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For most DOS software, this might be true.
I am referring to that "quote", because a few days ago, I upgraded my Schneider (Amstrad) PC 1512 to 640KB RAM. And yes, for this machine, it is enough to run most of the programs of an exciting decade.

But where does this "out to be enough" sentence come from ?

Most of the "googled" internet hits says Bill Gates said this.
At least there is one source of a similar sentence he said:
In Infoworld magazine from April 29th, 1985 (Vol.7 Issue 17), you can read at page 5:

When we set the upper limit of PC-DOS at 640K, we thought nobody would ever need that much memory.

William Gates, Chairman of Microsoft

You can read the whole article here (click on picture):


But some already further investigated some more possible sources, so it's difficult to say "Bill Gates" said this. Go on reading at http://quoteinvestigator.com/2011/09/08/640k-enough/

At least, this all is (interesting) history.

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