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M7624-AL CPU KA640 Mayfair II

The M7624-AL is an alternative multiuser motherboard for the QBUS-based MicroVAX 3300/3400; it contains the CPU (a CVAX chip), 4 Mbyte of main memory, a DSSI secondary storage device controller, and an Ethernet network interface.

It differs from other MicroVAX 3300/3400 motherboards in the main memory ICs used, in this case ICs from Hitachi.

There were other versions, too, e.g. the "-AF" version, which used main memory ICs from Toshiba.