IBM RS/6000 - Manual (Page 146)

Notes:
Refer to the document Adapters, Devices, and Cable Information for Multi
Bus Systems, SA38-0516-00, for detailed information on DIP-switch
positions for setting other parameter values.
The on and off DIP-switch selections are set by switching them down and
up, respectively. The mapping is:
off = up
on = down
a This switch is factory set to indicate the size of RAM installed on the
adapter. Verify that the position of this switch is on to reflect a RAM size of
512 KB.
b Indicates whether a one-edge (62-pin) or a two-edge (62-pin and
36-pin) connector is used to hold your adapter.
on = two-edged / off = one-edged
c Sets the bus width and should generally be set to 8-bit.
on = 8-bit / off = 16-bit
6.7.2 Configuring the Adapter
The following procedures apply to every PCI-based RS/6000 system that supports
the X.25 Interface Co-Processor ISA Adapter.
The configuration for this adapter requires you to specify the Interrupt Level, the
Bus I/O Address and the Bus Memory Address to be used with the adapter.
1. Check if there are any ISA adapters that are already installed in your computer
by using the following command:
lsdev -Cc adapter -s isa
Default Parameters
If this is the first adapter of this type on the system, you may select the
default values:
Interrupt Level = 11
Bus I/O Address = 0x2a0
Bus Memory = 0X0e0000
and go directly to step number 9.
2. If any ISA adapter is installed, check for available Interrupt Level values by
entering the following command:
lsresource -l bus -a | grep bus_intr
This command generates a list of adapters using different Interrupt Levels that
looks similar to the following:
N fda bus_intr_lvl 6 (A )
N sa bus_intr_lvl 4 (A )
N sa1 bus_intr_lvl 3 (A )
N sioka bus_intr_lvl 1 (A )
N sioma bus_intr_lvl 12 (A )
122 Introduction to PCI-Based RS/6000 Servers