KA650 Main Memory System - Revision history

Jnc: Adopt formal group name syntax

2024-05-23T13:53:52Z

Adopt formal group name syntax

Jnc: Not only used in Personal VAXen

2024-05-07T10:55:09Z

Not only used in Personal VAXen

Jnc: +New cats

2024-05-07T00:32:42Z

+New cats

Jnc: No MicroVAX III

2023-03-31T15:39:00Z

No MicroVAX III

Jnc: Jnc moved page KA650 Memory Subsystem to KA650 Main Memory System: Formal DEC name

2022-06-17T22:05:36Z

Jnc moved page KA650 Memory Subsystem to KA650 Main Memory System: Formal DEC name

Jnc: Better intro paragraph, link to docs online

2022-06-17T22:04:16Z

Better intro paragraph, link to docs online

Jnc: link renamed;

2022-06-17T08:21:41Z

link renamed;

Jnc: Jnc moved page DEC KA650 Memory Subsystem to KA650 Memory Subsystem without leaving a redirect: Follow naming system

2022-06-17T07:58:34Z

Jnc moved page DEC KA650 Memory Subsystem to KA650 Memory Subsystem without leaving a redirect: Follow naming system

Jnc: Better cat, add links

2021-08-23T13:11:36Z

Better cat, add links

Jzatarski: added another link to youtube video detailing memory troubleshooting process

2020-05-16T16:43:25Z

added another link to youtube video detailing memory troubleshooting process

@@ Line 1,340: / Line 1,340: @@
 [[Category: VAX Memories]]
-[[Category: MicroVAXen]]
+[[Category: MicroVAX Systems]]
-[[Category: QBUS VAXen]]
+[[Category: QBUS VAX Systems]]

@@ Line 1,341: / Line 1,341: @@
 [[Category: VAX Memories]]
 [[Category: MicroVAXen]]
 [[Category: QBUS VAXen]]

← Older revision		Revision as of 00:32, 7 May 2024
Line 1,339:		Line 1,339:
	* [https://youtu.be/3LxTJIzow2k Youtube - VAXStation 3200: More RAM Repair]		* [https://youtu.be/3LxTJIzow2k Youtube - VAXStation 3200: More RAM Repair]

−	~~<!-- ==References==~~
−	~~-->~~
	[[Category: VAX Memories]]		[[Category: VAX Memories]]
		+	[[Category: MicroVAXen]]
		+	[[Category: Personal VAXen]]
		+	[[Category: QBUS VAXen]]

@@ Line 1: / Line 1: @@
-The '''KA650 Main Memory System''' is the [[main memory]] sub-system of the [[MicroVAX III]], which is built around the [[KA650 CPU]]. It is split between the [[Central Processing Unit|CPU]] card, which contains the main memory controller, and a number of MS650 boards; they communicate over the MS650 memory interconnect.
+The '''KA650 Main Memory System''' is the [[main memory]] sub-system for the [[VAX]] [[KA650 CPU]], and later [[KA655 CPU]]. It is split between the [[Central Processing Unit|CPU]] card, which contains the main memory controller, and a number of MS650 boards; they communicate over the MS650 memory interconnect.
 This page contains notes on troubleshooting, repair, and theory of operation of the KA650 Main Memory System.
@@ Line 5: / Line 5: @@
 ==Overview==
-The MS650-AA and MS650-BA memory module are intended to be used with the KA650 [[VAX]] CPU, as the name might suggest. These quad width cards contain 8MB and 16MB of RAM for the VAX, respectively, complete with [[error-correcting code|ECC]].
+The MS650-AA and MS650-BA memory modules were intended to be used with the KA650 CPU, as the name might suggest. These [[DEC card form factor|quad]]-width [[printed circuit board|cards]] contain 8MB and 16MB of RAM for the VAX, respectively, complete with [[error-correcting code|ECC]].
 ==Theory of Operation==

@@ Line 1: / Line 1: @@
-This page contains notes on troubleshooting, repair, and theory of operation of the [[KA650 CPU|KA650]]/[[MS650]] [[main memory]] subsystem.
+The '''KA650 Main Memory System''' is the [[main memory]] sub-system of the [[MicroVAX III]], which is built around the [[KA650 CPU]]. It is split between the [[Central Processing Unit|CPU]] card, which contains the main memory controller, and a number of MS650 boards; they communicate over the MS650 memory interconnect.
 ==Overview==
-The MS650-AA and MS650-BA memory module are intended to be used with the KA650 [[VAX]] [[Central Processing Unit|CPU]], as the name might suggest. These quad width cards contain 8MB and 16MB of RAM for the VAX, respectively, complete with [[error-correcting code|ECC]].
+The MS650-AA and MS650-BA memory module are intended to be used with the KA650 [[VAX]] CPU, as the name might suggest. These quad width cards contain 8MB and 16MB of RAM for the VAX, respectively, complete with [[error-correcting code|ECC]].
 ==Theory of Operation==
@@ Line 1,332: / Line 1,334: @@
 ==External Links==
 * [https://youtu.be/eDMhdAEFEgc Youtube - KA650 Memory Troubleshooting]
 * [https://youtu.be/3LxTJIzow2k Youtube - VAXStation 3200: More RAM Repair]
-==References==
+<!-- ==References==
 -->
 [[Category: VAX Memories]]

← Older revision	Revision as of 22:05, 17 June 2022
(No difference)

@@ Line 1: / Line 1: @@
-This page contains notes on troubleshooting, repair, and theory of operation of the [[DEC KA650]]/[[MS650]] [[main memory]] subsystem.
+This page contains notes on troubleshooting, repair, and theory of operation of the [[KA650 CPU|KA650]]/[[MS650]] [[main memory]] subsystem.
 ==Overview==
-The MS650-AA and MS650-BA memory module are intended to be used with the [[DEC KA650]] [[VAX]] [[Central Processing Unit|CPU]], as the name might suggest. These quad width cards contain 8MB and 16MB of RAM for the VAX, respectively, complete with [[error-correcting code|ECC]].
+The MS650-AA and MS650-BA memory module are intended to be used with the KA650 [[VAX]] [[Central Processing Unit|CPU]], as the name might suggest. These quad width cards contain 8MB and 16MB of RAM for the VAX, respectively, complete with [[error-correcting code|ECC]].
 ==Theory of Operation==
@@ Line 10: / Line 10: @@
 ====Memory Control Signals Provided by the CMCTL====
-The CMCTL [[integrated circuit|IC]] is the [[Dynamic RAM|DRAM]] controller for the KA650 CPU. It has 10 [[address]] line outputs, 39 memory data I/O lines (MD), 4 CAS outputs, 4 RAS outputs, a WE pin, and an SE pin. Also available to the RAM card are the inverse of the 20th and 21st address lines (XA20 & XA21), which are used as bank selection when using 256kxX DRAM chips. The data lines are provided to the RAM cards through a 50 conductor [[flat cable|ribbon cable]], while the rest of the control lines are provided through the CD interconnect on the backplane. [[#KA650-print-set|[1]]]
 The 10 address lines carry the row address on the rising edge of a RAS line, followed by the column address on the rising edge of a CAS line.

← Older revision	Revision as of 07:58, 17 June 2022
(No difference)

← Older revision		Revision as of 16:43, 16 May 2020
Line 1,332:		Line 1,332:

	* [https://youtu.be/eDMhdAEFEgc Youtube - KA650 Memory Troubleshooting]		* [https://youtu.be/eDMhdAEFEgc Youtube - KA650 Memory Troubleshooting]
		+	* [https://youtu.be/3LxTJIzow2k Youtube - VAXStation 3200: More RAM Repair]

	==References==		==References==