MSV11-C MOS memory - Revision history

Jnc: /* External links */ +microcomputer processor handbook

2023-07-13T18:35:23Z

‎External links: +microcomputer processor handbook

Jnc: Avoid dab

2022-09-22T12:04:49Z

Avoid dab

Jnc: covers the basics

2022-08-03T07:34:57Z

covers the basics

New page

The '''MSV11-C''' (M7955) was a [[DEC card form factor|quad]]-height [[QBUS]] [[Dynamic RAM|DRAM]] [[main memory]] card, introduced in 1975. They held 32KB when fully populated with 4Kx1 DRAM [[integrated circuit|chips]], in 4 8KB banks; several partially-populated variants were also available:

* MSV11-CA - 8-Kbyte (M7955-YA)
* MSV11-CB - 16-Kbyte (M7955-YB)
* MSV11-CC - 24-Kbyte (M7955-YC)
* MSV11-CD - 32-Kbyte (M7955-YD)

They are [[QBUS#Variable address size|Q18]] cards (hence, could not be used in Q22 systems, such as [[PDP-11/23]]'s with more than 256KB of memory). Their starting [[address]] is configured by use of [[Dual Inline Package|DIP]] switches.

They provided internal [[refresh]], instead of requiring that it be performed externally, by the [[LSI-11]] [[Central Processing Unit|CPU]], like the preceding [[MSV11-B MOS memory]] (although the MSV11-C can be configured with on-board [[jumper]]s to use external refresh).


==External links==

* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-MSV11-OP-001%20MSV11-C%20User's%20Manual.pdf MSV11-C user's manual] (EK-MSV11-OP-001)
* [http://bitsavers.org/pdf/dec/pdp11/1103/1103_Schematics.pdf PDP-11/03 Engineering Drawings] - MSV11-C Field Maintenance Print Set (MP00259) is on pp. 97-126 of the PDF
* [http://www.compsy.de/moduls/gifs/M7955.jpg M7955 MSV11-C RAM] - board image

[[Category: QBUS Memories]]

@@ Line 17: / Line 17: @@
 ==External links==
 * [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-MSV11-OP-001%20MSV11-C%20User's%20Manual.pdf MSV11-C user's manual] (EK-MSV11-OP-001)
 * [http://bitsavers.org/pdf/dec/pdp11/1103/1103_Schematics.pdf PDP-11/03 Engineering Drawings] - MSV11-C Field Maintenance Print Set (MP00259) is on pp. 97-126 of the PDF

@@ Line 9: / Line 9: @@
 They are [[QBUS#Variable address size|Q18]] cards (hence, could not be used in Q22 systems, such as [[PDP-11/23]]'s with more than 256KB of memory). Their starting [[address]] is configured by use of [[Dual Inline Package|DIP]] switches.
-They provided internal [[refresh]], instead of requiring that it be performed externally, by the [[LSI-11]] [[Central Processing Unit|CPU]], like the preceding [[MSV11-B MOS memory]] (although the MSV11-C can be configured with on-board [[jumper]]s to use external refresh).
+They provided internal [[memory refresh]], instead of requiring that it be performed externally, by the [[LSI-11]] [[Central Processing Unit|CPU]], like the preceding [[MSV11-B MOS memory]] (although the MSV11-C can be configured with on-board [[jumper]]s to use external refresh).
 <!-- ==Further reading==