IBM 7090 User Manual

Sum in
AC
Com
in S
~
I Time
Pri Op 32
1
E Time
SB ---+SR
E7(Dl)
2.12.50.1
AC(Q-35) .... AD
E9(D3)
2.12.24.1
+
+
SR(S-35) -+AD
(P-35) E9(D3)
2.12.15.1
j
+
AD(P-35) +AC
AC(P-35) ----..SR
SR(S-35) -+ SR
Ell(Dl)
2.12.30.1
~
+
(S-35) Ell (Dl)
(S-35)Ell(Dl)
2.12.02.1
2.12.11.1
+
+
1
L Time
Comp AC(Q-35) Comp of Sum
+ AD LO(D3) for Subtraction
2.12.22.1
AD(P-35) -+AC
L2(Dl)
2.12.30.1
SR(S-35)-+AD
(P-35) L4(D3)
2.12.15.1
+
OR
in
SR
p of Sum
AC(P-35) -+SR
AD(P-35)+AC
OR in AC
R
(S-35)
L6(Dl)
L6(Dl)
2.12.02.1
2.12.30. i
+
+
1
SR(S-35)~AD
(P-35) 14(D3)
Sh AC(P-35) Lt 2 (OR) in AC
L8(Dl)
2.12.34.1
End Op
I
Time
AC(Q-35)+AD'I Carry -+ AD
14 (D3) I (35) 14(D3)
~ 2. 12~t..... 1_5_. 1 ____ 2 ._1_ 2~f-24_._1 ____ 2 ._11L,·_29_._1 _----:
2(OR) - (Comp of Sum) + 1
AD(P-35)+AC
16(Dl)
/ 2.12.30.1
Note: Clear Acc(Q)
Exclusive OR
Set Acc
(S) Plus
16 (Dl)
2.09.40.1
FIGURE 5.3-70. ERA +0322
131

IBM 7090 Specifications

General

Category	Mainframe Computer
Introduced	1959
Transistor-based	Yes
Word Length	36 bits
Add Time	4.8 microseconds
Memory	Core memory
Memory (words)	32, 768 words