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Appendix B
Model 35601A
A1 Board: U18, U19
-hp- part number 1820-1470
mfr. part number SN74LS157N
INPUTS OUTPUT
INPUTS OUTPUT
VCC STROBE 4A
4B
4Y
3A
J^RUinjiiMjiriiwii
n
G
S
1A
4A
IB
4B
1Y
4Y
2A
3A
2B
3B
3Y
2Y
LLfUJiiJiiJUJiiJUJiir
SELECT 1A
IB
1Y
v
2A
2B
g
2Y
GN
INPUTS
OUTPUT
INPUTS OUTPUT
STROBE
H
L
L
L
L
INPUT
SELECT
X
L
L
H
1
H
A
X
L
H
X
X
B
X
X
X
L
H
OUTPUT Y
L
L
H
L
H
A1 Board: U20
-hp- part number 1820-1419
mfr. part number SN74LS85N
DATA INPUTS
A2
A1
81
AO
JlHJ¥U71finflilRlRUTl_
I I I
I I I
A1
81
AO
T l
niiijjiiniJUJiiJUJiir
O P T A <
« < . A . . « > . „ A > . A . , A < .
/
«.
, N P U T
CASCADE INPUTS
OUTPUTS
A3.B3
A 3 > B 3
A 3 < B 3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
A3 = B3
COMPARING INPUTS
A2.B2
X
X
A 2 > B 2
A 2 < B 2
A2 = B2
A2 = B2
A2 = B2
|A2 = B2
A2 = B2
| A 2 = B 2
A1.B1
X
X .
X
X
A 1 > B 1
A K B 1
A 1 = B 1
A 1 = B 1
A 1 = B 1
I A1 =B1
AO.BO
X
X
X
X
X
X
AO>BO
AO<BO
AO = BO
| A O = B O
CASCADING INPUTS
I
A>B
X
X
X
X
X
X
X
X
.
X
I
H
A<B
X
X
X
X
X
X
X
X
X
I
H
A=B
X
X
X
X
X
X
X
X
H
I
L
A>B
H
L
H
L
H
L
H
L
L
I
L
OUTPUTS
A<B
L
H
L
H
L
H
L
H
L
I
L
A=B
H
I
L
B-2
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