Apr il 1, 1981
If intermittent errors occur at theV8/370 console, and all alternate
consoles are unavailable (or not specified in theRIOGEN macro
instruction), issue theDISCONN command and log on again at some other
terainal.
If theVM/370 system console becomes inoperative to the point where you cannot log off, press the System/370 external INTERRUPT button to
disconnectyou from the failing system console (or alternate console if
that console is currently controlling the system.) This allowsyou to
log on and reconnect to a terminal with a communications line that has
already been enabled. This terminal can be another system console(Y8/370 supported device) or a reaote terminal attached to a 270x TCU. When the primary console is again operative, control can be regained from the alternate console by pressing the INTERRUPT button and
reconnecting using the primary console.When the device specified as the alternate console is a communication
line,Y8/370 enables the line. You can then establish a link with the
processor through a terminal connected to the line.Once the line is
established,Y8/370 proceeds with the normal system initiation. The
alternate console must not be a telecommunications line on a realIBM 370x Communications Controller. If the alternate console is an IB8 2741
Communication Terminal, it must use the EBCDIC transmission code.Nate: Y8/370 370x supports multiple alternate console selection only in 270x emulator mode. SELECTING A Y8/370 ALTERNATE CONSOLE DURING V8/370 INITIALIZATION
If theY8/370 system console is inoperative, a Vft/370 alternate system
console can startY8/370. To do this, place the primary V8/370 system
console in anot-ready status.
LoadV8/370 in the normal way (with the System/370 console switches
and theLOAD key). When the primary system console (assuming it was
generated as theV8/370 system console) indicates "not ready,n V8/370 rings the console alarm bell and enables the alternate system console
(such as a3210 Model 2, 1052 80del 7, or local 3270 if one is
specified) or one2701, 2702, or 2703 transmission control unit (TeU) line that has a leased line terminal attached, to allow system
operator to log on. TheTCU line address must be defined in the REALIO module during VM/310 system generation. If the real system consoles are
dedicated to virtual machine use only, the system can be generated with
a fictitiousV8/370 primary system console address and the same results
occur as the load operation with the not ready console described above.You can now establish a link with V8/370 by using the designated
device.Once CP identifies the terminal in the normal procedure, the
operator presses the BREAK, ATTN,RESET, or ENTER key, depending on the
terminal type. TheV8/370 system then performs automatic or manual
logon procedures, as previously discussed.Controlling the 370x Communications Controller Because the 3704 and 3705 Communications Controllers are programmable
devices, in order for them to be controlled byV8/370, they must be
loaded with an appropriate control program beforeV8/370 uses them for
system telecommunications. This loading is normally an automatic
function ofV8/370 system initialization, but it can be performed
manually.
Section 2. InitiatingV8/370 Operation 21
If intermittent errors occur at the
consoles are unavailable (or not specified in the
instruction), issue the
terainal.
If the
disconnect
that console is currently controlling the system.) This allows
log on and reconnect to a terminal with a communications line that has
already been enabled. This terminal can be another system console
reconnecting using the primary console.
line,
processor through a terminal connected to the line.
established,
alternate console must not be a telecommunications line on a real
Communication Terminal, it must use the EBCDIC transmission code.
If the
console can start
console in a
Load
and the
generated as the
(such as a
specified) or one
operator to log on. The
dedicated to virtual machine use only, the system can be generated with
a fictitious
occur as the load operation with the not ready console described above.
device.
operator presses the BREAK, ATTN,
terminal type. The
logon procedures, as previously discussed.
devices, in order for them to be controlled by
loaded with an appropriate control program before
system telecommunications. This loading is normally an automatic
function of
manually.
Section 2. Initiating