IBM 7090 - Page 76

I
From Addition, signs alike
Turn Off
Col 9 Carry Tr
AO(Dl)
2.10.37.1
Comp AC(9-35)
AD AO(D3)
2.13.22.1
4?
(Effectively Complemented the MQ ,.----...!....----,
and Added 1 to the Units Position) AD(9-35)-AC
A2(Dl)
2.13.31.1
SR (1-35) __ AD
A4(D3)
2.13.21.1
L Time
4th
Step
2.10.33.1
l-AD(35)
AO(D3)
2.13.27.1
Off
(Interchange SR and Acc)
AC(1-35)
--SR
A6(Dl)
AD(Q-35)
-AC
A6(Dl)
2.13.01.1
2.13.31.1
(MQ Now Complemented +1 in SR,
Set Sr to MQ to Complete Double
Precision)
SR(1-35) _
MQ
.A8(DI)
2.13.41.1
Turn off FP
Tgr Al0(D!)
2.10.29.1
I
From Addition, signs unlike
OBJECTIVES:
1. Zero Test Acc Frac (Do Not Normalize All Zeros)
2. Complete Double Preci sion if Necessary
No
Adder
Col 9
Carrl
Yes
AC (
9-35) = 0)
,
Turn on 9 Col
Carry Tgr
t
2.10.37.1
"--
On
T2 Tgr
Off (MQ = 0, Do Not
Nor
malize All Zeros)
AD(Q-35) -AC
A8 (D3) (Reset Ac)
2.13.31.1
AC(9)
=1 (AC Frac is Normalized)
= 0 (Normalize)
To End Operation (Fig 5. 3-23E)
To 5th Step L Time (Fi g 5.3- 23E)
FIGURE
5.3-23D. FAD +0300
75