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NetBSD 6.1.5 - man page for rtfps (netbsd section 4)

RTFPS(4)			   BSD Kernel Interfaces Manual 			 RTFPS(4)

NAME
     rtfps -- multiplexing serial communications interface

SYNOPSIS
     rtfps0 at isa? port 0x1230 irq 10
     com2 at rtfps0 slave 0
     com3 at rtfps0 slave 1
     com4 at rtfps0 slave 2
     com5 at rtfps0 slave 3

DESCRIPTION
     The rtfps driver provides support for IBM RT PC boards that multiplex together up to four
     EIA RS-232C (CCITT V.28) or RS-422A communications interfaces.

     Each rtfps device is the master device for up to four com devices.  The kernel configuration
     specifies these com devices as slave devices of the rtfps device, as shown in the synopsis.
     The port specification for the rtfps device is used to compute the base addresses for the
     com subdevices.

FILES
     /dev/tty0?

SEE ALSO
     com(4)

HISTORY
     The rtfps driver was written by Charles Hannum, based on the ast driver.

BUGS
     The rtfps driver is unlikely to work on non-EISA and non-PCI machines.  The ISA bus only
     asserts 10 I/O address lines, and this is not enough.

     Even on EISA and PCI machines, some address conflicts have been observed.	On one machine,
     the second port always conflicted with something (though it's not clear what) and caused
     strange results.  Disabling the second port in the kernel config allowed the other three
     ports to function correctly.

BSD					  August 7, 1994				      BSD


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