5-4
Chapter 5: Programming
MSR Interface
3
‐
track
MSR
and
JIS
2
‐
track
MSR
heads
are
available.
The
harness
from
the
MSR
head
plugs
into
the
main
board.
All
decode
circuitry
resides
on
the
main
board.
The
decoder
is
based
on
the
Trigantor
chip
currently
used
in
NCR
Retail
products.
The
keyboard
should
not
be
used
while
a
card
is
being
swiped
in
the
MSR.
ISO
and
JIS
card
formats
are
supported
in
the
initial
release.
All
MSR
data
is
sent
to
the
host
via
the
Wedge
Controller.
PS/2 Keyboard Interface
A
PS/2
‐
style
keyboard
connector
permits
alphanumeric
entry
and
non
‐
touch
applications
to
be
used
through
a
standard
PC
keyboard.
You
cannot
connect
and
use
a
Wedge
Keyboard
in
this
port.
Panel OFF/ON Sequence
Before
turning
the
Panel
Off,
turn
off
the
video
using
Sequencer
Register
1
bit
5
(SR01[S])
in
the
same
manner
as
IBM
recommends
for
the
standard
VGA.
To
make
Video
Off
more
effective,
some
additional
delay
should
be
included
before
Panel
Off.
By
turning
the
Video
Off
via
SR01[5],
the
Sequencer
is
no
longer
refreshing
the
screen.
This
gives
the
Sequencer
enough
bandwidth
to
work
with
the
Panel
Off
logic
to
do
an
orderly
shutdown
of
the
video
output.
