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Since the original manufacturers (PCTEL/C-Media) no longer provide direct support, you must rely on archived repositories. Depending on your operating system, here are the most reliable sources: hsp56 sound card driver link
Many systems labeled “HSP56” integrated AC’97 sound. Try the driver: 🔗 https://www.realtek.com/en/component/zoo/category/ac-97-audio-codecs hsp56 sound card driver link
These are typically "Winmodems" that also handle audio functions. They were common in older laptops and budget desktops. HSP56 Sound Card Driver Links hsp56 sound card driver link
The Internet Archive has preserved several OEM recovery CDs containing HSP56 drivers.
drivers from The Retro Web often work for the audio portion.