Difference between revisions of "MS750 Memory System"

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The MS750 Memory System consists of:
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The '''MS750 Memory System''' is the [[main memory]] for the [[VAX-11/750]]; it consists of:
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* one Memory Controller (MCM)
 
* one Memory Controller (MCM)
 
* one to eight Memory Modules
 
* one to eight Memory Modules
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The Memory Controller is a [[CMI]] Module, either L0011, L0016, or L0022 placed in CMI Slot 10.
 
The Memory Controller is a [[CMI]] Module, either L0011, L0016, or L0022 placed in CMI Slot 10.
  
The Memory Modules have their own backplane with 8 slots.
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The Memory Modules have their own [[backplane]] slots (the physical backplane itself, [[DEC part number]] 50-13821/70-16486, is shared with the [[CPU]]), 8 slots in total.
 
   
 
   
 
==VAX-11/750 Memory Controllers==
 
==VAX-11/750 Memory Controllers==
There were three different Memory Controller Modules for the [[VAX-11/750]]:
 
  
L0011
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There were three different Memory Controller Modules for the MS750:
* for up to eight [[M8728]] 256K Memory Modules = 2M max.
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----
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* L0011 - up to eight [[M8728]] 256K Memory Modules = 2M max.
L0016
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* L0016 - up to eight [[M8750]] 1M Memory Modules = 8M max.
* for up to eight [[M8750]] 1M Memory Modules = 8M max.
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* L0022 - up to two  [[M7199]] 4M Memory Modules and six [[M8750]] 1M Memory Modules = 14M max.
----
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L0022
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(14M of Memory are the architectural limit of the VAX-11/750)
* for up to two  [[M7199]] 4M Memory Modules and six [[M8750]] 1M Memory Modules = 14M max.
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----
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The earlier modules are also used with the [[MK11 memory system]] of the [[PDP-11/70]].
14M of Memory are the architectural limit of the VAX-11/750.
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==External links==
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* [http://www.bitsavers.org/pdf/dec/vax/750/EK-MS750-TD-001_VAX-11_750_Memory_System_Technical_Description_198009.pdf VAX-11/750 Memory System Technical Description] (EK-MS750-TD-001)
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* [http://www.bitsavers.org/pdf/dec/vax/750/MP01404_750_Engineering_Drawings_Memory_Controller_198206.pdf Comet Memory Unit Field Maintenance Print Set] (MP01404) - covers the L0016
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[[Category: VAXen]]
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[[Category: DEC Memories]]

Revision as of 13:05, 2 June 2022

The MS750 Memory System is the main memory for the VAX-11/750; it consists of:

  • one Memory Controller (MCM)
  • one to eight Memory Modules

The Memory Controller is a CMI Module, either L0011, L0016, or L0022 placed in CMI Slot 10.

The Memory Modules have their own backplane slots (the physical backplane itself, DEC part number 50-13821/70-16486, is shared with the CPU), 8 slots in total.

VAX-11/750 Memory Controllers

There were three different Memory Controller Modules for the MS750:

  • L0011 - up to eight M8728 256K Memory Modules = 2M max.
  • L0016 - up to eight M8750 1M Memory Modules = 8M max.
  • L0022 - up to two M7199 4M Memory Modules and six M8750 1M Memory Modules = 14M max.

(14M of Memory are the architectural limit of the VAX-11/750)

The earlier modules are also used with the MK11 memory system of the PDP-11/70.

External links