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27C128AD eprom difference/datasheet

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I have an old toshiba eprom that I must copy. But for some reason the read binary file contains two identical characters in a row. And obviously the burned eprom won't work.

So I was wondering if there's something different with 27C128AD compared to 27C128 eprom. The 27C128AD is made by Toshiba, and I haven't been able to find any datasheets on it, or for 27C256AD. Does anybody know what AD stands for? Or where i could find a pinout for it.

The original eprom works, but I need to get the backup working too.

Any help would be greatly apreciated!
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