MS750 Memory System

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

• VAX-11/750 Memory System Technical Description (EK-MS750-TD-001)
• Comet Memory Unit Field Maintenance Print Set (MP01404) - covers the L0016