MS630-BB, and MS630-CA are quad-height modules. These modules use 256 Kb DRAMs and are protected by byte-parity, with the parity logic located on the module. The modules connect to the CPU module via the backplane through the C and D rows and a 50-conductor ribbon cable. The backplane serves as the address bus and the ribbon cable as the data bus.

The MicroVAX II came in three models of enclosure:
* BA23
* BA123
* 630QE - A deskside enclosure.

DEC at the same time also announced the VAXstation

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