SYSTEM ITse the SYSTEM command to simulate the action of the RESET and RESTART buttons on the real computer console, and to clear storaqe. The format
of the SYSTEM command is:
r----------- L SYStem I , I {
CLEAR } RESTART I I I J CLEAR virtual storage and virtual storage keys to binary zerDS. RESET clears all pendinq interrupts and conditions in the virtual
machine. RESTARr simulates the hardware system RESTART function by storing the
current PSi at virtual location eiqht and loading, as the new PSi, the douhleword from virtual location zero. Interrupt coniitions and storage remain unaffected. 1. The function and the CLEAR function leave the virtual machine
in disabled wait state. Both CLEAR and RESET clear pending
interrupts. Both functions load a PSi that is all zeroes except
for the wait bit which is set on.
2. After issuinq the SYSTEM command with RESET or CLEAR specified,
either STORE a PSi and issue BEGIN or issue BEGIN with a storage location specified, to resume operation. The virtual machine automatically restarts at the location specified in
the new PSi (which is loaded from the doubleword at location zero)
after the SYSTEM RESTART command is processed. STORAGE CLEARED - SYSTEM BESET is the response given if the command SYSrEM CLEAR is entered. SYSTEM RESET is the response qiven if the command SYSTEM RESET is entered.
If the c3mmand SYSTEM RESTART is entered, no response is given; the
virtual machine resumes execution at the address in the virtual PSi loaded frDm virtual storage location zero. Section 5. Format of CP Commands 153

TAG Use the rAG to associate file information with a VM/370 file. The format of the TAG command is:
r----- DEV TAq PUnch DEv CONsole [tagtext]
vaddr
FIle spoolid [tagtext 1
rrinter} PUnch DEv CONsole OUery vaddr
FIle spoolid PClt CONSOLE vaddr with t.he queried.
a spoolinq device whose output is to be associated
taq information or whose tag information is to be
Note: when a qeneric device name, such as PRINTER or CONSOLE in the TAG command, all current virtual devices of
that type are affected.
FILE spoolid
t aqtext
specifies a previously closed spool file whose tag information
is to be replaced or aueried. This form of the TAG command
can only be used for reader spool files that are queued on virtual reader.
The spoolid operand is the spool file identification, a number 1 and 9900 and assigned by CP when the spool file was
closed.
is the information (up to 134 characters in length, including imbedded that is to be associated with the specified
spool device or spool file. The contents and format of this data is cOIDPletely flexible and is the responsibility of the
file originator and the end user.
certain control and addressing information, meaningful to the RSCS component of VM/370, can be specified in this field. For details on how to use the taqtext operand when transmitting
files across the RSCS network, refer to the following "Usage Not e s " sect ion. 154 IBM VM/370 CP Command Feference for General Users