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There's a 2804 used for NVRAM on my Sys 1 board. While trying to debug a hum through the audio and the music being much softer than the other sounds, I pulled it just because I could... both the music and the hum cut out, but the sound effects and speech still play. Checking the schematic, there doesn't appear to be anything sound related going through this line. Why would pulling the chip have this effect?
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