Oscar Said...
>I have here an old 486DX2-66 computer and have problems with the COM1 port.
>I haven't any documentation of this PC. Last week, when I tryed to install a
>modem I found that the COM1 port didn't work, although Windows' Control
>Panel says that "This device is working properly".

If you're running Win95 then you may need to disable the COM port from CMOS and let Windows install it when the wizard launches during boot up.

It fixed a troublesome modem problem I had on a Pentium 75 using this technique.

The link below will give you more detail information.

http://support.microsoft.com/support/kb/articles/Q152/0/64.asp

Regards Roger.

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