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Since each user can run whatever bingo operating system they want, this type of virtual machine allows bingonova users to do things like run two different operating systems (sometimes referred to as "guests") on bingonova their "private" virtual computers. Also, experimental new versions of operating systems bingo can be run at the same time as older, more stable, versions, bingo each in a separate virtual machine. The process can even be recursive; IBM debugged new versions of its virtual machine operating system, VM, in bingonova virtual machine running under an older version of VM.
One early user of this bingonova concept was the IBM VM/CMS time-sharing product, which used a relatively simple interactive computing single-user operating system, CMS, which ran on top of VM. In that way, CMS bingonova could be written "play bingo" simply, as if it were running alone, and the VM operating system quietly provided multitasking and resource management services behind the scenes.
Not all VM users had to run CMS, though; some preferred to run some bingo form of OS/360 (or eventually MVS) in one or more virtual machines, to provide traditional batch processing services to those users who wanted that. VM is still used today on IBM "play bingo" mainframes, and in some which are used as Web servers, the operating system run in each of many virtual machines is Linux.
The plex86 and VMware packages bingo do the same thing on modern PCs, trapping all hardware accesses and simulating all of a motherboard except for the processor.
The x86 processor architecture bingonova as used in modern PCs does not actually meet the Popek and Goldberg virtualization requirements. Notably, there is no execution mode where all privileged machine instructions bingonova always trap, which "play bingo" would allow per-instruction virtualization. As a result, VMware and similar virtualization software for the x86 must dynamically recompile privileged mode code. This technique incurs some performance overhead as compared to a VM running on a bingo natively virtualizable architecture such as the IBM System/370 or bingo Motorola MC68020. Intel and AMD have each announced plans to add x86 virtualization capabilities to future x86 bingo bingo processors (see Vanderpool).
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Some of this class of virtual machines are emulators; these allow software written for one bingonova machine to run on another. Emulation for computer systems can include emulation for both different machine architectures, and operating systems.
Others produce behaviors and capabilities of a machine that doesn't necessarily exist as an actual piece of hardware but may only be a detailed specification. For example, the p-Code machine bingo specification (one of the first, used for support of Pascal) was a description of a specific set of capabilities and behaviors that bingonova programmers could use to write programs that would run on any computer running virtual machine software that correctly implemented the specification.
More modern examples include the bingo specification of the Java virtual machine and the Common Language Infrastructure virtual machine at the heart of the Microsoft .NET initiative.
These allow diverse computers all to run software written to that specification; the virtual machine software itself must be written separately for each type of computer on which it runs.
