Matrox Electronic Systems II manual Installing multiple PC/104-Plus modules

	Multiple board installation 49
	You can stack a maximum of four PC/104-Plusmodules, shown
Installing multiple
PC/104-Plus modules	in the diagram below. Note that if you have PC/104 modules in
	your computer, they must be placed at the top of the stack.
Top screw

ISA connectors

PCI connector

Host board

In addition, you must set the rotary switch of each PC/104-Plusmodule to a unique setting in the stack. Setting the rotary switch dedicates a group of PCI signals to the module in the stack: clock, request grant, ID select, and interrupt signals. It is recommended that the first module installed (the module 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 module, as well as the dedicated signals.

Switch	Module	Interrupt	Request	ID
position	position		grant	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