The boards for these have an SD..... Is there a still avail website or a way to update these to different or more games other than the handful that are on them ??
Not really... there are 2 or 3 images that will work on that board, depending if you have the original board or the later release.
The original board will support the Taito 10-in-1, Taito 20-in-1, and the SNK 6-in-1. The later release will only support the Taito 10-in-1 and SNK 6-in-1, due to a bug in their software.