Ii!§! £onfigy!gtion: Real systea console = '8/370 system console
Real alternate system console = '8/370 alternate system console Real systea console = Batch virtual machine Real alternate system console = '8/370 system console Remote ter.inal = V8/370 alternate system console !hird Real systea console = V8/370 system console
Reaote terminal = V8/370 alternate system ccnsole
Real systea console = Batch virtual aachine
Tvo locally attached 3277 Display Stations = '8/370 system console
and alternate system console Enabled reaote terainal (not 3270) = '8/370 alternate systea
console (10 valid V8/370 priaary system console is designated in SYSGEI) !2te: The real system consoles must be turned off to prevent V8/370 froa using thea. ConfigY!stign: Systea console = '8/370 systea console (No V8/370 alternate console designated in SYSGEN) The first four configurations allov disabling of the V8/370 priaary console and selection of an alternate '8/370 console; or, conversely,
reselection of the '8/370 priaary console and disabling of the alternate
console.
Configurations five and six indicate that V8/370 specified no console substitution. Therefore, if the system console is inoperative at V8/370 startup, the
vait state and cannot continue. After the console
again, '8/370 aust be reloaded into the real systea. DISABLING THE '8/370 PRI8ARY COl SOLE system generation
designated '8/370 system enters the
becomes operative
If the '8/370 primary system console is inoperative, V8/370 aatoaatically selects the first alternate console (specified in the RIOGEN macro instruction) as the console for Frimary systea operation.
If the first alternate console specified is not operational, an atteapt viII be aade to start the next alternate console. If an operational
console is found, it viII be used as the V!/370 system operator's
console. 20 '8/370 Operator's Guide
Apr il 1, 1981
If intermittent errors occur at the V8/370 console, and all alternate
consoles are unavailable (or not specified in the RIOGEN macro
instruction), issue the DISCONN command and log on again at some other
terainal.
If the VM/370 system console becomes inoperative to the point where you cannot log off, press the System/370 external INTERRUPT button to
disconnect you from the failing system console (or alternate console if
that console is currently controlling the system.) This allows you 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 real IBM 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 the Y8/370 system console is inoperative, a Vft/370 alternate system
console can start Y8/370. To do this, place the primary V8/370 system
console in a not-ready status.
Load V8/370 in the normal way (with the System/370 console switches
and the LOAD key). When the primary system console (assuming it was
generated as the V8/370 system console) indicates "not ready,n V8/370 rings the console alarm bell and enables the alternate system console
(such as a 3210 Model 2, 1052 80del 7, or local 3270 if one is
specified) or one 2701, 2702, or 2703 transmission control unit (TeU) line that has a leased line terminal attached, to allow system
operator to log on. The TCU 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 fictitious V8/370 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. The V8/370 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 by V8/370, they must be
loaded with an appropriate control program before V8/370 uses them for
system telecommunications. This loading is normally an automatic
function of V8/370 system initialization, but it can be performed
manually.
Section 2. Initiating V8/370 Operation 21
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