My assessment, based on the serial number is a circa 1992, Taiwanese manufactured frame. Components are a bit of a mix, but the 500EX and RX100 may be original. They're certainly the correct timeframe. It would be interesting to know their date codes. If original, they were typical used on bicycles in the $500-$700 range. A typical tubeset would have been Tange Infinity. In addition to date codes, the OP should check the seat post size and, if possible, pull the fork and check the steerer for a manufacturer's stamp and date code.