I just picked up an Amiga Video Toaster (just the CPU
unit).  Inside on the
left are the video toaster cards, but the two right-most slots have
full length
cards made by Digital Processing Systems Inc.  The cards are daisy
chained to a connector on the motherboard.  Each card has four BNC
connectors, a 5-pin DIN, an RJ-11 jack and a three-position switch on the
rear slot panel.  The back side of each card is covered with a full-length
aluminum shield.  The only identifying numbers I've found, besides the
FCC ID, is "743-770", then "PT2 REV-3, Made in Canada". 
        Good score.  The boards sound like the TBC IV or TBC IV Plus.
The BNC's should be:
        video in, video out, timing in, timing out.
        The RJ-11 should be the serial connection and the 5-pin DIN
should be the S-video in.  You could supposedly have up to four of
these boards daisychained together.
        Of course, I could be wrong <g>  That's what it sounds like though.
        Jeff
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