M5205

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Created by OKI Data, this is a speech synthesis chip used in several video games, notably the TurboGrafx CD / TurboDuo.

         +---+--+---+
      S1 |1  +--+ 18| Vdd
      S2 |2       17| /XT
4B / /3B |3       16| XT
      D0 |4       15| RESET
      D1 |5 M5205 14| /VCK
      D2 |6       13| T2
      D3 |7       12| T1
      NC |8       11| NC
     Vss |9       10| DAout
         +----------+

Link to the datasheet in PDF