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Card Setup
Omega Engineering OMG-COMM8-A Page 3
Card Setup
The OMG-COMM8-A contains several jumper straps that must be set for
proper operation.
Address Selection
The OMG-COMM8-A occupies 64 I/O locations and can be addressed
two different ways. If header E1 is set to the “Switch” position the OMG-
COMM8-A occupies 64 consecutive I/O locations and the DIP-switch is
used to set the base address for these locations. The starting address for
these 64 I/O locations must be on a 64-byte boundary i.e.: Hex 200, 240,
280, or 2C0. 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 Switch Position Setting:
1 2 3 4 5 6 7
100-13F On On On On Off On On
180-1BF On On On On Off Off On
240-27F On On On Off On On Off
280-2BF On On On Off On Off On
2C0-2FF On On On Off On Off Off
300-3FF On On On Off Off On On
500-53F On On Off On Off On On
580-5BF On On Off On Off Off On
1500-153F Off On Off On Off On On
1580-15BF Off On Off On Off Off On
Figure 1 - Address Selection Table
Note: Some of these selections may not be valid for your system, due to
port contention. If in doubt, call Sealevel Technical Support
(864) 843-4343 for assistance. These addressing restrictions are
simplified when using the “PAL” option.
Note: If Xenix is the operating system and COM1 is not installed, use base
address 500 Hex and IRQ 4 (Xenix COM1:). If COM1: is installed,
then select 580 Hex as a base address and IRQ 3 (Xenix COM2:).