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NOTE 1: 9'5 Complement Circuitry:
INPUT
g's COMPLEMENT
Digit
1
2
4
8
1
2
4
8
0
H
H
H
H
H
L
L
H
1
L
H
H
H
L
L
L
H
2
H
L
H
H
H
H
H
L
3
L
L
H
H
L
H
H
L
4
H
H
L
H
H
L
H
L
5
L
H
L
H
L
L
H
L
6
H
L
L
H
H
H
L
L
7
L
L
L
H
L
H
L
L
8
H
H
H
L
H
L
L
L
g
L
H
H
L
L
L
L
L
NOTE 2: On A211C15, input at pin 12 is hard wired low, and
output pins g, 10, and 11 are not used IN/C).
NOTE 3: BCD Low true logic, switch contact(s) to Ground is true
state.
CODE
Digit
1
2 4
8
0
0 0
0 0
1
1 0
0
0
2
0
1 0 0
3
1
1 0
0
4
0 0
1 0
5
1 0
1 0
6
0
1
1
0
7
1 1 1
0
8
0 0 0
1
g
1 0 0
1
,eo
INPUT
~'?;.'
..._".
IC7 Jumpered for BCD 7
IC6 Jumpered for BCD 5
3320B OPTION 001,75.11 Impedance
The Complement /D/ input controls the BCD output ID1, D2, D4,
D8!. With the Complement /D/ input high I'" +5 V) the direct BCD
sum of inputs #1 and #2 are applied to the BCD Output. With the
Complement /D/ input low ('" - 5 V) the g's complement of the two
inputs is applied to the BCD Output. The BCD Output lines have
internal pull-up res;stors.
eo,
,,,P-"T'<Q.,
IPRESET>
IC7 Jumpered for BCD 7
IC6 Jumpered for BCD 3
NOTE 4: 1C4, 5, 6, or 7 operate as a BCD Adder. The two BCD
Inputs 1#1 and
#2)
are summed together and applied to the BCD
Output. The BCD inputs and output lines are high true logic. A true
signal on the A Sign input indicates a negative amplitude number
O.e., -10.00 dBm). The BCD Input #2 is a "hard wired" input,
preset by means of jumper wires on the pc assembly. See Note 5.
3320B STANDARD, 50.11 Impedance
Transistor 01 inhibits a Carry-In signal to IC4 when the Amplitude
Sign is positive. Transistors
Q2,
Q3 and IC8 control the level of the
Complement /D/ input.
NOTE 5: Jumpers on the A21 Assembly for IC6 and IC7 are preset
at the factory:
,,'o-[r,,---+++--+'-'IL../
INPUT
DECIMAL OUTPUT
12
13
14
15
1
2
3
4
5
6
7
9
10
11
L
L
L
L
L
H
H
H
H
H
H
H
H
H
L
L
L
H
H
L
H
H
H
H
H
H
H
H
L
L
H
L
H
H
L
H
H
H
H
H
H
H
L
L
H
H
H
H
H
L
H
H
H
H
H
H
L
H
L
L
H
H
H
H
L
H
H
H
H
H
L
H
L
H
H
H
H
H
H
L
H
H
H
H
L
H
H
L
H
H
H
H
H
H
L
H
H
H
L
H
H
H
H
H
H
H
H
H
H
L
H
H
H
L
L
L
H
H
H
H
H
H
H
H
L
H
H
L
L
H
H
H
H
H
H
H
H
H
H
L
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
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