7
© Sealevel Systems, Inc. 3405 Manual | SL9144 6/2021
Card Setup, Continued
The second mode of address selection provides the compatibility mode. In this mode the DIP-switch sets
the base address, and the adapter occupies 32 consecutive I/O locations. The following table illustrates
the location of each port and its relationship to the other ports.
For switches 1-5 to become active, switches
6, 7 & 8 must be set in the ‘On’ or ‘Up’ positio
n.
Switch Settings
Address lines
à
A9
A8
A7
A6
A5
Address Selected
1
2
3
4
5
280-29F
Off
On
Off
On
On
2A0-2BF
Off
On
Off
On
Off
380-39F
Off
Off
Off
On
On
1A0-1BF
On
Off
Off
On
Off
2E0-2FF
Off
On
Off
Off
Off
Figure 2 - 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 2E0 is selected as a base. Address 2E0 in
binary is XX 10 111X XXXX where X = a non-selectable address bit.
Port #
Connector Location
Address
Example (Base=2E0)
1
1
Base+0
2E0-2E7
2
2
Base+8
2E8-2EF
3
3
Base+16
2F0-2F7
4
4
Base+24
2F8-2FF
Figure 3 - Port to Connector Table
1
2
3
4
5
6
7
8
ON
OFF
A9
A5
