And is it possible to still use the PIV scandoubler under CGX?
There are a couple of CyberGraphX settings which affect the passthrough/scan doubler that is built into boards like the PIV. The monitor icon, found in Devs:Monitors, has a PASSTHROUGH tooltype that must be set to "YES", which is the default. Then there is the environment variable NOPASSTHROUGH, found in envarc:CyberGraphX, this must be set to 0 (this is the negative choice, notice the change of sense as it can be confusing) for the passthrough/scandoubler to work. If you set both of those and then reboot then the scandoubler should be used!
More details on CyberGraphX setup can be found on:
VGRThe page of interest is CGX Files under INFO & ABOUT on the left side, there is also a specific Picasso IV page linked further down.
HTH
Robert