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Switch positions 1 - 7 of S1 configure the I/O address of the
WDT. Switches represent a binary 0 in the ON position, a binary 1
when OFF. Least significant bit (LSB) and most significant bit (MSB)
are labeled on the card. Table 1 shows the numerical weight and
electrical connection of each switch.
S1 Position
Bus
Connection
Decimal
Weight
Hex Weight
Any I/O address may be used, but it is important that no other
device in the host computer use that address. Table 2 is a list of
frequently unused I/O addresses. In most cases, the WDT can be
set to one of these addresses.
Table 2. Frequently Unused Port Addresses
Base Hex
Address
Equivalent
200
1000000000
208
1000001000
300
1100000000
308
1100001000
310
1100010000
318
1100011000
380
1110000000
388
1110001000
3A0
1110100000
3A8
1110101000
4
Table 1. Address Switches
7
6
5
SA9
SA8
SA7
512
256
128
200
100
80
Binary
MSB
1000000
1000001
1100000
1100001
1100010
1100011
1110000
1110001
1110100
1110101
4
3
SA6 SA5
64
32
40
20
Switch
I/O Space
Settings
Description
LSB
game port
game port
prototype
prototype
prototype
prototype
SDLC
SDLC
bisync comm
bisync comm
Documentation Number ATxWDT-1303
2
1
SA4
SA3
16
8
10
8
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