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Mnemonic
Operand
Word Times
BCO
BCl
FROM, TO
BIT CHANGE ZERO.
1
This is a special instruction for use with
eight-level Frieden data.
In going from Y
to Z, the data is rearranged from the eight-
level format used on a transmission line to
the six-bit alphanumeric format used in com-
puters.
The other two bits, the parity and
control bits, are put in the CBl and CB3
flip-flops.
FROM
I
x
x
x
x
x
x
x
x
x
c
D 6
Ds
P
D 4
D 3
Dz
D 1
I
x
y
TO
I
o
o
o
o
o
o
o
o
o
o
o
o
l
D 6
D 5
D 4
D 3
Dz
D 1
I
z
P goes to the parity flip-flop
C goes to the control bit flip-flop 1
FROM, TO
BIT CHANGE ONE.
FROM
I
x
x
x
x
x
x
x
x
x
TO
0
0
0
0
0
0
1
1
1
(CB3)
(CBl)
1
This is the reverse operation of BCO.
In
going from Y to Z, the data is rearranged
from the six-bit alphanumeric format into the
eight-level format used on a transmission line.
The control bit comes from BCl and the parity
bit comes from the output of the character
parity network.
x
x
xi
D6
Ds
D4
D3
Dz
D1I
y
c
D6
Ds
p
D4
D3
Dz
nij
0
z
p
is the output from the character parity network
C is the control bit 1 flip-flop
(CBl)
@&11&~~11c:J ~@------------
II-15
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