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
000
o 0
o 0
o
o
o
I/O
address recognized,
acceptable
SIO
is
currently possible, and status information in
general
registers
is
correct.
o For
RMP,
I/O
address recognized,
acceptable
SIO
is
currently possible; however, status
information in the general registers may be
incorrect. For
MIOP, not possible.
o
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 For
RMP,
I/O
address recognized but
accept-
able
SIO
is
not currently possible because
device
controller or
device
is
busy; status
information in general registers may be
in-
correct. For MIOP, not possible.
o Processor Interface
detected
parity error on
returned status
and/or
condition
code.
The
result of
the
no
is
indeterminate.
o 0
I/O
address not recognized,
no
not
ac-
cepted,
and status information returned
to
general registers
is
incorrect .
o
.....
1_
T
Ir.
_...1...1
__________
:
__
...1
__
...I
TTr.
_L...
__
~_.J
.'v
1./
'-'
\,oiu
......
C;~
•
C,"",~III~vU
.....
I.U
....
'""
....
..,va
."""'"
because
an
error
detected
when the
lOP
at-
tempted
to
read and transfer the
no
param-
eters
(device/device
controller address and
R field information)
from
the
BP
to the
lOP
via
main memory. Status information returned to
general registers
is
incorrect.
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 0
o 0
o
o
Unit
is
performing
an
Order
Out
operation.
Unit
is
performing
an
Order
In
operation.
Unit
is
performing a Data
Out
operation.
Parity 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 operati on.
TDV
TEST
DEVICE
(Word index alignment, privileged)
TEST
DEVICE
is
used to provide information about a
device
other than
that
obtainable
by
means of
the
no
instruction.
The operation of
the
selected
lOP,
device
controller, and
device
is
not
affected,
and no operations
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
TDV
is an
even
value
and
not
0,
the
condition
code
is set, register
Ru1
is
loaded as
shown
above,
and register R
is
loaded as follows:
D_C
__
~_
~L...
__
~_I:
__
L...I~
~""r:_L...""r_1
r""&",,ro
...
_o
....
,..
.....
,..1
&,..r
""''''
'v
"'"
"'"t't""""'"~'"
t"'"
't""""~'
''',
....
""
... "
..
,-,,--,
''''
description of Device Status Byte. Refer
to
Tables
16
and 17
for functions of other bits within status words.
Affected:
(R),
(Ru
1), CC
If
CC4 =
0,
the
MIOP is in a normal mode of operation and
the
meaning of
the
condition
code
during a
TDV
is:
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
o
o
o
For
RMP,
I/O
address recognized
and
no
device-dependent
condition present; however,
status information in general registers may be
incorrect. For
MIOP, not possible.
o 0
I/O
address recognized and
device-dependent
condition
is
present or
device
controller
is
in
test mode.
o For
RMP,
I/o
address recognized,
device-
dependent condition
is
present, or
device
con-
troller is in test mode; but status information
in
the
general registers may be incorrect. For
MIOP, not possible.
Input/Output
Instructions 137
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