Processor Board Part no :- 51403299-100 Assy. No :- 51305517-100 Series: TDC 3000 This is an LCNP4G card for the GUS station. This card provides the interface between the PC and the LCN, and is the main component making the station a GUS rather than a standard PC. The LCNP4(x) uses the faster 68040 microprocessor and has 16 MW of memory. A connection for a GPS time sync source for controlling the LCN time was introduced with the LCNP4G and continued with the LCNP4M.