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GPIB IEEE488 MANUAL
INSTALLATION
The last
switch
setting
is
the
selected
DMA channel.
The switch
is part
of the bank of four
switches
used for
the interrupts.
The
switch
is marked DMA (1 - 3),
up is Channel
3, down is channel
1.
In IBM-PC's
equipped
with
floppy
disk(s)
only,
DMA level
3 should
be used.
Hard disk
equipped
machines
(XT models)
force
the
user
to utilize
DMA level
1. This
is
somewhat
restrictive,
since
due
to the hardware
design
of the
IBM-PC,
DMA level
1 page register
is the
same
as
DMA
level
0
(memory
refresh).
For
more
information
see Appendix
A.
The board
is shipped
with
the following
switch
settings.
MEMORY ADDRESS = COO00 hex
BASE ADDRESS
= 300
hex
INTERRUPT #
= 5
DMA CHANNEL
= 3
Having
made the
switch
settings,
you can now install
the
IE-488
board.
First
remove
the
board
from
its
protective
eIectrostatic
packaging.
It
is a good precaution
to discharge
any electrostatic
charge
you
may
have
accumulated
by touching
the
metal
frame
of
your
computer
(you should
have
it
grounded
for
safety).
Next,
if
you have not already
done so, TURNOPPTHEPOWERonyour
computer
and
take
off
the
case
(see
IBM
"Guide
to
Operations"
for
reference).
Remove a vacant
back
plate
by undoing
the
screw
at
the top and press
the card
guide
supplied
with
the
IE-488
board
on the
opposite
side
of
the
case
(some
models
may
not
require
this).
Slip
the
IE-488
board
in and secure
the
backplate.
That
completes
the hardware
installation.
One
more
precaution
concerning
storage
and handling
of
the
IE-488
interface
board.
MetraByte
recommends
that
you retain
the
special
electrostatically
shielded
package
and
use
it
for
protective
storage
of the board
if
for
any reason
it
is removed
from
your
computer.
Page 8
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