The significant difference is that as borland describes it's pascal real 6-byte method, the mantissa 39-bits are sandwiched inbetween a single sign bit in front (msb), and the exp byte at the end (lsb). In turbo pascal, as described in the link you've given me, the exponent and sign bit are in front, mantissa in back. This would definetly explain the output I've been seeing. Thanks again...