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Few days ago, I got a problem with the 6.20 version of C51 keil Software, like you can see on http://www.keil.com/forum/msgpage.asp?MsgID=3260 . Keil support found what's append and send me a mail with a new version of OH51 (v 2.6) that correct the error due to the long NAME statement that I am using. And, thanks Andrew to help me to find my problem.
Similarly, It's very difficult to find the difference between, say, C51 v6.20b and v6.20c In fact, you can't even find the differences between v6.20 and v6.14; I've done a side-by-side file compare on the release notes, and the only difference is that all the occurrences of "6.14" have been changed to "6.20!"