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From: lusol@vax1.cc.lehigh.edu
Newsgroups: comp.arch
Subject: Re: Floating-point formats
Message-ID: <92.27564819@vax1.cc.lehigh.edu>
Date: 30 Nov 90 16:52:56 GMT
Organization: Lehigh University
Lines: 23


Floating point information for current CDC CYBERs running NOS/VE:

64-bit single precision, accurate to 15 digits, with a magnitude ranging from
-5.2E+1232 to +5.2E+1232.  Smallest negative number apporoximately -4.8E-1234,
smallest positive number approximately 4.8E-1234.

One coefficient sign bit, a 15-bit signed exponent biased by 4000(16), and a
48 bit coefficient. Two's complement.

128-bit double precision, ranging from -5.221944407065762533458763552E+1232 to
5.221944407065762533458763552E+1232, accurate to about 29 digits.  Remaining 48
bits of the 96-bit coefficient stored in the next word.


Integers on a CYBER are signed 64-bit quantities, ranging from
-9223372036854775808 to 9223372036854775807.  Two's compliment.

More info in the CDC CYBER 180 state Hardware reference Manual.

Steve

Stephen.O.Lidie@CDC1.CC.Lehigh.EDU


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