rtfps - multiplexing serial communications interface
rtfps0 at isa? port 0x1230 irq 10
com* at rtfps? slave ?
pccom* at rtfps? slave ?
The rtfps driver provides support for IBM RT PC boards that
up to four RS-232C (CCITT V.28) or RS-422A communications interfaces.
Each rtfps device is the master device for up to four com
kernel configuration specifies these com devices as slave
devices of the
rtfps device, as shown in SYNOPSIS. The port specification
for the rtfps
device is used to compute the base addresses for the com
com(4), intro(4), isa(4)
The rtfps driver was written by Charles Hannum, based on the
The rtfps driver is unlikely to work on non-EISA and non-PCI
The ISA bus only asserts 10 I/O address lines, and this is
Even on EISA and PCI machines, some address conflicts have
On one machine, the second port always conflicted with something (though
it's not clear what) and caused strange results. Disabling
port in the kernel config allowed the other three ports to
OpenBSD 3.6 August 7, 1994
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