This simply allows you to input and output
SVideo signals into your Video Toaster. It
should have 4 inputs corresponding to the
Toaster's 4 inputs and 2 Y/C outputs. You
can still run your input through the TBC
before going into this card. There should
also be some jumpers onboard for configuring
wether you want the inputs to accept a
composite or Y/C signal, outputs are always
Y/C encoded.
You can find out more at this site under
"non-rtg video cards":
http://www.amiga-hardware.com/The ToasterLink card was made to allow
controlling a VideoToaster enabled Amiga
from a Mac AFAIK. I assume you need some
kind of software on the Amiga and Mac sides
to make this possible.