DEC 7000 AXP, VAX 7000 Technical Bulletin Number 4

This document, "VAX 7000 Technical Bulletin Number 4," dated October 1995, accompanies the release of the KA7AC CPU module for VAX 7000/10000 systems.

Primarily intended for system managers and service engineers, its purpose is to update the existing VAX 7000/10000 documentation set with new information regarding the KA7AC module.

Key information includes:

• Performance Improvements: The KA7AC module uses the NV5 CPU chip, implemented in CMOS-5 technology, with a chip speed of 170.9 MHz, offering improved performance over earlier KA7AA (91 MHz) and KA7AB (137.5 MHz) modules.
• System Upgrades: Details how to upgrade VAX 7000/10000 systems from KA7AA or KA7AB modules to KA7AC, or add KA7AC modules to existing systems.
• Compatibility Requirements: States that VAX systems using KA7AC modules require OpenVMS VAX Version 6.1 or later, and a Console Revision V4.1 or later.
• Technical Updates: Provides user information on changes to internal processor registers, specifically detailing the KA7AC BIU Control Register (BIU_CTL) and its bit definitions for operations related to P-cache, B-cache, and I/O mapping.