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Bill Gates

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640K ought to be enough for anybody.
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Often attributed to Gates in 1981. Gates considered the IBM PC's 640kB program memory a significant breakthrough over 8-bit systems that were typically limited to 64kB, but he has denied making this remark. Also see the 1989 and 1993 remarks above.

 
Bill Gates

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I laid out memory so the bottom 640K was general purpose RAM and the upper 384 I reserved for video and ROM, and things like that. That is why they talk about the 640K limit. It is actually a limit, not of the software, in any way, shape, or form, it is the limit of the microprocessor. That thing generates addresses, 20-bits addresses, that only can address a megabyte of memory. And, therefore, all the applications are tied to that limit. It was ten times what we had before. But to my surprise, we ran out of that address base for applications within—oh five or six years people were complaining.

 
Bill Gates
 

I have to say that in 1981, making those decisions, I felt like I was providing enough freedom for 10 years. That is, a move from 64k to 640k felt like something that would last a great deal of time. Well, it didn't - it took about only 6 years before people started to see that as a real problem.

 
Bill Gates
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