IBM 3274 Planning, Setup, And Customizing Manual page 72

12. During 1M L, errors may occur because of improper customizing. The
8421 indicator codes caused by these errors are shown in Figure 4-7.
If, after IML js initiated, the X {(,:' symbol appears with
,no
communication
reminders in the 3278 or 3279 display stations's operator information
area for more than 1 minute, contact your host system operator to
ensure that the 3274 Control Unit is belng·polled.
13. It is suggested that you copy the configuration information from this
form on the Configuration Data card supplied with the 3274 Control
Unit. Store the card in the pocket on the inside of the 3274 operator
access door for future reference.
14. If a Subsystem Verification Procedure has been given to you,
perform that procedure.
Chapter 4. Initial Custo';nizing Procedure 4-7