The Boca 8 port card is OK for terminals and printers: it comes with 8
six-wire RJ-11 cables, and RJ-11 to DB-25 ends for each cable. The ends
are wired in a somewhat odd arrangement such that RTS/CTS works fine for
terminals and printers, but if you add a null modem adapter, the hardware
flow control doesn't make it through that second inversion, and you have
to use Xon/Xoff flow control. Four of the ports go to one 16550A chip,
the other four go to the second 16550A. Red Hat kernels work with it
without any extra configuration, although you'll need to use the setserial
command to enable them (and notify the kernel of the IRQ you selected?).
I paid $130 for mine 5 years ago; the price should be lower now :-).
- Stephen
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