Charon-PAR is a hardware virtualization layer running under Linux on industry standard servers. It emulates a range of historic HP3000 and HP9000 hardware and provides the ability for any existing user of such systems to move to modern Intel-based server hardware.
Modern software operating systems contain a hardware abstraction layer (HAL). The HAL creates a software layer on top of the hardware to "virtualize" the functionality of the hardware components. The Charon-PAR products are essentially HALs of complete historic HP3000 or HP9000 hardware, including their PCI-based I/O devices. They are precise models of the legacy hardware, and contain modules which emulate the legacy hardware CPUs, console subsystem, buses and I/O adapters, disks and tapes.
The installation of Charon-PAR on a general purpose host platform provides an exact model of the historic HP3000 or HP9000 hardware. On this 'virtual' system you install your legacy operating system and the associated applications, just as though you were using the original hardware. In most cases, no changes of the software are required. The Charon-PAR emulated systems run the same binary code as the historic HP3000 and HP9000 hardware and the same I/O drivers as the original hardware. This is illustrated in the following image: