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Grand Products 1986

rom board       +--------------+
                                  amiga I/O board
u4  u3  u2  u1
        u6  u5      Amiga 500      7404 7400
                                   74374 6116  8255  TIP120 TIP120
u12 u11 u10 u9                         battery       TIP120 TIP120 TIP120 TIP120
        u14 u13                                      TIP120 TIP120 TIP120 TIP120



                +---------------+



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