IBM 7090 - Page 35

3SA
29A
24A
19A
14A
8A
3A
34V
28V
23V 18V
13V
7V
2V
33V
27V
+
22V
+
17V
+
12V
+
6V
+
IV
+
+
A
A
11V
A
A
32V
A
26V
21V
A
16V
SV
A
PV
10V
31V
2SV
20V
ISV
9V
4V
QV
30V
34A
28A
13A
3311
27V
~
~
~
+
+
IV
+
+
JJ.L
+
32V
A
A
SV
A
PV
A
A
10V
3111
25V
~
.iY....-
QV
30V
33A
22A
17A
12A
32V
21V
+
11V
+
A
16V
10V
A
31V
20V
ISV
9V
30V
Co(14-9)
2.02.42.1
34V
19V
14V
8V
3V
Co(3-Q)
29V
23V
13V
7V
2V
2.02.40.1
+
+
12V
+
+
+
+
22V
A
6V
A
I V
A
A
IIV
A
A
21V
16V
10V
SV
PV
26V
20V
9V
LA(14-9)
4V
LA(8-4) Q V
LA(3-Q)
2SV
LA 29-2S
2.02.42.1
2.02.40.1
2.02.4S.1
2.02.46.1
A = 2 Bits (AND V = At Least I Bit (OR Co = Carry Out
LAC) LAC)
LA
= Look Ahead
FIGURE
3.1-10. FIRST STAGE LOOK AHEAD CIRCUITS