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IEEE488
MANUAL
GENERAL
2.0
HARDWARE
INSTALLATION
TheIE488
board
requires
one
slot
in
the
IBM-PC
and
16
consecutive
address
locations
in
I/O
space.
The board
also
requires
a free
16 K-byte
block
of memory for
the on board
12K-
byte
ROM interpreter
and 4K-byte
Static
Ram. Some I/O
address
locations
will
be
occupied
by
internal
I/O
and
your
other
peripheral
cards,
so to provide
flexibility
in avoiding
conflict
with
thesedevices
the
IE488
I/O
address
can be set
by the
Base
Address
D.I.P.
switch
to be on any 16 bit
boundary
in the
IBM -
PC decoded
I/O
space.
This
also
makes
possible
the
use of
a
second
IE488
interface
board
in the
same computer.
The I/O
map
for
IBM's
standard
Internal/External
peripherals
is
listed
on
page 2-23 of the "IBM Technical
Reference
Manual".
Usually,
a good choice
is to put the
IE488
at base address
&H300 or &H310 (Decimal
768,784).
(Note
if
you are using
the
IBM
prototype
interface
board,
it
uses the hex 300 -3lF
address
space
and would
be in conflict).
There
are three
groups
of switches
on the
IE488
interface
card.
The Base Address
switch
is
located
on the
top
left
corner
and
marked BASE ADDRESS. The switch
settings
are
listed
as follows:
DEVICE I/O ADDRESS BITS
(msb)
(lsb)
A9
AS
A7
A6
A5
A4
Example
shows
address
bits
11
0
0
0
0
ADDRESS = &H300
switch
pos.
dn
dn
up
up
up
up
A switch
in the up (on) position
corresponds
to a ZERO (0) in the
address
bit.
Similarly,
a ONE (1) is set
in the address
bit
when
the
switch
is
in
the
down
(off)
position.
The example
switch
setting
above
shows
the
address
switch
selecting
&H300
(768
decimal)
for
the Base I/O Address.
NO CRECK
IS
MADE
ON THE
BASE
ADDRESS
WHEN
INITIALIZED,
BE SURE
THAT
THE
BASE
ADDRESS
SELECTED
DOES
NOT
CONFLICT
WITH
ANY
OTHER
PERIPHERALS.
The next
switch
is the MEMORY ADDRESS switch.
This
switch
selects
the
16 Kbyte
block
of memory on an even
16 Kbyte
boundary.
The
addressing
of
the
switches
corresponds
to
the
absolute20bit
address
location
in
16 Kbyte
increments.
The MEMORY ADDRESS
switch
is
located
above the gold
edge connector.
MEMORY ADDRESS BIT
(msb)
A19
A18
Al7
Al6
Al5
address
bits
1
1
0
0
0
s
(lsb)
Al4
Example
for
0
MEMORY ADDRESS
Page 6
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