Multiple board installation 31
In addition, you must set the rotary switch of each PC/104-
Plus
board to a unique setting in the stack. Setting the rotary switch
dedicates a group of PCI signals to the board in the stack: clock,
request grant, ID select, and interrupt signals. It is
recommended that the first board installed (the board closest
to the Host CPU board) be configured to 0, the second 1, and so
on. The table below shows the recommended switch setting for
each board, as well as the corresponding setting for the
dedicated signals.
PCI connector
Host board
ISA connectors
Top screw
Switch
position
board
position
Interrupt Request
grant
ID
select
0 or 4
1
Interrupt A
0
0
1 or 5
2
Interrupt B
1
1
2 or 6
3
Interrupt C
2
2
3 or 7
4
Interrupt D
2
3
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