IBM Personal System/2 50 - Page 32

Adapter
Enable/Setup
Register
(Hex
0096)
The
Adapter
Enable/Setup
register
selects
the
connector
to
be
configured.
Bit Symbol
7 Channel Reset
6-4 Reserved
3 Card Setup Enable
2-0 Channel Select 2 - 0
Figure
2-7.
Adapter
Enable/Setup
Register
(Hex
0096)
BIL7
When
set
to
1,
this
bit
activates
the
‘channel
reset’
signal
to
all
connectors.
Bits6-4
These
bits
are
reserved.
Bit3
When
set
to
1,
this
bit
enables
the
‘-card
setup’
signal
selected
by
bits
2
through
0.
Bits2-0
These
bits
are
the
address
bits
for
the
‘-card
setup’
signal
Connectors
1
through
4
are
addressed
as
0
through
3,
respectively.
When
bit
3
is
set
to
1,
these
bits
select
the
connector
that
is
put
into
setup.
Each
channel
connector
has
a
unique
‘-card
setup’ signal
(-CD
SETUP)
associated
with
it.
This
signal
is
used
to
put
the
adapters
in
the
setup
mode,
which
allows
access
to
the
POS
registers.
The
individual
connectors
are
selected
through
the
Adapter
Enable/Setup
register.
Setup
information
is
then
read
from
or
written
to
the
selected
adapter
through
I/O
addresses
hex
0100
through
0107.
Notes:
|
1.
-CD
SETUP
goes
active
only
when
an
operation
is
performed
in
the
1/O
address
range
hex
0100
through
0107.
2.
The
status
of
port
hex
0096
can
be
read
by
software.
However,
when
the
port
is
read,
bits
6,
5,
and
4
are
set
to
1.
2:10
Model
50
POS
—
October
1990