ASM370 - Re: S/360

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Author

Re: S/360

multicsfan

2006-01-17, 7:57 am

glen herrmannsfeldt wrote:
[snip]

> Maybe, but I doubt this was why. If you consider what a Cray-1 does
> with floating point multiply and divide, you will find that IBM, even
> before the fix, wasn't all that bad.

The Cray-1 did not initially come with hardware divide, the divide was
done in software in the pipe. hardware divide was a $500K option which
was slower then the software divide ;)

Memory Parity was also a $500K option. To check for memory errors the
idea was the Cray was so fast you could just run your program twice and
if you got the same answer there was no memory problem.

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