DEFINING THE OPERATOR'S CONSOLE During DOS/VS system generation, an address is specified for the oFerator's ccnsole= The user's terminal must also be at this address. Usually, DOS/VS expects the operator's console to be at real address 01F. The device has to be generated as a 3215, 3210, or 1052 console.
However, when using DOS/VS in a virtual machine, any terminal type can
be used as the virtual operator's console.
To find out the virtual machine's terminal address, enter this
command:
query console
If the resFcnse indicates that the terminal is not at 01F but at another
address, such as 009 (which is a standard console address),
enter this command:
define 009 as 01f This command allows the terminal to now function as the operator's
console for both DOS/VS and CMS. Preparing Jobs for a DOS/VS Virtual Machine
There are several ways to prepare a job stream for a DOS/VS virtual
machine: • Prepare a deck of punched cards that contains such information as DOS/VS job control statements and input files. Place a CP ID
statement at the beginning of this deck to indicate the userid of the DOS/VS virtual machine; for example:
ID DOSVUSER Then put the cards in the real system card reader. Based on the
use rid specified on the ID card, VM/370 directs the spool file to the
virtual card reader of the DOS/VS virtual machine, which in this case
is being run on the userid DOSVUSER. • Use CMS to create a disk file containing card images identical to the
cards submitted in a real card reader for DOS/VS. Use the CP SFCCL command to spool the virtual card punch to the card reader of the DOS/VS virtual machine and use the CMS PUNCH command to punch the
card images. In the CMS environment, issue:
spool punch to dosvuser
punch dosjob jcl (noheader Use the NOHEADER option of the PUNCH command to suppress punching a CMS READ control card at the beginning of the card deck.
A job stream spooled to DOS/VS by either of these methods remains in
the card reader of the DOS/VS virtual machine until the user causes DOS/VS to begin reading the job stream from its card reader. Spooling the card file can be done before or after initializing DOS/iS or a t any time while the system is active.
section 3. DOS/VS in a Virtual Machine 85

Before using the virtual punch to punch jobs to a virtual machine,
take the Frecaution of clearing any files or card images that may remain
iD it from Frevious jobs. The following commands ensure that the virtual Funch does Det have any other punch files in it:
spool punch nocont
close punch purge
A user should also issue these commands to purge any eXisting reader
files of the virtual machine that run DOS/VS: spool reader nocont
close reader
purge reader Of ccurse, do not purge any needed files
ottain data about existing reader files
the command:
that may be in the To
before they are purged, enter query reader all !2te: If any files are open, this command does not tell the user that
they are open.
Loading DOS/VS This topic describes one method for loading DOS/VS in a virtual machine.
It shows how to enter the commands and control statements to IPt DOS/VS and how to ready DOS/VS for input jobs. Following the description of
the method is an example of how to 1PL DOS/VS from the virtual card
reader. IPL FROM THE CONSOLE When a user is sure that he has all the virtual unit record devices he
Deeds, that the console is properly defined, and that all required DASD devices are attached, he should enter this command to make extended
centrol (EC) mode active for the virtual machine because DOS/VS needs EC mode to page:
set ecmode on
Hcwever, if this option is specified in the virtual machine's directory
entry, the user does not have to specify it. To load DOS/VS into the virtual machine, enter the 1Ft command:
ipl 250 After a few seconds, the system enters a wait state. Cn a real system
consele, the wait light goes on. On the terminal, a user may want to let
a few seconds pass to be sure that the wait state has been entered. To
verify that the system is in a wait state, enter CP mode and use the DISPLAY command to display the PSW: display psw If bit 14 is a 1, the system is in a wait state.
BEGIN command to resume program execution.
86 IBM VM/370 Operating Systems in a Virtual Machine If not, use the