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From: greg@ncr-sd.UUCP (Greg Noel)
Newsgroups: net.unix-wizards
Subject: Re: Arcane modem configuration
Message-ID: <1163@ncr-sd.UUCP>
Date: Tue, 9-Sep-86 02:17:58 EDT
Article-I.D.: ncr-sd.1163
Posted: Tue Sep  9 02:17:58 1986
Date-Received: Tue, 9-Sep-86 06:21:58 EDT
References: <42@houligan.UUCP>
Reply-To: greg@ncr-sd.UUCP (Greg Noel)
Organization: NCR Corporation, San Diego
Lines: 15

In article <42@houligan.UUCP> dave@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@ncr-sd.UUCP or Greg@nosc.ARPA