robin wrote:
(snip regarding HER, HDR, and the lack of normalization in the early
versions of S/360.)
> Except, of course, initially for HER and HDR. The 1964 Principles of
Operation
> makes this clear.
> Indeed, the RCA Spectra (and the EE System 4 which was a licenced
copy)
> did not normalize in the case of HER and HDR. That never changed for
the
> EE Systrem 4 (I don't know what RCA subsequently did for the Spectra.)
> Nor did the System 4 retrofit a guard digit on d.p.
Well, one could always add zero, still probably faster than divide,
but if you always need to do that it makes (made) more sense to fix it.
It might be that there would be use for HU and HW, the obvious
mnemonics for unnormalized versions, but I can't think of them right now.
-- glen
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