Difference between revisions of "MS750 Memory System"
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(MS750-HB used the then-new L0022 Memory Controller Module) |
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The Memory Controller Module connects to the /750's [[CPU/Memory Interconnect]] [[bus]], and also to an internal memory bus - which does not seem to have a formal name - which runs to the memory array modules' slots. | The Memory Controller Module connects to the /750's [[CPU/Memory Interconnect]] [[bus]], and also to an internal memory bus - which does not seem to have a formal name - which runs to the memory array modules' slots. | ||
| − | The Memory Controller Module (either L0011, L0016, or L0022) resides in a custom slot in the main | + | The Memory Controller Module (either L0011, L0016, or L0022) resides in a custom slot in the main [[backplane]]; slot 10. The memory array modules have their own slots in a dedicated section of the backplane, 8 slots in total. (The physical backplane itself, [[DEC part number]] 50-13821/70-16486, is shared with the [[Central Processing Unit|CPU]]). |
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| + | A later version, the '''MS750-HB''' which used the then-new L0022 Memory Controller Module, allowed the use of up to two M7199 4MB memory array modules; the older Memory Controller Modules were restricted to smaller memory array modules. | ||
| − | == | + | ==MS750 Memory Controllers== |
[[Image:256KBMemoryArray.jpg|thumb|200px|right|256KB module]] | [[Image:256KBMemoryArray.jpg|thumb|200px|right|256KB module]] | ||
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The earlier array modules are also used with the [[MK11 memory system]] of the [[PDP-11/70]]. | The earlier array modules are also used with the [[MK11 memory system]] of the [[PDP-11/70]]. | ||
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| + | ==Further reading== | ||
| + | |||
| + | * ''MS750-HB User Guide'' (EK-MS75H-UG-001) - not online (yet; coming soon, we hope) | ||
| + | * ''MS750-HB Field Maintenance Print Set'' (MP-02061) - not online | ||
==External links== | ==External links== | ||
Latest revision as of 16:32, 12 August 2024
The MS750 Memory System is the main memory for the VAX-11/750; it consists of:
- one Memory Controller module (MCM)
- one to eight memory array modules
The Memory Controller Module connects to the /750's CPU/Memory Interconnect bus, and also to an internal memory bus - which does not seem to have a formal name - which runs to the memory array modules' slots.
The Memory Controller Module (either L0011, L0016, or L0022) resides in a custom slot in the main backplane; slot 10. The memory array modules have their own slots in a dedicated section of the backplane, 8 slots in total. (The physical backplane itself, DEC part number 50-13821/70-16486, is shared with the CPU).
A later version, the MS750-HB which used the then-new L0022 Memory Controller Module, allowed the use of up to two M7199 4MB memory array modules; the older Memory Controller Modules were restricted to smaller memory array modules.
MS750 Memory Controllers
There were three different Memory Controller Modules for the MS750:
- L0011 - up to eight M8728 256KB memory array modules = 2MB max.
- L0016 - up to eight M8750 1MB memory array modules = 8MB max.
- L0022 - up to two M7199 4MB memory array modules and six M8750 1MB memory array modules = 14MB max.
(14MB of Memory is the architectural limit of the VAX-11/750)
The earlier array modules are also used with the MK11 memory system of the PDP-11/70.
Further reading
- MS750-HB User Guide (EK-MS75H-UG-001) - not online (yet; coming soon, we hope)
- MS750-HB Field Maintenance Print Set (MP-02061) - not online
External links
- VAX-11/750 Memory System Technical Description (EK-MS750-TD-001)
- VAX-11/750 Installation Manual (EK-SI75F-IN-001) - the MS750 is covered in Chapter 9 (pp. 131-132 of the PDF)
- Comet Memory Unit Field Maintenance Print Set (MP01404) - covers the L0016
- M8750 Field Maintenance Print Set (MP01398) - very faint scans
- 11/730-Z Field Maintenance Print Set (MP01270) - the M8750 is covered in MS730-C Field Maintenance Print Set (MP01366) (pp. 292-12 of the PDF)
- L0016 (MCM) - Memory Control image
