IBM 7090 - Page 75

SR (l-35).AD
AO(D6)
On
AD (Q-35)-+-AC
A5 (Dl)
2.13.31.1
Comp AC(9-35)
-AD A8(D3)
2.13.31.1
Comp AC(9-35)
~AD AO (06)
2.13.27.1
COMPLEMENT ADDITION
1. 9 Carry, Add 1 to Units Position, Change the Sign of
Acc (SR was > than Acc).
2. No 9 Carry, Re-complernent and Leave the Sign.
(SR was <: than Acc)
No
AC ~-35) < Sk~-3S)
Off
Turn on FP
Tgr A6(01)
Turn on Col
9 Corry Tgr
2.10.37.1
On (MQ ,0)
SR --+ AD
A8(D3)
AC-.SR
Al0 (Dl)
AD (9-35)-AC
Al0 (Dl)
(MQ-+SR)
(Interchange SR and AC
for Double precision
accuracy)
To 4th Step L Time (Fig 5. 3-23D)
FIGURE S.3-23C. FAD +0300
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