This is for the modem/soundcard that came with a bunch of Packard Bells. One chip says Crystal CS4231A-KL and another says Rockwell RCV144ACF-P and another says Aztech AZT2316R. FCC is I38 or 138, then MMSN841. The sticker on the back says AZSC53428581. It worked for me with Win98.
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