What was the single byte change to port WordStar from CP/M to DOS?

Posted by amarillion on Stack Overflow See other posts from Stack Overflow or by amarillion
Published on 2009-03-10T20:32:35Z Indexed on 2010/06/12 10:03 UTC
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I was re-reading Joel's Strategy Letter II: Chicken and Egg problems and came across this fun quote:

In fact, WordStar was ported to DOS by changing one single byte in the code. (Real Programmers can tell you what that byte was, I've long since forgotten).

I couldn't find any other references to this with a quick Google search. Is this true or just a figure of speech? In the interest of my quest to become a "Real Programmer", what was the single byte change?

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