Appendix
C.
Comparison of VM
JPC
and
VMjSP
Relationship
of
VMjPC
and
VMjSP
VM/PC
is
based
on
VM/SP
Release
2.
VM/PC
has
changed some aspects of
VM/SP
Release 2 to fit its
environment.
Externally, some of the commands and command options
available
on
VM/PC
are not the same as those available
on
a
VM/SP
Release 2 system. In addition, some
of
the
command response formats may be different from a
VM/SP
Release 2 system. Some
VM/SP
Release 2 commands and
options are not present in
VM/PC,
since
VM/PC
does not
have support for tape
I/O,
virtual readers, or virtual
punches.
In
addition, the
CMS/DOS
environment
is
not
supported
on
VM/PC.
Internally, the control blocks of CMS are identical in format
with those of
VM/SP
Release 2 CMS.
If
we examine a typical CMS session, some of the differences
between
VM/PC
and
VM/SP
Release 2 can be pointed out
and explained.
• Logon screen
You
don't
have to clear the system logo in order to log
on
to
VM/PC.
In
addition, you may specify an
environment to start
or
you may have a default
environment, specified in your system configuration file.
CP
Commands
CP commands
that
are allowed to have multiple
operands in
VM/SP
(for example, DISPLAY) will be
allowed only one operand
by
VM/PC
CP.
Appendix C. Comparison
of
VM/PC
and
VM/SP
C-l
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