Abstract: A system, apparatus and methods for forming tufted articles can include a hollow needle tufting machine for forming patterned tufted articles including multiple colors of yarns. The hollow needle tufting machine can include a series of hollow needles arranged along a needle bar at a gauge spacing and will receive a series of different color and/or types of yarns from a yarn feed system. A funnel block having a series of funnels configured to receive a series of yarns will be provided adjacent the needle bar for directing selected yarns to a corresponding or associated hollow needle. The hollow needles will be reciprocated into and out of a backing to deliver a series of yarns; and can be engaged by corresponding knives to form tufts of yarns. The knives can be moved between no-cut and cutting positions to form loop and cut pile tufts of yarns in the backing.

Abstract: A fault-tolerant computer system employs a pseudo-filesystem to dynamically manage the hardware components. A directory which appears as a standard, hierarchical directory in this filesystem contains a file for each component; each file maps to either a hardware component or a software module. The pseudo-filesystem hierarchy is determined during system initialization and is automatically updated whenever the software or hardware configuration changes. The pseudo-filesystem, called /config filesystem herein, is implemented as a Unix filesystem in the Unix filesystem switch. This pseudo-filesystem method may be implemented in a fault-tolerant, redundant computer system configuration having multiple identical CPUs executing the same instruction stream, with multiple, identical memory modules in the address space of the CPUs storing duplicates of the same data. The system detects faults in the CPUs and memory modules, and places a faulty unit offline while continuing to operate using the good units.

Abstract: A computer system in a fault-tolerant configuration employs multiple identical CPUs executing the same instruction stream, with multiple, identical memory modules in the address space of the CPUs storing duplicates of the same data. The system detects faults in the CPUs and memory modules, and places a faulty unit offline while continuing to operate using the good units. The faulty unit can be replaced and reintegrated into the system without shutdown. The multiple CPUs are loosely synchronized, as by detecting events such as memory references and stalling any CPU ahead of others until all execute the function simultaneously; interrupts can be synchronized by ensuring that all CPUs implement the interrupt at the same point in their instruction stream. Memory references via the separate CPU-to-memory busses are voted at the three separate ports of each of the memory modules. I/O functions are implemented using two identical I/O busses, each of which is separately coupled to only one of the memory modules.