IBM 7090 - Page 32

Step Pulse
Trig A SCI7
r--n
Trig B SCI7
Trig A SCI6
---,
Trig B SCI6
~
Trig B SCI5
SC Value
7
FIGURE
3.1-8A.
+A
(Tg
r
B)
4B
+A
-N SC Set Gate
4C
+P AS 16 to SCI6
+A
(Tgr A)
40
-N Stp SCI7
+A
(Tgr B)
4F
+A
4G
+P ASI7 to SCI7
+N Ste~ SCI7
+A
(Tg, A)
4H
r--n
r--
I
:---
I
4
SHIFT COUNTER
+0
3B
+0
3C
+0
3D
+0
3F
+0
3G
+0
3H
:---n
Position 16
Output
CAP
68uu
2D
Position 17
Output
CAP
6Suu
2H
FIGURE 3.I-SB. SHIFT COUNTER POSITIONS 16 AND 17
Step Pulse
Trigger A PCI7
Trigger 8 PCI7
Trigger A PCI6
Trigger B PCI6
Trigger A PCI5
0
Trigger B PCI5
Value
(Tgr 8)
+P Set PCI6
(Tgr A)
+P Stp PCI7
(Tgr B)
+P Set PCI7
-N Minus to Stp
PCI7
(Tgr A)
I--
I
;----;
.--
I
I
r----
I
I
I 2 5
FIGURE 3. 1-9A. STEPPING OF THE PROGRAM COUNTER
+A
4D
+A
4E
+A
4G
+A
4H
+A
41
+0
3C
+0
3D
+0
3E
+0
3G
+0
H
+0
31
Position 16
Output
CAP
68 uu
2E
Position 17
CAP
68uu
21
FIGURE 3.1-98. PROGRAM COUNTER POSITIONS 16 AND 17