MV1A

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Mute Board[edit]

On MV4FS YM2610

  1. Datalines D0-D7 busy and healty on 4slot
  2. RAD0-RAD7 healthy static about 113kHz signals
  3. OP0 Clearly shows activity on sound
  4. SH1 and SH2 steady 55.56kHz signals

Mute MV1A

  1. rad0 18.66Khz signal
  2. rad1-3 0.25V 113khz triangle waveform
  3. rad4-6 18.66kHz signal
  • A1 from Z80 looks ok
  • A0 from Z80 looks ok
  • /RD and /CS always high, not normal - signals traced to custom SNK Custom "NEO-D0 9535 B24"
  • /RD PIN 59 on YM2610 traces to pin 48
  • /WR PIN 58 on YM2610 traces to pin 47
  • /CS PIN 57 on YM2610 traces to pin 49
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