I just (re)installed SCO6 here from scratch because I am hunting a problem. So, I installed it, then got the SCO OpenServer Release 6.0.0 Maintenance Pack 4 Device Drivers Supplement .iso and installed the nd package.
# mount -F cdfs /dev/cd0 /cd-rom
# pkgadd -d /cd-rom
Then elect the nd package
According to http://ftp.sco.com/pub/openserver6/600/drivers/mp4drivers/README.osr600mp4_drivers.iso.txt, it is supposed to come with drivers for the intel pro gigabit cards. Well, when I checked which drivers it had available for me to select, it did not show any intel pro gigabit cards. In fact, the list of available nic drivers did not change from what came in the install CD. Did I miss a step?