSI PDP-11
11/23+	1981 Nov	QBUS	22-bit
11/73	1983	QBUS	22-bit	first J-11 machine, 15MHz, integrated FPU, also first PMI PDP-11
11/53	1984	QBUS	22-bit	S-box or standard qbus, integrated FPU, 768KiW memory
11/83	1988	QBUS	22-bit	J-11 at 18MHz, integrated FPU
11/84	1988	UNIBUS	22-bit	J-11 at 18MHz, integrated FPU
11/93	1990	QBUS	22-bit	J-11 at 18MHz, integrated FPU, 2MiW onboard memory
11/94	1990	UNIBUS	22-bit	J-11 at 18MHz, integrated FPU, 2MiW onboard memory

This article is a stub. You can help by expanding it.

@@ Line 1: / Line 1: @@
-{{stub}}
 The PDP-11 is a series of computers introduced in 1970 by [[DEC|Digital Equipment Corporation (DEC)]].[[Image:PDP1123PLUS-01.jpeg|right|thumb|200px|A loaded PDP-11/23 PLUS]]
@@ Line 6: / Line 5: @@
 It could run a variety of operating systems.  Many were produced by [[DEC]] themselves, but several were produced by third-parties.  Often DEC would purchase or rebrand this OS and resell it as their own product.  For example, [[UNIX]] sold as [[Ultrix]] by DEC.
-=== PDP-11 Models and notes ===
+== Operatingn Systems ==
+=== Unix based Operating Systems ===
+==== Unix System 4 ====
+==== Unix System 5 ====
+==== Unix System 6 ====
+==== Unix System 7 ====
+==== System III ====
+==== BSD 2.0 ====
+This was the first shipping unix distro by the [[CSRG]].  It included a few fixes, and a bunch of the BSD utilities.  This released was based on [[Unix System 6]].
+==== BSD 2.1 ====
+==== BSD 2.2 ====
+==== BSD 2.3 ====
+==== BSD 2.4 ====
+==== BSD 2.5 ====
+==== BSD 2.6 ====
+==== BSD 2.7 ====
+==== BSD 2.8 ====
+==== BSD 2.9 ====
+This version was a port of the 4.3 feature set to the PDP-11.  Although considered impossible by many, it accomplished this by using overlays for portions of the kernel, and exe's to allow for programs larger then 64kb.
+==== BSD 2.10 ====
+==== BSD 2.11 ====
+This version is still supported, and if you really felt the need to load a Unix for use on a PDP-11 this would be the best fit.  It has support for TCP/IP, large memory space and is the best UNIX experence you are going to get on a 16bit mini.
+=== Other OS's ===
+== PDP-11 Models and notes ==
 {| border="1"
 ! Model !! Introduced !! Bus Type !! Addressing !! Notes
@@ Line 57: / Line 88: @@
 |}
+{{stub}}
 {{PDP-11}}
 [[Category:DEC Computer Systems]]