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From: porter@cbmvax.cbm.UUCP (Jeff Porter)
Newsgroups: net.micro.cbm
Subject: Re: 1670 modem repair
Message-ID: <123@cbmvax.cbmvax.cbm.UUCP>
Date: Mon, 21-Apr-86 19:36:31 EST
Article-I.D.: cbmvax.123
Posted: Mon Apr 21 19:36:31 1986
Date-Received: Wed, 23-Apr-86 22:28:44 EST
References: <410@marque.UUCP>
Organization: Commodore Technology, West Chester, PA
Lines: 54

> 
> 	If anyone has ever considered buying a modem for Commodore's micros,
> I can highly recommend the new 1670.  The software that comes with it (such
> as emulators, terminal programs, etc.) are invaluable and the near
> Hayes-compatibility make the 1200 bps modem a required peripheral (I live in
> a freshmen dorm, so my modem watches my phone line at night for prank calls).
> 	My modem, however, has a problem.  You see, it's quite incon-
> siderate.  It works just fine if my disk drive is turned on while I
> use my modem.  That's its trick.  When I think it's going fine and turn
> the disk drive off for the night, the modem becomes nasty if I want to
> dial out ("ATD...").  After the modem dials the number, it waits no more
> than a half second when SUDDENLY it spits out a bunch of loud glitches,
> mostly x's, which knock me off the line!!  How obnoxious!
> 	I've tried ATZ and ATS7=10 to stop the cruelty, but they do 
> nothing.  I wrote to Commodore Customer "Support" and all I got
> was an ad and a free sample of Commodore Microcomputer Magazine
> (Perhaps I should complain monthly?).  The only way I've found that
> works is to turn the 1541 back on, but I don't want to do that.
> 	Does anyone have any suggestions?  Does Commodore service the
> equipment?  Is there something inside that I can fix?  Repair?  Advice
> or instructions would be greatly appreciated.
>    
>                                                 Dennis Flaherty
>                                                   Marquette University
>     
>                                  ihnp4!uwmacc!uwvax!uwmcsd1!marque!dennisf

Dennis,

Your 1670 is working just fine.  The problem is that you are turning
off your disk drive.  The disk and the modem share the same reset line,
and when you turn your disk off, it pulls down the reset line on the
modem.  Well, it doesn't pull it down all the way, and hence the modem
gets upset - being half way between reset and not reset.

You have the following choices:

1. Turn everything OFF when not in use.  The obvious choice.

2. Keep everything ON when not in use.  This means the disk drive too,
but I imagine that you want to keep the drive from overheating.

Therefore we offer choice 3:

3. Before turning off your disk drive, unplug the serial connector,
and then turn off the disk drive.  This way, your disk stays nice and
cool and your modem doesn't get upset.

Personally I recommend choice 1.  I hope this helps.


Jeff "Mr. Modem" Porter     Commodore Engineering   ihnp4!cbmvax!porter

PS: Thanks for the compliment on the 1670.