  This paper presents an overview of recent progress at the Sydney University
Stellar Interferometer (SUSI). Development of the third-generation PAVO beam
combiner has continued. The MUSCA beam combiner for high-precision differential
astrometry using visible light phase referencing is under active development
and will be the subject of a separate paper. Because SUSI was one of the
pioneering interferometric instruments, some of its original systems are old
and have become difficult to maintain. We are undertaking a campaign of
modernization of systems: (1) an upgrade of the Optical Path Length Compensator
IR laser metrology counter electronics from a custom system which uses an
obsolete single-board computer to a modern one based on an FPGA interfaced to a
Linux computer - in addition to improving maintainability, this upgrade should
allow smoother motion and higher carriage speeds; (2) the replacement of the
aged single-board computer local controllers for the siderostats and the
longitudinal dispersion compensator has been completed; (3) the large beam
reducing telescope has been replaced with a pair of smaller units with separate
accessible foci. Examples of scientific results are also included.
