Photoshop 2.5 and 3.0 use the DSP if you have the device drivers installed. My IIfx has a Supermac Thunder/24 with DSP add-on and a Storm Technologies (also sold under other names)Nubus card and the control panel sees all of the DSP chips.
I think the 840AV uses an AT&T DSP 3210 , the Supermac branded Storm card uses the AT&T DSP 16A, Supermac GX card for the Thunder/24 (and others?) uses AT&T DSP 3210, Spectral Inovations MacDSP uses AT&T DSP32C, Digidesign Audiomedia II uses Motorola DSP 5600.
Don't recall if DECK II uses just built in DSP chips or ones on add-on cards.
Some of the very early quickdraw video accelerator add-on cards were just a Nubus card with 2 DSP chips on them (sometimes with RAM cache).
I think the 840AV uses an AT&T DSP 3210 , the Supermac branded Storm card uses the AT&T DSP 16A, Supermac GX card for the Thunder/24 (and others?) uses AT&T DSP 3210, Spectral Inovations MacDSP uses AT&T DSP32C, Digidesign Audiomedia II uses Motorola DSP 5600.
Don't recall if DECK II uses just built in DSP chips or ones on add-on cards.
Some of the very early quickdraw video accelerator add-on cards were just a Nubus card with 2 DSP chips on them (sometimes with RAM cache).