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MNEMONIC
BCl
FROM
fxxxxxxxxxlc
D6 D5 p D4 D3 Dz D1I
xf
y
TO
I
0 0 0 0 0 0 0 0 0 0 0 0
I
D6 D5 D4 D3 Dz D1I
z
P goes to the PARITY FLIP-FLOP
(CB3)
C goes to the CONTROL BIT FLIP-FLOP #1
(CBl)
OPERAND
WORD TIMES
DESCRIPTION
FROM, TO
1
FROM
BIT CHANGE ONE.
This is the reverse
operation of BCO. In going from Y to Z, the
data is rearranged from the six-bit alpha-
numeric format into the eight-level Teletype
format used on a transmission line.
The
control bit comes from CB 1 and the parity
bit comes from the character parity output
of the parity network.
y
TO
f
o o o o o o
1
I
1 1
jc
n
6
n
5
P D4
n
3 Dz
nil
o
I
z
P is the output from the character Parity Network
C is the Control Bit #1 Flip-Flop
(CBl)
BRANCH INSTRUCTIONS
The states of the Plus, Zero, and Even Flip-Flops are not changed by any branch instruction.
BRU
M
BRS
M
1
3
BRANCH UNCONDITIONALLY.
Control is
transferred to the instruction in M.
BRANCH TO SUBROUTINE. The location of
the instruction following the BRS is stored
in M; then, control is transferred to the
location specified by the contents of M+ 1.
M must be even.
The remaining branch instructions are conditional branches. Control is transferred to M if the
appropriate conditional test is satisfied, otherwise, control goes to the next instruction, i.e., the
instruction following the branch instruction.
BZE
M
BNZ
M
BPL
M
BMI
M
1
1
1
1
BRANCH ON ZERO.
If
the ZFF is zero,
control is transferred to M.
BRANCH ON NON-ZERO.
If
the ZFF is
non-zero, control is transferred to M.
BRANCH ON PLUS.
If
the Plus Flip-Flop
is plus, control is transferred to M.
BRANCH ON MINUS.
If
the Plus Flip-Flop
is minus, control is transferred to M.
[ID/A\1!/A\~~11~ ~@------------
-77-
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