Dennis Lee Bieber <wlfr...@ix.netcom.com> wrote: > >On 22 Sep 2012 01:36:59 GMT, Steven D'Aprano wrote: >> >> For non IEEE 754 floating point systems, there is no telling how bad the >> implementation could be :( > > Let's see what can be found... > > IBM 360: Same as Sigma-6 (no surprise; hearsay is the Sigma was >designed by renegade IBM folk; even down to using EBCDIC internally -- >but with a much different interrupt system [224 individual interrupt >vectors as I recall, vs the IBM's 7 vectors and polling to find what >device]).
The Control Data 6000/Cyber series had sign bit and 11-bit exponent, with either a 48-bit mantissa or a 96-bit mantissa, packed into one or two 60-bit words. Values were not automatically normalized, so there was no assumed 1 bit, as in IEEE-754. -- Tim Roberts, t...@probo.com Providenza & Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
