Measurement Computing PC104-DO48H - Manual (Page 7)

Switch 1 = 200h (512D) and switch 2 = 100h (256D). Added together, they equal
300h (768D), the base address.
Figure 3-1. Address Switches and Pin 1 Locations
Certain addresses are used by the PC while others are free and can be used by the
PC104-DO48 and other expansion boards. We recommend trying the factory default
address, 300h (768D), first.
Figure 3-2. Base Address Switch Block - 300h Shown
3
S w H E X
1 2 0 0
2 1 0 0
3 8 0
4 4 0
5 2 0
6 1 0
7 0 8
1 2 3 4 5 6 7