BBraun has identified traces connection the CoPro to the NuBus 30 Bridge, these connections are not present on any other PDS card. For them it's just a flat out second "PDS" extension for use by the MoBo Proc.

bbraun has posed a question about the CoPro being an integral part of the NuChip 30 implementation on the IIsi adapter. I responded by saying it might give access to the CoPro from the NuBus, which would be present, but but not apparent on NuChip 30 based MoBos.

Dunno, interesting questions! [] ]'>