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VAX and PDP11 Hardware Virtualization allows users of HP VAX and PDP11 (Previously known as DIGITAL VAX and PDP11) computers to move application software and user data to a modern Intel or AMD based x86 compatible platform without having to make changes to software and data. VAX and PDP11 Hardware Virtualization is a software solution that replaces VAX and PDP11 hardware. 

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This approach is best understood when the VAX and PDP11 Hardware Virtualization Software is viewed as a special interface between the old VAX and PDP11 software and a new hardware platform.  Basically, the CHARON software presents a VAX and PDP11 hardware interface to the original VAX and PDP11 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.

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The Virtualization Software presents standard VAX and PDP11 devices to the VAX and PDP11 operating system, allowing the OS to function as though it were still running on a VAX and PDP11 computer. For example, virtual disk container files in a directory or physical devices of the host Windows platform are presented by the Virtualization Software to the VAX and PDP11 OS as emulated SCSI disks attached to a SCSI adapter.

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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.

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