Mature versions of the Commodore, SWTPC, Atari and Apple home computer systems all featured a disk operating system ( actually called ' DOS ' in the case of the Commodore 64 ( CBM DOS ), Atari 800 ( Atari DOS ), and Apple II machines ( Apple DOS )), as did ( at the other end of the hardware spectrum, and much earlier ) IBM's System / 360, 370 and ( later ) 390 series of mainframes ( e. g., DOS / 360: Disk Operating System / 360 and DOS / VSE: Disk Operating System / Virtual Storage Extended ).

This term is applied both generically to all such machines ( such as the Java Virtual Machine and MATLAB precompiled code ), and to specific implementations, the most famous being the p-Machine of the Pascal-P system, particularly the UCSD Pascal implementation.

Category: Virtual machines

Virtual machines are separated into two major categories, based on their use and degree of correspondence to any real machine.

Virtual machines have other advantages for OS development, including better debugging access and faster reboots.

* Virtual Iron provides virtual machines for x86 that run unmodified operating systems, such as Windows, Red Hat and SUSE ; open source, implements native virtualization, which delivers near-native performance for x86 operating systems.

* James E. Smith, Ravi Nair, Virtual Machines: Versatile Platforms For Systems And Processes, Morgan Kaufmann, May 2005, ISBN 1-55860-910-5, 656 pages ( covers both process and system virtual machines )

Category: Virtual machines

* In 1999, The Matrix and later sequels explored the possibility that our world is actually a vast Virtual Reality ( or more precisely, Simulated Reality ) created by artificially intelligent machines.

* Virtual backup appliance, a virtual machine used to back up other virtual machines

Category: Virtual machines

; HP-UX 11i v3 Virtualization Server OE ( VSE-OE ): Delivers everything in BOE plus GlancePlus performance analysis and software mirroring, and all Virtual Server Environment software which includes virtual partitions, virtual machines, workload management, capacity advisor and applications.

All IBM System p5 and IBM eServer p5 machines support DLPAR ( Dynamic Logical Partitioning ) with Virtual I / O and Micro-partitioning.

* Virtual Dialysis Museum — History and pictures of dialysis machines through time

Virtual machines such as the Java virtual machine and the current Perl 5 virtual machine are also stack based.

Category: Virtual machines

Category: Virtual machines

Virtual machines that execute byte code directly or transform it further into machine code have blurred the once clear distinction between intermediate representations and truly compiled languages.

Category: Virtual machines

Category: Virtual machines

Virtual machines, just-in-time compilation, and the ability of many programming languages on some systems to directly modify machine code make the distinction abstract.

Virtual machines may deal with offending instructions by replacing them, or by simply running kernel-code in user-mode.

Virtual memory was supported on all of the machines, although using cassettes for storage made it somewhat impractical.

Banyan VINES ( for Virtual Integrated NEtwork Service ) was a computer network operating system and the set of computer network protocols it used to talk to client machines on the network.

Such a description language can be based on any computer programming language, such as Lisp, Pascal, or Java Virtual Machine bytecode.

Virtual manipulatives can be easily accessed on the Internet as stand-alone applets, allowing for easy access and use in a variety of educational settings.

Java applets can run in a Web browser using a Java Virtual Machine ( JVM ), or in Sun's AppletViewer, a stand-alone tool for testing applets.

Java applications are typically compiled to bytecode ( class file ) that can run on any Java Virtual Machine ( JVM ) regardless of computer architecture.

* Virtual Machine Image-cloud users can upload a machine image of their own with MySQL installed, or use a ready-made machine image with an optimized installation of MySQL on it, such as the one provided by Amazon EC2.

* Returnil Virtual System can virtualize Windows based systems, needs only a restart to rebuild the virtual machine.

Virtual reality ( VR ) is a term that applies to computer-simulated environments that can simulate physical presence in places in the real world, as well as in imaginary worlds.

Virtual reality can trace its roots to the 1860s, when 360-degree art through panoramic murals began to appear.

Virtual reality enables heritage sites to be recreated extremely accurately, so that the recreations can be published in various media.

Vassal is in turn an outgrowth of the VASL ( Virtual ASL ) project, and uses Java, making it accessible to any computer that can run a modern JVM, while the other three are Microsoft Windows programs.

Examples of configuration changes that one can do from a managed switch include: enable features such as Spanning Tree Protocol, set port bandwidth, create or modify Virtual LANs ( VLANs ), etc.

The ADB Virtual Gateway uses software that resides within the middleware and is based on open standards, including DLNA home networking and the DTCP-IP standard, to ensure that all content, including paid-for encrypted content like Pay TV services, can only be accessed by secure CE devices.

Virtual storage can refer to:

Virtual room and online file cabinets can persist for years.

Virtual reality ( VR ) is a term that applies to computer-simulated environments that can simulate physical presence in places in the real world, as well as in imaginary worlds.

Virtual teams are also becoming increasingly popular with workers who want to work at home, which can increase employee engagement.

Today, it can be viewed on the Internet as a panorama or as a QuickTime Virtual Reality ( QTVR ) panorama.

Using the Virtual Vector Architecture, several POWER5 processors can act together as one vector processor.

Virtual classrooms and meetings can often use a mix of communication technologies.

A Virtual Machine can run multiple processes.

* Virtual service desk: for organisations having multi-country locations – can be situated and accessed from anywhere in the world due to advances in network performance and telecommunications, reducing operational costs and improving usage of available resources.

Rosenberg developed one of the first known AR systems, called Virtual Fixtures, while working at the U. S. Air Force Armstrong Labs in 1991, and published first study of how an AR system can enhance human performance.

" Virtual sex "-- in which two people are able to have sex with each other through virtual reality, or in which a human can have sex with a " simulated " partner that only exists on a computer — becomes a reality.

Virtual team members can be located across a country or across the world, rarely meet face-to-face, and include members from different cultures.