WR550400/WR550402 pinout

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         .---v---.
   D7 -> |01   18| <- D0
   D1 -> |02   17| ------------[R=750k]-+
   D6 -> |03   16| -> MAIN CLK----------+
   D2 -> |04   15| -- GND
   D5 -> |05   14| -> SONG3 PLAYED
   D3 -> |06   13| -> SONG3 FINISHED STROBE
   D4 -> |07   12| -> DATA
  +5V -  |08   11| -> CLK1 (for audio data ?)
AUDIO <- |09   10| -> CLK2 (for meta data?)
         `-------`
     WR550400/WR550402

Notes:

  • Those 2 chips were used in bootleg version of Moe Pro! Saikyou-hen Baseball [1], along with pirate VRC4 chip. Original game used Jaleco SS88006 along with D7756C ADPCM Speech Chip [2]
  • Each of those 2 chips contains different set of 8 audio samples, used in game.
  • Vendor logo printed on ICs suggest that the manufacturer was Winbond,
  • Forcing rising edge on one of its D0..D7 inputs enables playback adequate audio sample
  • The output "analog" audio has 32-voltage-levels,
  • Along with the analog audio, there is some digital data transmitted on pins 12/11/10
  • Pin 14 is high for the whole time when D2 audio sample is played,
  • Pin 13 goes high for the last 0.5ms when D2 audio sample is played.