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IBM 7090 User Manual

IBM 7090
190 pages
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Decrement
\
Flag
Tag
I I i I
Address
, 1 , ,
'---.r-'
---..,..-....
Indirect Effective
Address Address
CPU
Instruction
Word
Address Modification Fields
Variable
Length Shift
M
py
or
Div
Count Count
.
, ,
I < <
213:
: : : : :
11
~
112:
: : : : 1
~
: :
121:
: : : : 1
28
: : : : : : : :
3~
\
'~\------~~------------~
Con~ert
Address
Count
CPU
Instruction
Word
Count Fields
FIGURE
2.5-1.
CPU
INSTRUCTION
WORD
VARIATIONS
Following
the
study
of
the
instructions
and
commands
used
in
the
7090
system,
study
the
operation
of
the
individual
current
switching
component
circuits
that
make
up
the
system.
These
are
explained
in
Transistor
Components
Circuits,
IBM
Customer
Engineering
Manual
of
Instruction,
Form
223-6889.
These
books,
together
with
the
information
previously
presented
in
this
manual,
comprise
the
information
needed
to
continue
the
study
of
this
manual
beyond
this
point.
The
following
information
in
this
manual,
although
generally
in
outline
form,
is
quite
specific
and
requires
the
use
of 7090
systems
diagrams
to
provide
maximum
benefit.
22

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IBM 7090 Specifications

General IconGeneral
CategoryMainframe Computer
Introduced1959
Transistor-basedYes
Word Length36 bits
Add Time4.8 microseconds
MemoryCore memory
Memory (words)32, 768 words