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Xerox 550 User Manual

Xerox 550
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loaded
into
register
R.
Although the Q address
field
permits
any
of
32 addresses
to
be
specifi
ed,
only
the
following may
be used:
Q Address
X'lD'
X'lE'
Contents
{
(Bits
0-13)
- Reserved
(Bits 14-31) - "Branch from" Program
Counter
{
(Bits
0-7)
- Reserved
(Bits
8-31)
- Load
Device
Address
All
other
Q addresses from
X'OO'
-
X'lF'
are
reserved.
Affected:
(R)
EW-R
READ
DIRECT,
INTERRUPT
CONTROL
(MODE
1)
The following
configuration
of
RD
is used to control
the
sensing
of
the
various
states
of
the
individual
interrupt
levels
within
the
basic
processor
interrupt
system:
Bits 28 through
3·1
of
the
effective
address
specify
the
iden-
tification
number
of
the group
of
interrupt
levels to be
con-
trolled
by
the
READ
DIRECT
instruction.
Thp R fiplrJ
of
thp
RD
instruction
specifies
a
general
register
that
will
contain
the
bits sensed from
the
individual
inter-
rupt levels within a
specified
group. For
external
interrupt
groups,
bit
position
16
of
register
R
contains
the
appropriate
indi
cator
bit
for
the
highest priority (lowest number)
inter-
rupt level within
the
group and
bit
position
31
of
register
R
contains
the
indi
cator
bit
for
the
lowest priority
interrupt
level
within
the
group. For assignments in
Group
X'O',
see
Table
11. Each
interrupt
level in
the
designated
group is
sensed
according
to
the
function
code
specified
by bits
21
through 23
of
the
effective
address
of
RD.
The codes
and
their
associated
functions
are
as
follows:
Code
Function
001 Read Armed
or
Waiting
State.
Set
to
1
the
bits in
the
selected
register
which correspond to
interrupt
levels
in
this group
that
are
in
either
the
armed
or
the
waiting
state.
Reset
all
other
bits to
zero.
010
100
Read
Waiting
or
Active
State.
Set
to
1
the
bits
in
the
selected
register
which correspond to
each
interrupt
level
in
this
group
that
is
in
either
the
waiting
or
the
active
state.
Reset
all
other
bits
to
zero.
Read Enabled.
Set
to
1
the
bits
in
the
selected
register
which correspond to
each
interrupt
level
in this group which
is
enabled.
Reset
all
other
bits
to
zero.
READ
DIRECT
(MODE
9)
READ
CONFIGURATION
CONTROL PANEL
The mode 9 instruction reads
the
state
of
the
Configuration
Control
Panel for
the
addressed
cluster
or
unit.
Physi cal
addresses are assigned
at
the
time
of
system
configuration.
The
returned
status
to
Register R is shown in Tables
11
and 12.
Table
11.
Read
Direct
Mode 9 Status Word
RD
Status Word
Bit
No.
Basic Processor
Cluster
Memory Unit 1
00
System
Select
System
Select
01
Clock
Select
Clock
Select
02
Processor
CI
uster Address
22
Unit
No.
22
03
Processor
Cluster
Address
21
Unit
No.
21
04
Processor
Cluster
Address 2
0
Unit
No.
2
0
05
BP
Enable
Port Enab
I e 1
06
MIOP Enable
Port Enab
Ie 2
07
DIO
Enable Port Enable 3
Control Instructions 105

Table of Contents

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Xerox 550 Specifications

General IconGeneral
BrandXerox
Model550
CategoryPrinter
LanguageEnglish

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