Arcane modem configuration

[Greg Noel]

In article <42 at houligan.UUCP> dave at murphy.UUCP (Lerxt) writes:
>Two problems with this: 1: Some older async interfaces, like the DZ11, do
>not have interrupts for the modem control lines, so the driver has to poll
>them.  If you have 80 async ports and most of them are direct-connect, you
>probably don't want the driver polling all 80 of them for ring indicator
>continuously.  2: What about current-loop or other non-RS232 interfaces?

1.  No matter how many ports you have, if \one/ of them has modem control,
    you have to take the polling interrupt, so you may as well poll them
    all -- the additional cost is negligible; the expensive part is taking
    the interrupt.

2.  What about them?
-- 
-- Greg Noel, NCR Rancho Bernardo    Greg at ncr-sd.UUCP or Greg at nosc.ARPA