PDP-8/E - Revision history

Jnc: Reverted edits by Larsbrinkhoff (talk) to last revision by Jnc

2023-07-14T12:11:11Z

Reverted edits by Larsbrinkhoff (talk) to last revision by Jnc

Larsbrinkhoff: 12-bit cat.

2023-07-11T11:45:32Z

12-bit cat.

Jnc: /* External links */ +Good collector site

2023-05-11T14:18:43Z

‎External links: +Good collector site

Jnc: /* Images */ +Another image

2022-04-11T12:25:07Z

‎Images: +Another image

Jnc: 4KW initially

2021-11-07T15:16:38Z

4KW initially

Jnc: create MM8-E page, tweaks

2021-11-07T14:02:12Z

create MM8-E page, tweaks

Jnc: Use DEC term

2021-09-19T13:10:11Z

Use DEC term

Jnc: mention MC8/E name

2021-09-18T23:32:38Z

mention MC8/E name

Jnc: Also MC8/E?

2021-09-18T12:19:04Z

Also MC8/E?

Jnc: backplane

2021-03-12T20:40:54Z

backplane

← Older revision		Revision as of 12:11, 14 July 2023
Line 67:		Line 67:

	[[Category: PDP-8s]]		[[Category: PDP-8s]]
−	~~[[Category: 12-bit Computers]]~~

← Older revision		Revision as of 11:45, 11 July 2023
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	[[Category: PDP-8s]]		[[Category: PDP-8s]]
		+	[[Category: 12-bit Computers]]

@@ Line 60: / Line 60: @@
 * [https://ethw.org/First-Hand:PDP-8/E_OMNIBUS_Ride First-Hand:PDP-8/E OMNIBUS Ride] - PDP-8/E Design Story
 * [https://hack42.nl/wiki/Digital_PDP-8f Digital PDP-8F]
 * [https://www.cs.drexel.edu/~bls96/museum/pdp8.html PDP-8/M Restoration Project]

← Older revision		Revision as of 12:25, 11 April 2022
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	[[Image:PDP-8'M_BrianStuart.jpg\|400px\|PDP-8/M from Brian Stuart's collection]]		[[Image:PDP-8'M_BrianStuart.jpg\|400px\|PDP-8/M from Brian Stuart's collection]]
		+
		+	[[:File:PDP 8 e Trondheim.jpg\|Another image]]

	==External links==		==External links==

@@ Line 29: / Line 29: @@
 The '''PDP-8/F''' was a cost-reduced version of the -8/E with the same [[Central Processing Unit|CPU]], but only a single OMNIBUS [[backplane]]. The '''PDP-8/M''' is the [[Original Equipment Manufacturer|OEM]] version of the PDP-8/F. Both the /E and /M used the H9191-9216 20-slot [[DEC card form factor|quad]]-width OMNIBUS backplane.
-The -8/E-F-M's KK8-E CPU consists of five [[DEC card form factor|quad]] boards (M8300 Major Registers, M8310 Register Control, M8320 Bus Loads, M8330 Timing Generator, M8560 [[Teletype]] Control); its standard [[main memory]] was the [[MM8-E Memory System]] [[core memory]], which came in 4KW blocks.
+The -8/E-F-M's KK8-E CPU consists of five [[DEC card form factor|quad]] boards (M8300 Major Registers, M8310 Register Control, M8320 Bus Loads, M8330 Timing Generator, M8560 [[Teletype]] Control); its standard [[main memory]] was the [[MM8-E Memory System]] [[core memory]], which initially came in 4K [[word]] blocks.
 Options included:
 * KA8-E Positive I/O Bus Interface, to allow use of older PDP-8 devices
-* KM8-E Memory Extension and Time-Share Option, which provided the [[bank switching]] needed to support more than 4K [[word]]s of memory, and allowed the computer to operate in either Executive Mode or User Mode (some sources refer to this as the 'MC8/E' - probably by analogy with earlier [[PDP-8 Memory Extension units]] such as the MC8/I and MC8/L - but no DEC documentation refers to that name)
+* KM8-E Memory Extension and Time-Share Option, which provided the [[bank switching]] needed to support more than 4KW of memory, and allowed the computer to operate in either Executive Mode or User Mode (some sources refer to this as the 'MC8/E' - probably by analogy with earlier [[PDP-8 Memory Extension units]] such as the MC8/I and MC8/L - but no DEC documentation refers to that name)
 * MP8-E Memory Parity
 * KD8-E [[OMNIBUS|Data Break]] Interface

@@ Line 18: / Line 18: @@
 | memory speed = 1.2 μseconds
 | bus arch = [[OMNIBUS]]
-| memory mgmt = bank selection, CPU mode
+| memory mgmt = [[bank switching|bank selection]], CPU mode
 | operating system = [[OS/8]], [[TSS/8]]
 | predecessor = [[PDP-8/I]]
@@ Line 27: / Line 27: @@
 The '''PDP-8/E''' was an improved model in the [[PDP-8 family|PDP-8 line]] from [[Digital Equipment Corporation|DEC]], and introduced the [[OMNIBUS]] for interfacing to [[device controller]]s.
-The '''PDP-8/F''' was a cost-reduced version of the -8/E with the same [[Central Processing Unit|CPU]] and [[core memory|core]] [[main memory]], but only a single OMNIBUS [[backplane]]. The '''PDP-8/M''' is the [[Original Equipment Manufacturer|OEM]] version of the PDP-8/F. Both the /E and /M used the H9191-9216 20-slot [[DEC card form factor|quad]] OMNIBUS backplane.
+The '''PDP-8/F''' was a cost-reduced version of the -8/E with the same [[Central Processing Unit|CPU]], but only a single OMNIBUS [[backplane]]. The '''PDP-8/M''' is the [[Original Equipment Manufacturer|OEM]] version of the PDP-8/F. Both the /E and /M used the H9191-9216 20-slot [[DEC card form factor|quad]]-width OMNIBUS backplane.
-The -8/E-F-M's KK8-E [[Central Processing Unit|CPU]] consists of five [[DEC card form factor|quad]] boards (M8300 Major Registers, M8310 Register Control, M8320 Bus Loads, M8330 Timing Generator, M8560 [[Teletype]] Control); the MM8-E core memory that was standard on the -8/E consisted of sets of three quad boards (G227 X-Y Driver and Current Source, G104 Sense/Inhibit, H220 Memory Stack).
+The -8/E-F-M's KK8-E CPU consists of five [[DEC card form factor|quad]] boards (M8300 Major Registers, M8310 Register Control, M8320 Bus Loads, M8330 Timing Generator, M8560 [[Teletype]] Control); its standard [[main memory]] was the [[MM8-E Memory System]] [[core memory]], which came in 4KW blocks.
 Options included:
 * KA8-E Positive I/O Bus Interface, to allow use of older PDP-8 devices
-* KM8-E Memory Extension and Time-Share Option, which was needed to support more than 4K [[word]]s of memory, and allowed the computer to operate in either Executive Mode or User Mode (some sources refer to this as the 'MC8/E' - probably by analogy with earlier [[PDP-8 Memory Extension units]] such as the MC8/I and MC8/L - but no DEC documentation refers to that name)
+* KM8-E Memory Extension and Time-Share Option, which provided the [[bank switching]] needed to support more than 4K [[word]]s of memory, and allowed the computer to operate in either Executive Mode or User Mode (some sources refer to this as the 'MC8/E' - probably by analogy with earlier [[PDP-8 Memory Extension units]] such as the MC8/I and MC8/L - but no DEC documentation refers to that name)
 * MP8-E Memory Parity
 * KD8-E [[OMNIBUS|Data Break]] Interface
@@ Line 55: / Line 55: @@
 * [http://www.bitsavers.org/pdf/dec/pdp8/pdp8e/ PDP-8/E documents]
 ** [http://www.bitsavers.org/pdf/dec/pdp8/pdp8e/PDP-8E_IPB_Feb74.pdf PDP-8/E Illustrated Parts Breakdown]
 * [https://ethw.org/First-Hand:PDP-8/E_OMNIBUS_Ride First-Hand:PDP-8/E OMNIBUS Ride] - PDP-8/E Design Story
 * [https://hack42.nl/wiki/Digital_PDP-8f Digital PDP-8F]