What IC is this? what does it do?

I know this is a tech-tools list, but I'm hoping someone here can identify a chip for me.
   
  18 pin,
   
  NMOS8342-A
  MS2620F-15
   
  The "6" in the second line could be a "G" I guess, but I really think it's a 6. But it could be MS2G20F-15.
   
  I'm guessing the 8342 is the year and week code, but I can't find anything on 2620 (or 2G20). I'm guessing some type of RAM, but that's totally a guess.
   
  Also, in rotated text, to the left and perpendicular to the text above, in capital block letters is AEZ. It sure appears this is a manufacturers symbol or abbreviation, but I can't find anything on that either.
   
  Anyone have any ideas or clues? Thanks,
  
Joe
  joemagiera@ameritech.net
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Received on Thu Jan 4 10:20:22 2007