Who invented DOS?

[Kevin Handy]

Tom Jennings wrote:

>
> So if you disassembled 8080 binary, mechanically translated the
> resulting source to 8086, that would preserve the easter egg.
> (Man would that be one ugly program.)
>
> It seems entirely likely that Kildall's hack (algorithmically
> obscured text within the code somewhere) would only be preserved
> by some sort of mechanical translation. It's doubtful an honest
> re-write even with listings side by side would result in it being
> preserved.
>
> There are few enough CP/M binaries that the sources of which could
> contain such things. CCP did not become COMMAND.COM, that is
> clear, it's totally different.
>
I've always heard that it was in PIP, using some lame type of
encoding (an xor?).