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
Page of GC20-1806-9 As Updated April 1, 1981 by TNL GN25-0834 To load a 370x program into the 370x (either manually or
automatically), the 370x program must previously have been saved on one
of system volumes. Specifications in the VM/370 configuration module, DMKRIO, describe whether the load process is
automatic or manual. For more information on saving or loading a 370x control program, see the VM/370 Planning System Generation If manual loading is necessary or desirable for a 370x control
program, you shQuld use the NETWORK LOAD command as follows: NETWORK LOAD raddr ncpname
where raddr specifies the physical device address of the 370x, and
ncpname is the name of a 370x control program image.
If the specified 370x Communications Controller does not require
loading (that is, it already has an active control program loaded), the
following message appears on your console:
DMKNLD461R CTLR raddr IPL NOT REQUIRED; ENTER 'YES' TO CONTINUE: You should verify that yon specified the correct 370x, and reply "YES" only if the load is to be attempted. (Note that execution of the NETWORK LOAD command causes the 370x to be reset, thus discontinuing any
current teleprocessing activity.) Other messages relating to the operation of the 370x can appear on
your console. These messages are described in the System Messages. For more information about the facilities of the NETWORK command, ref er to the "NETWORK Dump Operations", "CP Commands", and "NCPDUMP" sections in this book. CONSIDERATIONS FOR LOADING ALL 370X CONTROL PROGRAMS When using the NETWORK LOAD command to load an EP for the 370x, the
following events occur: Active users are disconnected I Active I/O operations are reset Dedicated devices are detached and released Dialed lines are released Devices enabled but not dedicated are reset Binary synchronous communication are reset
22 VM/370 Operator's Guide
Previous Page Next Page