I know this is ancient, but I'm trying to rebuild a crashed server for someone before we move them to a virtualized SCO install with a Digi portserver for serial ports. ANyway, this is so 5.0.7. I found teh Digi knowledgebase article on how to install classic board on SCO (this is the PCI version). I run mkdev serial, select Digi Classicboard 8 (unit 1). It goes through the kernel relink and completes fine. Reboot, and I get "no such device..." errors if I try to enable one of the ports. The device names exist in /dev, but I'm not sure that they have actually been created as devices. I also don't know if SCO sees the board - should the board show up in hwconfig -h list?