The storage key bits in the PSW, 8-11, (for LPSW and
interrupt
PSW swaps) will
be
maintained although no storage
protection
is
performed.
Test
I/O
- TIO
The TIO instruction may
be
used
to
clear pending
I/O
interrupts. However, since most
of
the
I/O
operations are
performed synchronously (without
I/O
interrupts) via the
Diagnose Interface, most
of
the time this instruction
is
executed it will return condition code 0
(I/O
device
available)
or
3
(I/O
device not available).
The only virtual machine
I/O
interrupts
that
are presented
are for asynchronous terminal attentions
and
completion
interrupts for Diagnose 58.
Set Clock - SCK
The
TOD
Clock
is
managed by the
PC
DOS and
is
always
secure. As a result the SCK instruction always returns
condition code
1.
A-2
VM/PC
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