If
CC4
:::
0,
the
MIOP is in a normal mode of operation and
the
meaning of
the
condition
code
during a
no
is:
2 3 4 Meaning
o 0 0 0
I/O
address
recognized,
acceptable
SIO
is
currently possible,
and
status information in
general registers is
correct.
o 0 0
Not
possible.
o 0
Not
possible.
o
o
0
I/O
address recognized but
acceptable
SIO
is not currently possible because
device
con-
troller or
device
is busy. Status information
in general registers is
correct.
o 1 1 0
Not
possible.
o 0 0 Not possible.
o 1 0 Pari ty error
detected
on returned status
and/
or condition
code.
The result of the
no
is
indeterminate.
1 1 0 0
I/O
address not
recognized,
no
not
ac-
cepted,
and status information returned
to
general registers is incorrect.
1 1 1 0 Incoming parity error
detected
by processor
and no aborted.
No
status information
re-
turned to general registers.
If
CC4
:::
1,
the
MIOP is in the test mode and the meaning
of
the
condition
code
during a
no
is:
2 3 4 Meaning
000
o o
o
0
o 1
o
TOV
Unit
is
performing
an
Order
Out
operation.
Unit is performing
an
Order
In
operation.
Unit is performing a Data
Out
operation.
Pari ty error
detected
by Processor Interface
on returned status
and/or
condition
code.
The result of
the
no
is
indeterminate.
Unit is performing a Data
In
operation.
BCF
detected
while
unit performing a Data
In
operation.
TEST
DEVICE
(Word index alignment, privileged)
120
Input/Output
Instructions
TEST
DEVICE
is used to provide information
about
a
de-
vice
other than
that
obtained
by means of the
no
in-
struction.
The
operation of the
selected
lOP,
device
controller,
and
device
is not
affected,
and
no
opera-
tions
are
initiated
or terminated. The responses to
TDV
provide the program with information giving
details
on
the
condition of
the
selected
device,
the
number of bytes
remaining to be transmitted in the current
operation,
and
the
present point
at
which the
lOP
is
operating in the
command list.
If
the
R field of
the
TDV
instruction
is
0,
the
condition
code
is set, but no general registers
are
affected.
If
the
R field of
TDV
is
an
odd
value,
the condition
code
is set and
the
device
status and byte count
are
loaded into
register R as follows:
If
the
value
of
the
R field of
TDY
is an
even
value
and
not
0,
the condition
code
is set, register
Rul
is
loaded as
shown
above,
and register R is loaded as follows:
Refer to
the
applicable
peripheral reference manual for
de-
scription of Deyice Status Byte. Refer to Tables
16
and 17
for functions of other bits within status words.
Affected:
(R),
(Rul), CC
If
CC4 =
0,
the MIOP is in a normal mode of operation and
thp
mpnninn
nf
th",
rnn,.Hti,...n
rl'V'l",
...4
..
rinn
n Tnv
ie:
•
•••
-
•••
_-
•••••
;;;1
-'
•••
-
-_.,-
••
'-"
----
-_.
"'>:}
- • -
••
~.
2 3 4 Meaning
o 0 0 0
I/O
address recognized, no
device-dependent
condition
present, and status information in
general registers is
correct.
o 0 1 0
Not
possible.
o 0 1 1
Not
possible.
o 1 0 0
I/O
address recognized and
device-dependent
condition is present or
device
controller is
in
test mode.
o 1 1 0
Not
possible.
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