Solution:

All in one CPU boards are pretty much short of free IRQs. Therefore, it seems impossible to use with PCM-3640 PC/104 module. (It does not provide sharing IRQ funciton so system needs free 8 IRQ channels ! ). Suggest to use PCI-1610 ( If you use RS-422 or 485, please use PCI-1612). This PCI card can provide sharing IQR function. It only occupy one IRQ channel. (Also has Windows NT 4.0 driver). If it is too high to stand on the PCI slot for customer's chasis, Riser cards PCM-110, PCM-120, or POS-102, can make it turn by 90 degrees.