These number representations are used for Xerox Data Systems (XDS), previously known as Scientific Data Systems, Sigma 5 computers.
These floating point numbers are represented by one bit for the sign (S),
7 bits for the exponent, and 24 bits for the fraction. The exponent
is to the base 16 (not 2), and has a bias of 64. Negative
floating point numbers are the two's complement of the positive
representation.
SINGLE PRECISION is shown below:
Sigma 5 Floating Point Format  
S  Exponent  Fraction  
































DOUBLE PRECISION adds another 32 bits of fraction in the following 32 bits.
NOTE that the Fraction, F, is
Comparing numbers with many leading zeroes in F may lead to erroneous
results.
INTEGER numbers are 32 bits long, and are in two's complement.