Work of scaner mostly depends on it's type - SCSI/LPT/USB/..., because TWAIN-interface is supported. Also you can find information about scanners and OS/2 here.
eComStation 2.0 is ready for ACPI computers. The operating system was modified (during 3 years) to support new PC computers (various drivers were updated, the parameters of the system were changed) eCS 2.0 what's new