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Don't know if this helps BUT: The chip is a CS4248 Crystal Semiconductor. Same as Analog Devices AD1848 rev K which was replaced by the pin compatible AD1845 . Info on both is on Analog's WEB page. Crystal lists the CS4231A as being the replacement for the CS4248. This might give you a few options in Setup. I'm trying to make the soundcard do Full duplex which means replacing the chip with a pin compatible one. And finding Drivers (grin). ..peter.. ---------- From: Keith Moore[SMTP:moore@cs.utk.edu] Sent: Tuesday, June 17, 1997 3:32 PM To: thinkpad@cs.utk.edu Subject: tp750 audio with linux/*bsd has anyone figured out how to get the thinkpad 750's audio chip to work with either Linux or *bsd?