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I-'
"%j
I
.....
~
' B
tv
WORD
BIT
WORD
TYPE
CONTROL
A SOURCE FIELD
REPLACEMENT BITS FOR THE M1 REGISTER
TYPE
~
-....]
"
~
O'\
I
~
~
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
1
OC= BITOOR 4
BIT 5 = 0 MEANS STRAIGHT
O= LS
BITS 9--14 CONTAIN THE REPLACEMENT VALUES
o=
°'
.
01=BIT1 OR 5
A-REG GATING.
1=Ext
FOR BITS 1--6 OF THE M1-REGISTER
TEST
tlJ
10 =BIT 2 OR 6
BIT 5 = 1 MEANS CROSS
FOR
11
11=BIT3 OR 7
A-REG OUTPUT.
0
OJ
~
.................................................................................................................................................
-----------
(')
::J"
0
::s
WHEN THIS CONTROL WORD IS
1=
READ INTO THE CONTROL REGIS-
TEST
TER, BIT 5 IS FORCED TO 1. THIS
FOR
()
RESTRICTS THE FACILITIES THAT
1
0
::s
OJ
CAN BE ADDRESSED BY THE A-
SOURCE FIELD TO THOSE THAT
.....
rt
HAVE AT LEAST BIT 5
=
1 IN THEIR
.....
0
::s
A-SOURCE DECODES .
BECAUSE BIT 5 IS FORCED IN THE
8
CONTROL REGISTER, THE TRUE
STATUS OF BIT 5 IS TAKEN FROM
OJ
(I)
THE STORAGE DATA BUS OUT, FOR
-
A-REG GATING.
~
0
11
0..
EITHER DECODE
LOCAL
IN CONTROL
STORAGE
1-3
STORAGE
REGISTER
"<
tO
(1)
OOOOOR 0100
GO
0001 OR 0101
G1
°'
0010 OR 0110
DO
0
11
00110R0111
D1
10000R 1100
PO
....i
-
1001 OR 1101
P1
1010 OR 1110
HO
1011OR1111
H1
EXTERNAL FACILITIES HAVE
THE SAME ADDRESSING RESTRIC-
TIONS.
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