...as I know the VS890 is a 24 Bit System (8 Channel Version of the VS1880), so it should use a
VS8F-2 Roland Effectboad (the VS880 for Example only can Use the VS8F-1 Board).
The VS1680/1880/2000/2400/2480 are using VS8F-2 Boards too, so there should be no problem.
Installing or changing the Board is very easy, just some screws and al little click by your fingers
You can install 2 Boards on the VS1680 so you have 4 Stereo to 8 Mono Effect Channels...
With a Firmware Update (Midi Dump) for the 1680 you can use the VS8F-3 Boards too, that can be filled up with 2 optional Software Plugins (e.g. Antares, Urei and so on...)......I prefered 2 of the VS8F-2 Boards...
EDIT:
Please check on the Roland Site (or on your VS890) if there is installed an extra Board, some VS Versions came out with integrated Effects, so I don´t know if there only came with the Board installed, or if there is installed something fix on the Mainboard...