Easy to use hex editor?

[geoffrey mendelson]

Hi,

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.

I had a great one on my MAC, but I no longer have the MAC and would 
prefer to do it on a Linux system.

TIA for any suggestions.

Geoff.

-- 
Geoffrey S. Mendelson 4X1GM/N3OWJ
Jerusalem Israel.