View source for WR550400/WR550402 pinout

          .---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'' [https://forums.nesdev.org/viewtopic.php?t=17478], along with pirate VRC4 chip. Original game used Jaleco SS88006 along with D7756C ADPCM Speech Chip [http://bootgod.dyndns.org:7777/profile.php?id=3980]
* 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.
 
 [[Category:Audio]]
 [[Category:Pinouts]]