>Long time ago I though of doing a YM2151 FM synth chip card Wow, you just jogged my memory about another project I wanted to do as a PC add-on card. I recovered an Ensoniq "Q" chip from an Apple IIgs motherboard that I picked up a repair shop salvage in the late 80s. The Q chip is the main sound device from the Ensoniq ESQ-1 synthesizer and I think it was also used in the Ensoniq Mirage DSK-8 sampling keyboard. The Q chip was a very powerful sound chip for the time and was designed by the same guy who did the SID chip in the Commodore 64. I struggled to get a datasheet for the Q chip to build a sound card/synth on a PC card project so I held onto the Q chip. I still have it and data is now available for it. That might make an interesting project, but I would probably just use a microcontroller or rPI to avoid having to write convoluted drivers in X86 assembly. Maybe I'll look at that idea again since I still have the chip. I already have some Ensoniq synthesizers (SD-1 and SQ-80) so maybe it's not really worth it but it could be fun and frustrating to try.