Virtual Operating Systems

The latest articles related to Virtual Operating Systems

Genera (operating system) – Genera operating system

Symbolics developed new Lisp Machines and published the operating system under the name ”Genera”. Genera 8.5 is the latest version. Symbolics Genera has been developed from the early 1980s to the early 1990s. In the recent years there were mostly patches developed and very little new functionality. Symbolics developed Genera based on this foundation of [...]

Microkernel – Introduction

microkernel is the near-minimum amount of software that can provide the mechanisms needed to implement an operating system. These mechanisms include low-level address space management, thread management, and inter-process communication(I.P.C). As an operating system design approach, microkernels permit typical operating system services, such as device drivers, protocol stacks, file systems and user interface code, to [...]

Ring (computer security) – Implementations

Hardware supported rings were among the most revolutionary concepts introduced by the Multics operating system, a highly secure predecessor of today’s UNIX family of operating systems. However, most general-purpose systems use only two rings, even if the hardware they run on provides more CPU modes than that. For example, Windows XP and below only uses [...]

Hypervisor – Mainframe origins

The first hypervisor providing full virtualization, IBM’s one-off research CP-40 system, began production use in January 1967, and became the first version of IBM’s CP/CMS operating system. CP-40 ran on a one-off S/360-40 that was customized to support virtualization. Prior to this time, computer hardware had only been virtualized enough to allow multiple user applications [...]

Microphone array – Introduction

microphone array is any number of microphones operating in tandem. There are many applications: *Systems for extracting voice input from ambient noise (notably telephones, speech recognition systems, hearing aids) *Surround sound and related technologies *Locating objects by sound: acoustic source localization, e.g. military use to locate the source(s) of artillery fire. Aircraft location and tracking. [...]

Windows Driver Model – VxD, WDM and Windows 98

Windows 98 based operating systems (Windows 98, Windows 98 Second Edition, and Windows Me) are able to use both WDM and VxD (Virtual device driver) driver standards. Both drivers models can provide unique and different features for the same hardware. However, usually the newer WDM standard provides more features. For example, if a TV tuner [...]

Device fingerprint – Limitations

Collection of device fingerprints from web clients (browser software) relies on the availability of JavaScript or similar client-side scripting language for the harvesting of a suitably large number of parameters. Two classes of users with limited client-side scripting are those with mobile devices, and those running privacy software. A separate issue is that a single [...]

Computer file – Storing files

The discussion above describes a file as a concept presented to a user or a high-level operating system. However, any file that has any useful purpose, outside of a thought experiment, must have some physical manifestation. That is, a file (an abstract concept) in a real computer system must have a real physical analogue if [...]

Virtual airline – Operation

Technology has improved since the introduction of BBS-operated virtual airlines, allowing a wider variety of tools and resources available to virtual pilots, enhancing realism of flight simulation. Pilots can now fly online using networks such as VATSIM or IVAO. While connected to the network, pilots can see other aircraft, hear and respond to Air Traffic [...]

Intelligent workload management – Definition of Workload

In the context of IT systems and data center management, a “workload” can be broadly defined as “the total requests made by users and applications of a system.” However, it is also possible to break down the entire workload of a given system into sets of self-contained units. Such a self-contained unit constitutes a “workload” [...]

QEMU – Introduction

QEMU is a processor emulator that relies on dynamic binary translation to achieve a reasonable speed while being easy to port on new host CPU architectures. In conjunction with CPU emulation, it also provides a set of device models, allowing it to run a variety of unmodified guest operating systems; it can thus be viewed [...]

Private Disk – Feature highlights

* NIST-certified implementation of AES-256-bit, and SHA-2. Private Disk complies with FIPS 197 and FIPS 180-2 * Disk Firewall, an application-level filter, which allows only trusted programs to access the virtual drive * File wiping is applied when deleting an encrypted image * PD File Move, a file migration tool, which will locate the specified [...]

Data General Nova – Introduction

Data General Nova was a popular 16-bit minicomputer built by the American company Data General starting in 1969. The Nova was packaged into a single rack mount case and had enough power to do most simple computing tasks. The Nova became popular in science laboratories around the world, and eventually 50,000 units were sold. It [...]

Ixemul.library – Limitations

The library does not emulate the BSD system API in its entirety. Some of the signals, such as SIGSTOP, are missing. The use of some process control functions, such as fork, cannot be fully implemented due to the Amiga’s lightweight, non-virtual memory system; instead, more lightweight versions, such as vfork, are utilized. The library does [...]









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