Conexant’s legacy HSP56 modems often used the same driver as the or HCF series. 🔗 Driver example (Archive.org mirror): https://archive.org/details/conexant-hsp56-mr-modem-driver
If your HSP56 came from an HP Pavilion (e.g., 6730, 8750c) or Compaq Presario, the driver is hidden in old “Conexant Audio” packages. hsp56 sound card driver link
Let me know your and hardware ID (from Device Manager → Properties → Details → Hardware Ids) if you need a more precise link. Conexant’s legacy HSP56 modems often used the same
Before downloading a driver, you must identify which specific hardware you have. "HSP56" is not enough information. 8750c) or Compaq Presario
A Comprehensive Guide to the HSP56 Sound Card Driver: Installation, Troubleshooting, and More