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4. If the default I/O port address setting (0280) conflicts with the I/O
port address of another device in your PC, change the setting for
this board by doing the following:
a. Refer to Figure B-2 and locate switch SW570 on the Audio
Communications board
This switch has eight sliding DIP switches. A switch in the
up position is a logical 0, and a switch in the down position
is a logical 1. Figure B-2 illustrates the position of the DIP
switches for the default I/O port setting, which is
hexadecimal 0280.
I/O port addresses are expressed in hexadecimal and can be
assigned 0000 to 3FC0 in increments of 64 (40 hexadecimal).
The I/O port address takes the form
xyz0
where
x is designated with switches 13 and 12 and can be
hexadecimal digits 0, 1, 2, or 3
y is designated with switches 11 through 8 and can be
hexadecimal digits 0 through F
z is designated with switches 7 and 6 can be
hexadecimal digits 0, 4, 8, or C
0 is preset and is not defined by a switch
Table B-1 on the next page provides the switch settings for
each hexadecimal digit. The leftmost column lists the 16
hexadecimal digits. The remaining columns show you how
to set each switch for that digit.
Changing Settings on the Audio Communications Board
.
B-5
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