About serial ports
A serial card may contain several serial ports and may come
with its own driver (a ``smart'' or ``intelligent'' card).
A card may either be plugged into an expansion slot on the
motherboard of your computer, or built into the motherboard
itself. A serial card that does not have its own driver
is known as a ``dumb'' card.
Before adding a single-port serial card or a
multiport expansion card, determine
whether the card is a smart
serial card or an SCO OpenServer-supported dumb serial card.
If it is a smart card (such as the Arnet Smartport),
the manufacturer will have supplied installation software
and a driver. This should be all you need to add the card
to an SCO OpenServer system. Follow the instructions provided
with your card, referring to your computer
hardware manual if necessary.
For ISA and EISA buses:
Support for a single-port dumb
serial card on COM1 and COM2
is configured into the kernel by default.
A single-port serial I/O card on COM1 will work
as expected with an SCO OpenServer system provided it
conforms to the standard IBM specification.
The serial driver in SCO OpenServer allows ISA serial ports
on COM1 to use IRQ 4, and
ISA serial ports on COM2 to use IRQ 3.
Unlike the standard IBM interrupt scheme, however,
the serial driver does not allow serial ports
on COM3 or COM4
to share interrupt vectors with COM1 or
COM2, and it does not support polling.
For the PCI bus:
All supported dumb PCI serial cards are auto-detected
at boot-time, however, corresponding device nodes are not
created until you run the Serial Manager
or mkdev serial. If the Serial Manager does
not list your PCI serial card, it may
be an unsupported card, it may not be configured
correctly, or it may require a driver from the
An error message such as ``cannot create'' or ``cannot open''
is displayed if you attempt to access a
serial port that is not physically installed and defined.
Adding and configuring serial cards
Adding serial and parallel ports
© 2005 The SCO Group, Inc. All rights reserved.
SCO OpenServer Release 6.0.0 -- 03 June 2005