IBM 7090 - Page 74

•
f
FP Shift
Sh Ac (9-34)
Rt
Rt Every Clock
Time
2.13.42.1
t
2.12.33.1
t
Unlike
Alike (True Addition)
L
Time
2nd Step
2.10.31.1
I
OBJECTIVES:
1. Alignment of Fractions
(Must have
Common Denominator)
~;>-yes __
1':.
Sh MQ(I-34)
Rt Every Clock
Time
2.12.43.1
L Time I
3rd Step
MQ
9-35 = 0
No
Ac (35) ~MQT9)
Every Clock Time
2.13.42.1
OBJECTIVES:
Step SC Every
Clock Time
2.13.71.1
1. Test for Possible Double Precision Handling
2. Add (Signs Alike, or Signs Unlike)
2.12.47.1
Yes
Turn Off T2
Tgr A2 (Dl)
2.10.31.1
~
~
SR(I-35)~AD
AO (D6)
AC(9-35) ~AD
AO (D6)
~>-O_f_f ______________ ~
~
2.13.21.1
,
2.13.24.1
AD(Q-35) .... AC
A5(Dl)
2.13.31.1
+
FP Shift
Rt A6 (Dl)
2.13.42.1
+
,
•
Sh AC(9-34)
Rt A6 (Dl)
2.12.33.1
T
Allow
Carry AD(9)-
AD (8) AO(D6)
2.10.46.1
t
To Complement Addition (Fig 5.3-23C)
To 4th Step (Fig 5. 3-23D)
FIGURE 5.3-23B. FAD +0300
73
(Acc Overflow is
Possible)