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Many 486 PCs (old) and all Pentiums (or the like) should have
modern 16550As (usually called just 16550's) with FIFOs. If you have
something really old (pre 1990), the chip may unplug so that you may
be able to upgrade by buying a 16550A chip and replacing your existing
16450 UART. If the functionality has been built into another type of
chip, you are out of luck. If the UART is socketed, then upgrading is
easy (if you can find a replacement). The new and old are pin-to-pin
compatible. It may be more feasible to just buy a new serial card on
the Internet (few retail stores stock them today) or find a used one.
Modern kernels should not allow the opening of ports with the same
IO address. But one may probe for ports that are not open. If two
ports have the same IO address then probing it will erroneously
indicate only one port. Plug-and-play detection will find both ports
so this should only be a problem if at least one port is not
plug-and-play. All sorts of errors may be reported/observed for
devices illegally "sharing" an IO address. See
Probing.
END OF Serial-HOWTO
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