Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!torsqnt!tmsoft!masnet!canremote!gary.farmaner
From: gary.farmaner@canremote.uucp (GARY FARMANER)
Newsgroups: comp.sys.cbm
Subject: Re: RS-232 (modem) interfaces
Message-ID: <89090310144444@masnet.uucp>
Date: 1 Sep 89 20:15:00 GMT
Organization: Canada Remote Systems Limited, Mississauga, ON, Canada
Lines: 15

Frank,
 
 Generally the very cheap interfaces (which refer to themselves as MODEM
interfaces) are TTL, and only support a minimum number of RS-232 lines. 
(for example, the Supra interface doesn't support DTR, which makes it 
useless for BBS purposes).
 
 Those that full RS-232 interfaces, have propert RS-232 level conversion
and support a full set of RS-232 lines. This is very important if you 
want to use an MNP modem, since they only work properly if the CTS line 
is supported (although a kludgy XON/XOFF is usually available).
 
Gary
---
 * Via ProDoor 3.01R