I'm not sure that this could hep but...
I have experienced some troubles with some on-board serial controlers in 486
and Pentium Mother boards. Some MB models use a different connector for
serial ports, with a non-standard pin position. Make sure that both serial
connectors and ribbon cables you're using are the same, because maybe they
were switched in the long life of your 486 and, like I said before, not
every connector works on that kind of board. If this not help maybe you have
defected serial port, it's pretty normal that, even though the port doesn't
work anymore windows report it as "workin properly", try a hardware test
software (like norton utilities for dos) with a serial loopback on the port.
Hope this could help
Alexandre
>Hi all:
>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".
>
>The computer has an ISA 16 controller card with FDD, HDD, and LPT, COM1,
>COM2 and a game port. The floppy, the hard disk, the printer and the serial
>mouse (on COM2) had been working perfectly well. I changed the ribbon cable
>for the mouse to the pin connector labeled COM1 on the card and Windows
>doesn't find it on start up. I am now using the modem in COM2 but without a
>mouse.
>
>I supposed that maybe knowing the jumper configuration I could find some
>answers. The card says: TS-5188 ISA VA.1 FCC ID: JP7TS-5188. Where can I
>find it?
>
>But maybe you, experienced guys in troubleshooting, can suggest me what
else
>can I try to identify what is wrong with it?
>
>TIA,
>
>Oscar.
>
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