Table of Contents

General Description

VAX Hardware Virtualization allows users of HP VAX (Previously known as DIGITAL VAX) computers to move application software and user data to a non-VAX platform without having to make changes to software and data. VAX Hardware Virtualization is a software solution that replaces VAX hardware.

This approach is best understood when the VAX Hardware Virtualization Software is viewed as a special interface between the old VAX software and a new hardware platform. Basically, the CHARON software presents a VAX hardware interface to the original VAX software, so that the existing software cannot detect a difference. This means no changes have to be made to the existing software. User programs and data can be copied to a new modern industry standard server (64-bit or 32-bit Intel or AMD) and continue to run for many more years.

The VAX virtualization software is designed to replace single and multi-CPU VAX computer systems, including:

MicroVAX II
MicroVAX 3600
MicroVAX 3900
MicroVAX 3100 models 96 and 98
VAXserver 3600
VAXserver 3900
VAXstation 4000 models 90, 106, 108, 700 and 705
VAX 6310
VAX 6610, 6620, 6630, 6640, 6650 and 6660

The principles of VAX Hardware Virtualization

In order to make the correct decisions regarding how to apply VAX Hardware Virtualization or Emulation, it is important to make a distinction between the VAX hardware that is virtualized or emulated and the (non-VAX) hardware from the (non-VAX) hardware host platform that carries the VAX Virtualization Software.

Virtualized hardware

CHARON-VAX virtualizes various VAX architectures and meets or exceeds the performance level of these VAX systems when run on the recommended hardware platform. Our VAX emulator product currently contains the following VAX models:

MicroVAX II
MicroVAX 3600
MicroVAX 3900
VAXserver 3600 (depending on license supports up to 512 MB of emulated memory)
VAXserver 3900 (depending on license supports up to 512 MB of emulated memory)
MicroVAX 3100 models 96 and 98
VAX 4000 models 106, 108, 700 and 705
VAXstation 4000 model 90
VAX 6310
VAX 6610
VAX 6620
VAX 6630
VAX 6640
VAX 6500
VAX 6660

The following table explains which hardware boards we virtualize:

Subsystem	Covered VAX hardware
Serial Lines Controllers	UART, QUART, CXA16, CXB16, CXY08, DHQ11, DHV11, DZV11, DZQ11, DL11, DLV11, DZ11, DHW42-AA, DHW42-BA, DHW42-CA
QBUS Disks/Tapes Controllers	RQDX3, KDB50, TQK50, TUK50, KDM70
SCSI Controllers	NCR53C94
DSSI Subsystem	SHAC, HSD50
CI Subsystem	CIXCD, HSJ50
IEEE488/GPIB adapter	IEQ11
Network Controllers	DEQNA, DESQA, DELQA, DEUNA, DELUA, DEMNA, DEBNI, PMADAA

Host platform

The Virtualization Software presents standard VAX devices to the VAX operating system, allowing the OS to function as though it were still running on a VAX computer. For example, virtual disk container files in a directory or device files in /dev directory of the host Linux platform are presented by the Virtualization Software to the VAX OS as emulated SCSI disks attached to a SCSI adapter.

With the use of current storage technology, disks do not have to be physically attached to the Host platform, they can also reside on a SAN or iSCSI storage structure.

A similar translation process is also valid for other emulated hardware devices.

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