Abstract: A system and method for fault injection utilizing boundary scan includes the provision of an additional fault injection register to the standard JTAG architecture in order to allow the intentional introduction of faults into a device or module forming part of a system under test. Through the use of the fault injection register of the present invention, faults may be intentionally introduced and the system response to such faults monitored and analyzed independently of the system software and without the use of mechanical probes or the like for introducing the fault. The system and method of the present invention is readily integrated with the existing test functions of the standard IEEE 1149.1 boundary scan architecture.

Abstract: An apparatus and method for mounting a range finding instrument to a theodolite telescope incorporates the necessary geometry to enable a linear spring assembly to be able to accurately balance the mass of the range finder and theodolite combination rotating in a vertical plane about a pivot point defining a first axis. In a particular embodiment of the mounting system, two compression springs are mounted in a single straight spring tube which is attached to the range finder but is allowed to rotate about a second axis. The resultant geometry of the arrangement provides a substantially exact balance for the weight of the range finder irrespective of the vertical angle of the theodolite telescope.

Abstract: A synchronous first-in, first-out ("FIFO") having an alterable buffer store includes a dual-ported, random access memory ("RAM") based memory device incorporating conventional "empty" and "full" flags while also providing an alternate mode of operation in which the inhibiting effects of the "empty" and "full" flags are disabled whereby information contained within the FIFO may be modified before being read out. The alternate mode of operation is particularly useful in asynchronous transfer mode ("ATM") networking applications.