Please give more information, for starters.
How is the printer attached to the network? Does it have it's own internal network adapter, or is it attached to an external device; (i.e. HP JetDirect, NetGear, Shared on PC, other UNIX system, etc.)
What flavor of SCO? Is it OpenServer or Unixware? Version?
Do you have any existing network printers already configured and working properly?
You can search this forum for previous solutions. Your's might be similar to previous issues.
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