Those two cards are time base correctors for video tape
machines to play
into the Toaster. 
        My A3000's an ex-Toaster machine...you can tell by the hacked
rear panel at the video slot.  It no longer has the Toaster installed
though.  It does have a GVP TBCplus installed...kind of cool in that
instead of the multiple BNC/RCA/DIN connectors crammed onto the end
of the expansion card it has a single DB-25 connector that a
10-headed cable plugs up to.  Makes it a lot easier to switch
connectors as well.  I don't think it was quite as good a card as the
DPS units but it supposedly could be used to convert signals between
NTSC and PAL on the fly as well as crude video capture.
        Jeff
--
                           Home of the TRS-80 Model 2000 FAQ File
                                         
http://www.cchaven.com
                     http://www.geocities.com/siliconvalley/lakes/6757