The MicroVAX II,  was a mid-range MicroVAX introduced in May 1985. It ran VAX/VMS or, alternatively, ULTRIX, the DEC native Unix operating system.

It used the KA630-AA CPU module, a quad-height Q22-Bus module, which featured a MicroVAX 78032 microprocessor and a MicroVAX 78132 floating-point coprocessor operating at 5 MHz (200 ns cycle time). Two gate arrays on the module implemented the external interface for the microprocessor, Q22-bus interface and the scatter-gather map for DMA transfers over the Q22-Bus. The module also contained 1 MB of memory, an interval timer, two ROMs for the boot and diagnostic facility, a DZ console serial line unit and a time-of-year clock. A 50-pin connector for a ribbon cable near the top left corner of the module provided the means by which more memory was added to the system.

Our example features a TK50 cartridge tape drive and an RD54 Winchester hard drive - which unfortunately may be faulty. The machine is running VMS 5.4.

Manufacturer: Digital Equipment Corporation
Date: May 1985

This exhibit has a reference ID of CH40924. Please quote this reference ID in any communication with the Centre for Computing History.