Dusty ESS1869 ISA sound card with a built in FM radio daughterboard
After installing an NVMe SSD on my Pentium II 350..., I decided to add an ISA sound card (ESS1869) with an FM module.
If you haven’t worked with one of these before, you might wonder how you actually interface with the radio module. It turns out you need to track down the exact tuner software - it's not a part of the standard drivers. Next, the radio software expects the FM module to be accessed at the standard I/O port (0x30C), which can easily cause conflicts if that address is already taken or the card is manually configured (via jumper) to a different one. It’s a bit of a puzzle, but definitely doable...