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n.
Figure 3-4
Starting
Address
hi
00H
10H
20H
30H
40H
50H
60H
7 OH
80H
90H
AOH
BOH
COH
DOH
EOH
FOH
North Star HSIO-4
The hexadecimal digit X used as part of the
I/O address is set by the four switches
located in the upper right corner of the board
(Location 8B).
The four switches yield a total of 16 possible
switch settings; each switch setting selects a
starting address for the I/O board. Unless
otherwise directed by the software manual you
are using, use the switch setting illustrated
in Figure 3-5 at left, which sets the starting
address at 10H.
If the software you are using requires a
different starting address, consult Table 3-2
below for the switch setting that corresponds
to the required starting address.
Table 3-2
I/O ADDRESS SWITCH SETTINGS
Switch Number
____M ____A5____ A4
0
0
0
0
0
0
0
0
1
0
0
1
0
1
0
0
1
0
0
1
1
0
1
1
1
0
0
1
0
0
1
0
1
1
0
1
1
1
0
1
1
0
1
1
1
1
1
1
Reserved Address Regions
0
Used by the HORIZON motherboard
1
0
1
0
1
0
Reserved for North Star use
1
Reserved for North Star use
0
1
0
1
0
Used by North Star RAM boards
1
0
1
21
User/Technical Manual
0 = Off
1 = On
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