Easy to use hex editor?

[Ehud Karni]

On Thu, 07 May 2015 09:16:20 +0300, geoffrey mendelson wrote:
>
> I have a DOS program I need to modify. I need to be able to load an DOS
> EXE file, and hopefully using a gui, search for ascii text and 8 byte
> floating point numbers in INTEL format and modify them. Then when I
> write the file it still needs to be be executable.
>
> If it has a patch mode, where I can compare the patched version to the
> original and get a diff type output, I would really be happy.

You can use `hexl-mode' in Emacs.
To hex-edit a file use the `hexl-find-file' Emacs command.

To compare the 2 files use `cmp' or `diff' on the output of `od -t x1 <file>`.

Ehud.


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