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IBM Personal System/2 60 User Manual

IBM Personal System/2 60
60 pages
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Memory
The
Model
60
system
uses
the
following
types
of
memory:
®
Read-only
memory
(ROM)
e
Random
access
memory
(RAM)
¢
Real-time
Clock
and
CMOS
RAM.
Read-Only
Memory
Subsystem
The
ROM
subsystem
system
board
consists
of
four
32Kb
by
8-bit
modules
in
a
64Kb
by
16-bit
arrangement
(Kb
equals
1024
bits).
ROM
is
not
parity-checked
and
is
assigned
addresses
at
the
top
of
the
first
and
last
1MB
of
address
space
(hex
0E0000
and
FENO000).
Random
Access
Memory
Subsystem
The
RAM
subsystem
on
the
system
board
starts
at
address
hex
000000
of
the
16MB
address
space.
It
consists
of
1MB
of
RAM
modules.
The
system
board
uses
four
memory
module
packages
that
operate
with
one
wait
state.
Memory-refresh
typically
occurs
once
every
15
microseconds.
The
timing
of
the
memory
signals
on
the
system
board
is
similar
to
the
Hitachi”
HB61009BR-15,
150-nanosecond
DRAM
or
equivalent.
"
Hitachi
is
a
trademark
of
the
Hitachi
Corporation.
Model
60
System
Board
—
October
1990
3-7

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IBM Personal System/2 60 Specifications

General IconGeneral
BrandIBM
ModelPersonal System/2 60
CategoryDesktop
LanguageEnglish

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