VAX Emulation: A Quick Summary

vtVAX software runs on a modern computer system to recreate a DEC VAX computer.

vtVAX emulates the VAX CPU and storage and communications device adapters. It translates VAX instructions and I/O requests into Intel x86 architecture equivalents, passes them on to the host hardware for processing, then returns the results to the VMS operating system. To ensure your applications will run as expected, the compatibility of the vtVAX emulation with the DEC VAX hardware has been tested using the original VAX hardware design tools and diagnostics.

VMS and your VMS-based applications run without modification in the virtual VAX. No porting, re-compiling or re-linking are required. The first step after installing vtVAX is to define the desired virtual hardware configuration using the management tool provided.

Next, all data from your VAX disks is copied to the new host platform. Then simply boot the virtual VAX in the same way as the native VAX system. It really is that easy! The existing software runs as-is, meaning that in many cases re-certification is not required. This can result in significant cost and time savings for those in regulated industries.

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How does the transition work?

The process flow of a VAX replacement involves the following steps:

  1. Install vtVAX on a host system of your choice;
  2. Create a virtual equivalent of the VAX you want to replace using the Management Tool;
  3. Copy the content of your VAX disks to the virtual VAX;
  4. Continue your operation as before.

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