Visara Master Console Center Installation - Manual (Page 45)

Chapter 5 Connectivity Interfaces
Installation Preparation Guide 45
Missing Interrupt Handler (MIH) Problem with MVS
All MCC installations monitoring MVS systems should create or update
their SYS1.PARMLIB (or the equivalent PDS) member IECIOSxx, where
xx is a 2-byte EBCDIC field (numbers and/or letters). If this update is not
made, Missing Interrupt Handler (MIH) errors will be generated. The
update should contain at least one "card image" that (starting with the
letters MIH in column 1) looks like this:
MIH TIME=00:00,DEV=(xxx)
Or
MIH TIME=00:00,DEV=(xxx,yyy,zzz,etc.)
Replace the lower case letters by the device address or addresses of the
MCC printer port, for example:
MIH TIME=00:00,DEV=(711)
Or
MIH TIME=00:00,DEV=(711,715,72F)
This change stops MVS from presenting a "pseudo device end" for the
MCC printer port, which takes it out of service. When the MCC presents
the "real device end", it is once again ready to receive printer port bound
data.
To have this change take place immediately, enter the following on an
MVS (Master or Master authority) Console:
T IOS=xx
To have the settings in place for EVERY IPL, ensure the IEASYSxx
member of SYS1.PARMLIB contains a card image that looks like this:
IOS=xx
where xx represents the two EBCDIC characters appended to the name of
the IECIOSxx member.
It is also possible to add the MCC consoles into the list, but only after
MVS has presented a "missing device end" message for a MCC Console.
This happens rarely compared to a printer, since the printer is usually an
output only device. Consequently, it is assumed a printer has "real” paper
in it, and will take some time to dump the data in the device buffer onto
the printer's paper.