(3) OptiJn ECMODE allows the virtual machine to use the complete set of virtlal System/370 control reqisters and the dynamic address
translation feature of theSystem/370. (4) The address of the virtual machine console is 01F, and your system corresponds with the terminal as if it were a .... ,... .. I:" I"")"' ... n ..)":;I:J,..)":;IV. (5) The virtual unit record devices (reader, punch, and printert are to
be and their addresses, as far as the virtual machine is
concerned, areOOC, OOD, and OOE, respectively.
(6) In this configuration, a50 cylinder read/write minidisk with a
virtlal address of130 is located on cylinders 50 through 99 of a
real2314 volume labeled VSDISK1. Similarly, a 20 cylinder read/write minidisk with a virtual address of 151 is located on
cylinders 1 through20 of a real 3330 volume labeled VDISK2. The
last entry provides a to a sharaole eMS system volume so the
user can use suchCMS functions as the CMS editor or the EXEC processor. The LINK entry makes the virtual disk at virtual
address440 available to your virtual machine in read-only mode at virtual address 190. NQi§§: 1. The cead password entry (RR) on
withthe proper password can
read-only mode.
theLINK command means that anyone
share the use of the minidisk in
2. The access mode (WR) on the LINK command means that you can write to the disk as long as no one else has a link to it; if someJne else links to it before you log on, you still have read-only access.
3. detailed information on directory "Directory Control Statements" in the entries, see the section Some ievices such as unit record devices (readers, printers, and
punches)are usually defined as being spoolei; in this way, a few real
unit record devices can support a larqe number of virtual unit record
devices.Other devices such as magnetic tapes require a one-to-one virtual to
real This means that for its period of use, the device
must bededicated to one virtual machine. For this reason, these devices are not permanently assigned; (that is, they are not defined in
theuser's VM/370 directory entry). They are temporarily attached to a
user'svictual machine as needed. VIRTUAL DISKS ITnder VM/370, a single real direct access storage device (DASD) can be
manaqejas if it were made up of a number of virtual disks (minidisks). Virtual disks, to VM/370, are extents on real DASD. To the virtual
machine, they functional equivalents of real disks. They can range
from 1 cylinder to all of the cylinders available on a real volume. Virtual disks can be permanently or temporarily defined for your virtual
mach ine.
section 3. CP CommandUsage 15
translation feature of the
be
concerned, are
(6) In this configuration, a
virtlal address of
real
cylinders 1 through
last entry provides a
user can use such
address
with
read-only mode.
the
share the use of the minidisk in
2. The
3.
punches)
unit record devices can support a larqe number of virtual unit record
devices.
real
must be
the
user's
manaqej
machine, they
from 1 cylinder to all of the cylinders available on a real
mach ine.
section 3. CP Command