clark.wbst@Parc-Maxc@sri-unix (12/10/82)
Date: 7 Dec 1982 10:55 EST
I am looking at modems for UUCP. I understand that the original hayes works
quite well.
Does anyone have any experience with the Smartmodem 1200 ?
Has UUCP been brought up on it?
If not, will it work in a degraded mode with the existing software?
Thanx..
--Ray Clark
{ucbvax!}clark.wbst@parc-maxchartwell%Shasta@SU-Score@sri-unix (12/16/82)
From: Steve Hartwell <hartwell%Shasta at SU-Score> Date: Friday, 10 Dec 1982 14:39-PST We have the Hayes-Stack smartmodem 1200 here on Shasta at Stanford University. I wrote a version of dialout() for uucp when we got the 300 baud one, and it essentially worked fine on the 1200 baud one at 300 baud (answering your last question first, will it work in degraded mode with existing software..). The smartmodem 1200 has one major design flaw, as far as I can tell: it tries to decide at the time of the connection what baud rate it will talk at by listening to the type of carrier. Once it makes up its mind on a particular rate, nothing can be done to change its mind. In other words, if it calls up a system which has its dialins initially at 300 baud, and cycles to 1200 on break or null, it will hear the 300 baud carrier, decide to talk at 300 baud, and you're stuck with it -- you can convince the remote system to cycle up to 1200 baud by sending nulls, but the Hayes-Stack "smart"modem will not change its reception speed. Fortunately, most systems start at 1200 and cycle down to 300 if necessary, so this is not too bad, since you get first crack at the higher baud rate. The uucp routine dialout() I wrote seems to have worked more or less reliably for about 9 months now. Steve Hartwell