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The Dual SIO contains several jumper straps which must be set for proper
operation.
Address Selection
Each port on the Dual SIO occupies 8 consecutive I/O locations. A
DIP-switch is used to set the base address for these locations. Be careful
when selecting the base address as some selections conflict with existing
ports. The following table shows several examples that typically do not
cause a conflict. S1 sets the I/O address for port 1 of the Dual SIO and S2
sets the address for port 2.
Address
Binary
Hex
A9
A0
280-287
1010000XXX
2A0-2A7
1010100XXX
2E8-2EF
1011101XXX
2F8-2FF
1011111XXX
3E8-3EF
1111101XXX
300-307
1100000XXX
328-32F
1100101XXX
3F8-3FF
1111111XXX
Figure 1 - Address Selection Table
The following illustration shows the correlation between the DIP-switch
setting and the address bits used to determine the base address. In the
example below, address 300 is selected as a base. Address 300 in binary
is XX11 0000 0XXX where X = a non-selectable address bit.
A9
ON
1
Figure 2 - DIP-Switch Illustration
Note: Setting the switch "On" or "Closed" corresponds to a "0" in the
address, while leaving it "Off" or "Open" corresponds to a "1".
Refer to Appendix A for common address contentions.
Sealevel Systems Dual SIO
Card Setup
Switch Position Setting
1
2
3
Off
On
Off
Off
On
Off
Off
On
Off
Off
Off
On
Off
Off
Off
Off
Off
Off
Off
Off
On
Off
Off
On
Off
Off
Off
Off
A3
EN
2
3
4
5
6
7
8
Card Setup
4
5
6
7
On
On
On
On
On
Off
On
On
Off
On
Off
Off
Off
Off
Off
On
Off
On
On
On
On
On
Off
On
Off
Off
Off
Off
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