You can transfer specific files from the spooled printer or card
punch of a virtual machine to the card reader of the saae or another
virtual machine. (I virtual card reader is not li.ited to records.) Files are not physically printed or punched when transferred
between virtual unit record devices by the spooling routines. With this
method, you can make files available to multiple virtual machines, or to
different operating syste.s executing at different times in the saae
virtual machine.
The Remote Spooling Communicatioris subsystem,· with the CP spooling
system, provides support for spooling across a teleprocessing network.
For detailed information about RSCS, see the !!L370 Guide. V!/370 spooling includes many options for the virtual machine user
and the real machine operator. These include aultiple copies
of a single spool file, backspacing any nuaber of printer pages, and
defining or reordering spooling classes for real output Real, printers with the Universal Character Set feature must have the
block data check set when using V!/370 spooling. The LOIDBUF comaand automatically sets the block data check. For more details on spooling,
see "Spooling Considerations."
The terminal user can spool virtual console output and virtual
input keyed in by him in addition to typing or displaying it
terminal. Furthermore, if the virtual console is disconnected
virtual machine is active, the console spool file acquires all
output that would normally print or display at the terminal.
console I/O consists of all initiated CP commands and responses,
as the communication to and from the operating system running
virtual machine. You start virtual console spooling when you issue the command: SPOOL CORSOLE START console
at the
and the
console
virtual
as well
in the You close the console spool file at logoff time or when you stop and
close the file. When you close the console spool file, it goes on the
printer spool file and then the operator can manipulate it in the same way as any other printer spool· file.
The display output of local or remote 3270s in DISPLAY mode (every 16
lines) is written automatically on the spool file if the operator is the system operator and the device was specified as a graphic device
supported as a virtual machine operator's console.
Console spooling for the system operator continues even if the
operator disconnects fro. one terainal and logs onto another. To stop
the automatic console spooling, the operator must issue the SPOOL CONSOLE STOP comaand. If the system fails, up to 16 lines of output may be lost from the system operator's spool file, but the system closes the
console spool file when the failure occurs. However, virtual machine operators may lose up to one page of spooling data in a system failure
because their spooling buffer is one page (4096 bytes) in size.
In regard to DISD I/O, errors occurring on sFool and paging devices
produce error messages that appear on the system operator's ter.inal. Section 5. operator Spooling Functions 211

1 user can start or stop virtual console spooling any ti.e during a
ter.inal session with the SPOOL CORSOLE com.and. For a description of
the CP SPOOL and CLOSE co •• ands, see the £R !B! Use£!. Rote: The user cannot use console spooling to stack co •• ands for subsequent execution. The console spool file is for historical purposes
only.
If a permanent I/O error occurs during a real I/C operation, you restart
the spooled files as follows: • Printer files--from the beginning of the current page (the last skip
to channel 1). • Punch files--from the beginning of the spool file. • Beader files--fro. the beginning of the real deck (the operator .ust normally place the card deck back in the reader). • Console files--do not restart.
the console file. The virtual
console spooling. CP ends console spooling and purges
.achine continues without further
Bote: If an I/O error repunches only the error
nor.al punch spool files.
occurs while punching accounting cards, CP card and not the whole file as in the case of SPOOL BUFFERS The buffers used in virtual .achines while collecting and writing spool
data are each olie page ('1096 bytes) long, and contain both the data to be transcribed and all CCls necessary for operating the unit record
devices that perfor. the transcription. Syste. failures that end syste.
operation can cause virtual .achine operators to lose up to one page of
spooling data.
Buffers used for the te.porary storage of spool data on its way between auxiliary storage and the user's virtual .achine are allocated
fro. a pool of virtual pages that belong to CP. Direct access devices
provide the auxiliary storage necessary for CP spool buffering. CP uses unit record devices to spool input and output operations. However, certain features or functions that pertain to this group of
.achines are not supported. Consult the V8/370 restrictions listed in
the Y!L370 ana the list of devices suitable for spooling devices (both unit record and direct access) listed in "Appendix B: System Require.ents." llso see the !!L370 PlgBniBg gnd §y!g!. 212 '8/370 Operator's Guide