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When starting the Serial Port Enable utility on SCO OpenServer 5 for the SX card an error is generated [Port Enable Error 255] and the utility fails to start.
There are 2 main reasons for this either the TA/MTA/SXDC concentrators have not been detected or the SCO configuration files have been corrupted.
1. Check that the TA/MTA/SXDC concentrators and cards are loaded/detected on bootup. This information is listed in the hardware table on bootup or from the end the console message file /usr/adm/messages. The ports must be detected to be configured.
Note: The concentrator must be attached to the host card upon system startup.
If the modules are not detected run the DOS diagnostic and check the card and TA/MTA/SXDC modules are detected correctly. If the modules are not detected by the diagnostic utility then there is a hardware fault.
2. Check that /etc/inittab and /etc/ttytype are linked files. When you do an ls -ls listing of the files you should get something like this:
lrwxrwxrwx 1 root 39 Mar 24 13:39 ttytype -> /var/opt/K/SCO/Unix/5.04Eb/etc/ttytype
If either of the files is not linked then the following actions need to take:
a. Remove the SX driver.
b. Run "Software verify" on the operating system from custom.
c. Reboot the system.
d. Install V1.2.5 ( or above ) of the driver.