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