IBM Personal System/2 65 SX User Manual

Setup
functions
respond
to
I/O
addresses
hex
0100
through
0107
only
when
the
setup
signal
is
active.
The
following
precautions
must
be
taken
before
setting
individual
bits
in
the
POS
registers.
System-Board
Video
Subsystem
Setup:
Bit
5
in
the
System-Board
Enable/Setup
register
(nex
0094)
must
be
set
to
0
to
place
the
system-board
video
into
the
setup
mode.
Bit
3
in
the
Adapter
Enable/Setup
register
(hex
0096)
must
be
set
to
0
to
avoid
driving
a
‘setup’
signal
to
an
adapter.
Bit
7
in
the
System-Board
Enable/Setup
register
must
be
set
to
1
to
avoid
driving
a
‘setup’
signal
to
other
system-board
functions.
Adapter Setup:
Bit
3
in
the
Adapter
Enable/Setup
register
must
be
set
to
1
to
allow
adapter
setup.
Bit
5
in
the
System-Board
Enable/Setup
register
must
be
set
to
1
to
avoid
driving
a
‘setup’
signal
to
the
video
subsystem.
Bit
7
in
the
System-Board
Enable/Setup
register
must
be
set
to
1
to
avoid
driving
a
‘setup’
signal
to
a
system-board
function.
Other
System-Board
Setup
Requirements:
Bit
7
in
the
System-Board
Enable/Setup
register
must
be
set
to
0
to
allow
setup
of
other
system-board
functions.
Bit
3
in
the
Adapter
Enable/Setup
register
must
be
set
to
0
to
avoid
driving
a
‘setup’
signal
to
an
adapter.
Bit
5
in
the
System-Board
Enable/Setup
register
must
be
set
to
1
to
avoid
driving
a
‘setup’
signal
to
the
video
subsystem.
2-4
Modei
65
POS
—
October
1990

IBM Personal System/2 65 SX Specifications

General

Brand	IBM
Model	Personal System/2 65 SX
Category	Desktop
Language	English