Comparing Files in DOS?

EINREB

Member
In the old days, way back when we used DOS as an OS, I can remember that I had a utility that would compare files byte by byte, and print out the differences between the two files.
Is there something like that in Windows? I like to get something like that to show the progressive versions I have developed on programs when I am using the Arduino or PICAXE chips. I am not interested in the propriety software, just the ones I wrote myself.
 
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