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COM 1/2/3/4 working on 865 Chipset

idata
Employee
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This is an embedded application, hardware manufactured by Intel's Embedded Channel Partner!

In a DOS application, onboard serial ports (COM 1/2/3/4) work fine on 875P chipset but not on 865 Chipset and beyond!

For chipsets Intel 865 and beyond only COM 1 & COM 2 work fine, while COM 3 and COM 4 show no response!

Is there any functional difference in the two chipsets which can affect COM 3/4 not to work on 865 Chipset?

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