6.
The application program must also establish
an
environment to handle
I/O
interruptions and must
ensure
that
channel
end
and device
end
have
been
received before processing continues.
7.
If
the test request key
is
depressed when in full screen
mode,
X'604040'
is
returned
to
the application program
in the read buffer.
8.
If
you press the
PAl
key in full screen mode,
CP
posts
an
attention interrupt to your virtual machine.
If
the
virtual machine does
not
respond with a
READ
and you
press the
PAl
key a second time, your virtual machine
is
put
in
CP
mode and
"CP
READ"
is
displayed in the
screen's status area. However, if you set bit
X'lO'
of
the
CONTROL
option
on
before the initial
ERASE/WRITE
and press the
PAl
key, the interrupt
is
reflected
to
your virtual machine for handling.
If
you
have not set bit
X'lO'
of
the
CONTROL
option
on
and
you press the
PAl
key, your virtual machine is
put
in
CP
mode and
"CP
READ"
is
displayed in the screen's status
area.
A-26
VM/PC
Users Guide
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