10
Setting the Data Jumpers.
1. Refer
to
Figure 10-1
and
find
the
DOUT
CLEAR
and
BURST
jumpers.
2. Install
or
remove
the
jumpers
on your
HP
98622A
GPIO
card
as required by
the
peripheral
it
will be connected
to.
Refer
to
the
peripheral's manuals for
this information .
•
DOUT
CLEAR Jumper.
With
the
jumper
installed,
both
data
output
registers are cleared
at
power
up
and
after
an
interface reset.
With
the
jumper
removed, contents
of
the
register are undefined.
The
card is shipped
without
the
jumper.
If
you
intend
to
use
the
HP
9884A
Paper
Tape
Punch
with
this interface,
the
jumper
should be
in
.
•
BURST
Jumper.
With
the
jumper
installed, there is
better
overall system performance,
but
slightly slower
GPIO
performance on high-speed transfers.
With
the
removed, there is slightly degraded overall system performance,
but
better
GPIO
performance for transfers
greater
than
lOOK
transfers/second.
The
card is shipped
with
the
jumper.
If
you
intend
to
use
the
HP
9884A
Paper
Tape
Punch
with
this interface,
the
jumper
should be removed.
Adjusting the PCTL Delay. Adjust
the
PCTL
Delay
if
required.
The
PCTL
line
has
a built
in
delay
of
250ns.
Capacitor
C6
and
resistor
Rl
can
be
changed
to
adjust
the
delay:
• To increase
the
delay, increase
the
value
of
C6 40pF
per
lOOns
of
additional
delay .
• To decrease
the
delay, decrease
the
value
of
Rl
1.47k ohms
per
lOOns
of
decreased delay.
Reinstalling the GPIO Card
Insert
the
GPIO Interface, component side
up,
into
its
slot.
Tighten
the
thumb
screws on
the
metal end
plate
until
the
end
plate
is flush with
the
back
of
the
con troller.
Verification Test
10-8 Configuring Popular Accessory Cards
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