What about these chips.. my old soundblaster 16 has these… are these useless for the mididbox FM?
What’s the board number of your SoundBlaster 16? (Upper left corner of the compoent side when the edge connector is at the bottom, starts with CT.) From the looks of the of the datasheet i found on http://www.datasheetarchive.com/, the YMF289B is compatible with the YMF262, but has a different clock and pinout (and the ability to read from the data registers). It was designed for 3.3V operation,but does run at 5V. So it should work, but you’d need to redo the board layout. The YAC516 is the corresponding DAC for the YMF289B.
found an website who sales old soundcards http://www.m-ware.de