I am confident that if someone wrote plugins, you could use the DSP for more than just some Photoshop functions. Perhaps to decode an MP3, or encode video taken with a capture card. The possibilities are limitless until you realize that information to accomplish this is long gone.

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Welllll....

The datasheet for the AT&T DSPs can probably still be obtained. So writing code for them can be done. The tricky part would be figuring out how the Mac transfers data to the card and receives the results. However, disassembly of the existing plug-ins might shed light on that subject. You know pretty specifically what the card does. It shouldn't be too horribly difficult to reverse engineer at least some of how the card gets data off of the NuBus.