IBM 7090 User Manual

Fire Man
Ctrl SS
4.20.04.1
Turn On
Man Ctrl Tgr
4.20.05.1
Turn On
Start Tgr
4.20.07.1
Turn Off
Man Ctrl Tgr
T urn Off
MST Tgr
4.20.11.1
Bring Up
"Not B Cycle
Interrupt"
8.00.13.1
Not B Cycle
Interrupt Gates
I, E or L Time
On at AO
Off at A8
A
6
A
11
Reset
Lites
4.20.12.1
FIGURE 6.1-3. START
ac Ine
in
~
Auto
Bring
Up Man
1
Go To E
7
4.20.06.1
Key
~
Bring Up
Clear Orl
Fire Man
4.20.06.1
Or! SS
t
4.20.04.1
t
Store Ori
Turn On
Man Or! Tgr
2.09.00.1
~
<1 ?OO<; 1
t
Bring Up
Clear Stg
Turn
On
Clear Stg Tgr
4.20.06.1
4.20.06.1
If
~
I
Turn Off
t
MST Tgr
Turn
Off Man
4.20.11.1
Ori Tgr
I
4.20.05.1
1
'---t
I'"' 55 I
4.20.12.1
ICIOOk R.", I
4.20.12.1
t
l'O'1k ood I
Reg Reset
4.20.12.1
FIGURE 6.1-4. CLEAR STORAGE
152
t
Take 1
I Cycle
Then E's
1
Write Zero
]
t
PC to AS
3.05.09.1
t
AS to AR
3.06.18.1
~
PC Advance
on Clear
E
6
4.20.06.1
t
PCTWOT~~
Off
On
3.05.00.1
f
End Op
on Clear
E6
4.20.06.1
t
Turn On
End Op
E1
o
8.00.09.1
t
Turn On
Mst Tgr
El
o
4.20.11.1

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