IBM Personal System/2 50 User Manual

Setup
functions
respond
to
I/O
addresses
hex
0100
through
0107
only
when
their
unique
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
(hex
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
(hex
0094)
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
(hex
0096)
must
be
set
to
1
to
allow
adapter
setup.
¢
Bit
5
in
the
System
Board
Enable/Setup
register
(hex
0094)
must
be
set
to
1
to
avoid
driving
a
‘setup’
signal
to
the
Video
Subsystem.
*
Bit
7
in
the
System
Board
Enabie/Setup
register
(hex
0094)
must
be
set
to
1
to
avoid
driving
a
‘setup’
signal
to
a
system
board
function.
Other System Board Setup:
*
Bit
7
in
the
System
Board
Enable/Setup
register
(hex
0094)
must
be
set
to
0
to
allow
setup
of
other
system
board
functions.
¢
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
5
in
the
System
Board
Enable/Setup
register
(hex
0094)
must
be
set
to
1
to
avoid
driving
a
‘setup’
signal
to
the
Video
Subsystem.
2-4
Model
50
POS
~—
October
1990

IBM Personal System/2 50 Specifications

General

Brand	IBM
Model	Personal System/2 50
Category	Desktop
Language	English