Xref: utzoo comp.sys.att:2603 comp.unix.questions:5812
Path: utzoo!utgpu!water!watmath!clyde!mcdchg!chinet!randy
From: randy@chinet.UUCP (Randy Suess)
Newsgroups: comp.sys.att,comp.unix.questions
Subject: Re: Hayes modem for 3B2
Keywords: hardware fix
Message-ID: <2860@chinet.UUCP>
Date: 25 Feb 88 17:07:40 GMT
References: <450@stech.UUCP> <248@tsc3b21.UUCP>
Reply-To: randy@chinet.UUCP (Randy Suess)
Organization: Chinet - Public Access Unix
Lines: 23

In article <248@tsc3b21.UUCP> crash@tsc3b21.UUCP (Frank "crash" Edwards) writes:
>
>Now if I could only find some *EASY* way to fix the DCD/DTR brain-damage ;-).
>

	Don't know if you would call it easy, but I solved this
	problem years ago by putting 2 555 one shots in series
	triggered off the CD lead of the modem and feeding into
	the CD input on the port.  Basically, you wire it up so
	that the tail end one shot is sitting hi normally so that
	the 3b2 can dial out ok.  The front end-one shot is set to
	trigger on CD going away (negative edge triggered) when a 
	login hangs up.  This then makes the tail end one shot 
	drop CD to the 3b2 for a couple of seconds, terminating the 
	call.  When it comes back up, the 3b2 can dial out, or a 
	remote login can trigger the uugetty with a c/r.

-randy

-- 
that's the biz, sweetheart.....
Randy Suess
..!ihnp4!chinet!randy