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Famicom/NES dumps / MiWi2 (VT168) Dumping Attempt
« on: March 13, 2018, 01:22:19 PM »
On a whim, I tried importing the MiWi Arcade Games ROM into Audacity as unsigned 8-bit audio to see if I could find any recognizable tunes, since that's worked for other Famiclone consoles with sampled audio. It looks like the audio clips are encoded at ~4200 Hz, and I can clearly recognize one of the menu themes (the one from the 16-in-1 menu screen with the electric piano arpeggios) at 0x56000, but it's very fuzzy and garbled.
Is there some kind of bitwise manipulation going on with the music as well? Several of the audio clips are surrounded by long strings of 0xEA bytes, which seems suspicious in that respect, but if so, I'm not sure what the correct transformation is. (Or am I possibly using the wrong codec entirely, despite unsigned 8-bit PCM producing an identifiable melody?)
Edit: Probably some kind of DPCM codec, most likely. Interpreting the audio as a Famicom DMC sample at ~34KHz, the melody is at the right pitch and even more clearly identifiable, but it's still scratchy.
Is there some kind of bitwise manipulation going on with the music as well? Several of the audio clips are surrounded by long strings of 0xEA bytes, which seems suspicious in that respect, but if so, I'm not sure what the correct transformation is. (Or am I possibly using the wrong codec entirely, despite unsigned 8-bit PCM producing an identifiable melody?)
Edit: Probably some kind of DPCM codec, most likely. Interpreting the audio as a Famicom DMC sample at ~34KHz, the melody is at the right pitch and even more clearly identifiable, but it's still scratchy.