Hello, this was the info that was on Anchor Electronics web page when they were selling the card-
Message from Anchor Electronics at purchase...
SSM VB-1Video Interface $11.95
Found a handful of these 1976 collector’s items. These were likely rejects originally – some areas have been marked with tape. Sorry, no data is available from us…
Upon receipt, the board had a film like clear over spray on some parts of the board but no defects that I could see...even the taped area looked okay. After cleaning the board lightly with metal polish and then alcohol, the board looked very good and was populated with components.
Once the right parts were installed, the board seems to display text and block characters but I have not spent time to write code to access the page memory on the card and test it fully...there may still be problems.
The character generator ROM was purchased from a parts surplus site but can still be purchased from Ebay for about $18.00-$19.00 (not chinese sites!).
>>> Charles