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RCA Spectra 70 - Page 118

RCA Spectra 70
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Notes
(Cont'd)
Privileged
Instructions
a. The device control electronics and the device specified
are
available.
b.
The
Start
Device instruction specifies a Sense command to a
device
that
is inoperable.
5.
Condition Code 1 indicates
that
either
the channel
status
byte
or
the standard device byte has been stored in the channel registers in
scratch-pad memory
for
the specified channel.
The channel
status
byte is stored under
the
following conditions:
a. A
parity
error
occurs while accessing
the
Channel Address Word
(CAW), Channel Block Address (CBA),
or
a Channel Command
Word (CCW). The channel control check bit in the channel
status
byte is set.
b.
The Memory Protect feature is not installed and the key in
the
CAW is not zero. The program check
bit
in the channel
status
byte is set.
c.
The main memory address specified in
the
CAW
or
CBA is not
on a double word boundary. The
program
check
bit
in the channel
status
byte is set.
d.
The main memory address in the
CCW
specifies
an
address out-
side the available memory
for
the system. The
program
check
bit
in the channel
status
byte is set.
The
standard
device byte is stored under
the
following conditions:
a. The specified device control electronics on the multiplexor chan-
nel indicates
that
a device request
interrupt
pending condition is
present. The external device request
interrupt
pending
bit
in
the
standard
device byte is set.
b.
The
Start
Device instruction specifies a command which is
other
than
a Sense command and
the
addressed device is inoperable.
The device inoperable
bit
in the
standard
device byte is set.
c.
The specified device is busy
but
the
device control electronics is
not busy (Le., tape rewinding, off-line seek to a random access
device end
bit
in
the
standard
device byte
are
set.
6.
Condition Code 2 is set under the following conditions:
a. A selector channel is specified
that
is busy.
b.
A selector channel is specified
that
has
an
interrupt
pending
(termination
or
external device request).
c.
The multiplexor channel is specified and
it
is operating
in
burst
mode.
d.
The multiplexor channel is specified and the addressed device
control electronics is busy with addressed
or
non-addressed device.
e.
The mUltiplexor channel is specified and
the
addressed device con-
trol electronics has a termination
interrupt
pending.
f. A
burst
mode operation is directed to
the
multiplexor and there
is a termination
interrupt
pending on one of the attached device
control electronics.
7.
Condition Code 3 is
set
under
the
following conditions:
a. A selector channel is specified
that
is not
in
the system.
b.
The specified device control electronics is inoperable.
109

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