Abstract: A system and method for configuring a virtual computing environment to operate in direct interrupt mode; receiving a triggering event triggering a transition from direct interrupt mode to virtual interrupt mode; copying contents of a physical interrupt queue into a virtual interrupt queue; acknowledging vectors present in the physical interrupt queue; and transitioning the virtual computing environment to virtual interrupt mode. The system includes a processor for performing the steps of the method.

Abstract: A system and method for configuring a virtual computing environment to operate in direct interrupt mode; receiving a triggering event triggering a transition from direct interrupt mode to virtual interrupt mode; copying contents of a physical interrupt queue into a virtual interrupt queue; acknowledging vectors present in the physical interrupt queue; and transitioning the virtual computing environment to virtual interrupt mode. The system includes a processor for performing the steps of the method.

Abstract: A method includes receiving, from a requesting guest environment, a device call requesting access to a device; sending the device call to an emulating guest environment, the emulating guest environment emulating the device; receiving, from the emulating guest environment, a result of the device call; and sending the result of the device call to the requesting guest environment.

Abstract: A method includes receiving, from a requesting guest environment, a device call requesting access to a device; sending the device call to an emulating guest environment, the emulating guest environment emulating the device; receiving, from the emulating guest environment, a result of the device call; and sending the result of the device call to the requesting guest environment.

Abstract: A method for transmitting data to a RTOS environment via a virtual machine environment (VME) includes at least one virtual I/O service, and a custom remote procedure call for relaying calls and call responses between the RTOS and the native HOS by invoking HOS services by means of a proxy, to a non-blocking message queue. A notification is generated and transmitted from the I/O to an interrupt emulator. An interrupt is generated and includes an identifier of the I/O and triggers the RTOS to poll the non-blocking message queue to retrieve data. Relaying the interrupt to the RTOS via a hardware exception handler emulator, which makes the interrupts and an exception appear as if they had occurred on the RTOS natively. Relaying the data to the RTOS when a poll for the data is received at the non-blocking message queue. The VME includes a supervisory instruction emulator for emulating instructions.

Abstract: According to embodiments described in the specification a virtual machine environment (VME) for interfacing a real time operating system (RTOS) environment with a native host operating system (HOS) is described.

Abstract: A PC-based PBX incorporating preexisting call control software designed to operate in a computing environment which is not PC-based. The PC-based PBX comprises a PC chassis; a PC motherboard within the chassis; a main PBX control card within the chassis for executing the preexisting call control software; a telecommunications card within the chassis and connected to the PBX main control card for implementing telephony communications with a public switched telephone network under control of the call control software; and a DSP card within the chassis and connected to the PBX main control card for implementing signaling and conferencing functions under control of the call control software.

Abstract: The invention is a floated gimbal instrument platform that provides a stable optical path for optical instruments. The instrument platform has an outer vessel with a transparent viewing port, an inner vessel also with a transparent viewing port, a transparent suspending fluid filling the outer vessel and in which the inner vessel floats in neutral buoyancy, an optical instrument secured inside the inner vessel, spacing studs which centrally position the inner vessel within the outer vessel, and jets which align the second viewing port with the first viewing port, the jets being used to rotate the inner vessel in the suspending fluid. Any misalignment between the viewing ports can be compensated by rotating the inner vessel and any translational forces applied to the platform is dampened by the fluid, thereby eliminating jitter.