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© Sealevel Systems, Inc.
4021 Manual | SL9154 11/2021
Card Setup
The
ACB 56
contains several jumper straps which must be set for proper operation.
Address Selection
The
ACB 56
occupies 8 consecutive I/O locations. A DIP-switch (SW1) is used to set the base address for
these locations. Be careful when selecting the base address as some selections conflict with existing PC
ports. The following table shows several examples that usually do not cause a conflict.
Address
Binary
Switch Settings
A9----------A0 1
2
3
4
5
6
7
238-23F
1000111XXX
Off
On
On
On
Off
Off
Off
280-287
1010000XXX
Off
On
Off
On
On
On
On
2A0-2A7 1010100XXX
Off
On
Off
On
Off
On
On
2E8-2EF
1011101XXX
Off
On
Off
Off
Off
On
Off
300-307
1100000XXX
Off
Off
On
On
On
On
On
328-32F
1100101XXX
Off
Off
On
On
Off
On
Off
3E8-3EF
1111101XXX
Off
Off
Off
Off
Off
On
Off
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, the address 300 Hex through 307 Hex is selected.
300 Hex = 11 0000 0XXX in binary representation.
Figure 2 - DIP - switch Illustration
Setting the switch ‘On’ or ‘Closed’ corresponds to a ‘0’ in the address, while leaving it ‘Off’ or ‘Open’
corresponds to a ‘1’
.
1
2
3
4
5
6
7
ON
OFF
A9
A3
