KM11-A Maintenance Set - Revision history

Vaxorcist: /* Overlays */ Fixed typo

2025-10-24T07:28:39Z

‎Overlays: Fixed typo

Jnc: /* External links */ another page for the original

2023-02-27T16:49:40Z

‎External links: another page for the original

Jnc: /* External links */ +FMPS

2022-07-06T20:27:30Z

‎External links: +FMPS

Jnc: /* Overlays */ Also a KE11-A overlay

2021-10-18T22:34:51Z

‎Overlays: Also a KE11-A overlay

Jnc: /* External links */ another replica

2021-04-01T14:56:07Z

‎External links: another replica

Jnc: Better naming system

2020-10-29T15:46:04Z

Better naming system

Jnc: /* Replicas */ Add image of Shiresoft replica

2019-02-23T20:16:36Z

‎Replicas: Add image of Shiresoft replica

Jnc: /* Overlays */ FP11-C, too

2019-02-21T20:10:15Z

‎Overlays: FP11-C, too

Jnc: /* Replicas */ Add them

2019-02-21T15:36:54Z

‎Replicas: Add them

Jnc: basics, more coming

2019-02-21T03:25:38Z

basics, more coming

New page

The '''KM11-A Maintenance Set''' (also variously called the '''KM11-A Maintenance Panel''', '''KM11-A Maintenance Console''' and '''KM11-A Maintenance Cards''' in some later [[Digital Equipment Corporation|DEC]] manuals) is a device used to perform maintenance activities on early [[PDP-11]] [[Central Processing Unit|CPUs]] and some early PDP-11 [[peripheral]]s.

As produced by DEC, a KM11 consists of a W131 Maintenance Indicator Module plugged into a W130 Maintenance Connector Module; later a W131 and a W133 Driver Module. The W131 contains an array of 28 lights, three double-throw switches, and a single spring-loaded double-throw switch.

==Overlays==

A variety of overlays, specific to a CPU or peripheral, indicate the meaning of the lights, and the function of the switches, when used with that CPU or peripheral.

The CPUs which can use the KM11-A, and for which overays exist, are:

* [[KA11 CPU|KA11]]
* [[KB11]] - all models
** [[FP11-B]]
* [[KD11-A CPU|KD11-A]]
** [[KT11-D Memory Management|KT11-D]], [[KE11-E Extended Instruction Set|KE11-E]]/[[KE11-F Floating Instruction Set|KE11-F]]
* [[KD11-B CPU|KD11-B]]

Devices which support the KM11-A, and for which overays exist, are:

* [[RK11-C disk controller|RK11-C]] (2 inlays)
* [[RK11 disk controller#RK11-D|RK11-D]]
* [[TM11 magtape controller|TM11]]
* [[RX0x floppy drive|RX01]]

[[Category: PDP-11s]]

@@ Line 33: / Line 33: @@
 ==External links==
-* [http://www.bitsavers.org/pdf/dec/pdp11/1140/PDP-1140_System_Engr_Drawings_Rev_P_Jun74.pdf PDP-11/40 system engineering drawings] - the KM11 is covered on pp. 123-125
+* [http://www.bitsavers.org/pdf/dec/pdp11/1140/PDP-1140_System_Engr_Drawings_Rev_P_Jun74.pdf PDP-11/40 system engineering drawings] - the KM11 is covered on pp. 123-125 <!--
-* [http://www.psych.usyd.edu.au/pdp-11/maint_panel.html Maintenance Control Panel] - DEC's original
+* [http://www.psych.usyd.edu.au/pdp-11/maint_panel.html Maintenance Control Panel] -->
-* [http://www.shiresoft.com/products/km11/KM11%20Replica.html KM11 Replica] - Guy Sotomayor
+* [https://www.pdp-11.nl/testtools/km11-info.html Maintenance Board Set] - DEC's original
-* [http://www.ubanproductions.com/museum.html Replacement KM11 maintenance board] - Tom Uban
+* Replacements
-* [http://www.ubanproductions.com/km11x.html How to build a clone of the DEC KM11 maintenance module] - by Tony Duell
+** [http://www.shiresoft.com/products/km11/KM11%20Replica.html KM11 Replica] - Guy Sotomayor
-* [http://retrocmp.com/tools/dec-km11-maintenance-panel DEC KM11] - Jörg Hoppe
+** [http://www.ubanproductions.com/museum.html Replacement KM11 maintenance board] - Tom Uban
 [[Category: PDP-11s]]

@@ Line 33: / Line 33: @@
 ==External links==
 * [http://www.psych.usyd.edu.au/pdp-11/maint_panel.html Maintenance Control Panel] - DEC's original
 * [http://www.shiresoft.com/products/km11/KM11%20Replica.html KM11 Replica] - Guy Sotomayor

@@ Line 22: / Line 22: @@
 * [[TM11 magtape controller|TM11]]
 * [[RX01/02 floppy drive|RX01]]
 ==Replicas==

@@ Line 35: / Line 35: @@
 * [http://www.ubanproductions.com/museum.html Replacement KM11 maintenance board] - Tom Uban
 * [http://www.ubanproductions.com/km11x.html How to build a clone of the DEC KM11 maintenance module] - by Tony Duell
 [[Category: PDP-11s]]

@@ Line 21: / Line 21: @@
 * [[RK11 disk controller#RK11-D|RK11-D]]
 * [[TM11 magtape controller|TM11]]
-* [[RX0x floppy drive|RX01]]
+* [[RX01/02 floppy drive|RX01]]
 ==Replicas==
@@ Line 29: / Line 29: @@
 The original DEC KM11-A's are incredibly scarce, but they are also a very powerful diagnostic tool. So, there have been several different projects to produce replicas; see the links below.
-==Externl links==
+==External links==
 * [http://www.psych.usyd.edu.au/pdp-11/maint_panel.html Maintenance Control Panel] - DEC's original

@@ Line 7: / Line 7: @@
 A variety of overlays, specific to a CPU or peripheral, indicate the meaning of the lights, and the function of the switches, when used with that CPU or peripheral.
-The CPUs which can use the KM11-A, and for which overays exist, are:
+The CPUs which can use the KM11-A, and for which overlays exist, are:
 * [[KA11 CPU|KA11]]

← Older revision		Revision as of 20:16, 23 February 2019
Line 24:		Line 24:

	==Replicas==		==Replicas==
		+
		+	[[Image:ShiresoftKM11.jpg\|250px\|right\|thumb\|A replica KM11 from Shiresoft]]

	The original DEC KM11-A's are incredibly scarce, but they are also a very powerful diagnostic tool. So, there have been several different projects to produce replicas; see the links below.		The original DEC KM11-A's are incredibly scarce, but they are also a very powerful diagnostic tool. So, there have been several different projects to produce replicas; see the links below.

@@ Line 11: / Line 11: @@
 * [[KA11 CPU|KA11]]
 * [[KB11]] - all models
-** [[FP11-B]] (same inlay as CPU)
+** [[FP11-B Floating-Point Processor|FP11-B]]/[[FP11-C Floating-Point Processor|FP11-C]] (same inlay as CPU)
 * [[KD11-A CPU|KD11-A]]
 ** [[KT11-D Memory Management|KT11-D]], [[KE11-E Extended Instruction Set|KE11-E]]/[[KE11-F Floating Instruction Set|KE11-F]]