I've uploaded four shots of the two different adapter boards
from the Italian Star Castle boards that I have. The schematic
up there is for the one which has DAC800's on it. I should
probably trace out the other one, since it looks quite a bit
simpler (it uses the National analog switch instead of the
more common 4016 which needed lower supply voltages. They
are on the schematics section on www.spies.com.