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From: porter@cbmvax.cbm.UUCP (Jeff Porter)
Newsgroups: net.micro.cbm
Subject: Re: 1670 modem repair
Message-ID: <152@cbmvax.cbmvax.cbm.UUCP>
Date: Fri, 25-Apr-86 21:50:49 EDT
Article-I.D.: cbmvax.152
Posted: Fri Apr 25 21:50:49 1986
Date-Received: Sun, 27-Apr-86 07:26:01 EDT
References: <410@marque.UUCP> <3083@sunybcs.UUCP>
Organization: Commodore Technology, West Chester, PA
Lines: 23

> I'm certainly not an expert on cbm hardware, but I know I can't turn off
> my disk drive while my printer is printing. Even though they are not
> related. It has something to do with the random power surges (?) present
> when turning the system on or off send signals to the computer that
> all hardware is turned off. Maybe your modem problem is related to this.
> (Like I say, I'm no expert.)

The disk is pulling down the reset line, and the printer sits in a
continuously reset state.

> 
> What do you mean by "near Hayes compatible"? I'm in the market for a 1200
> baud modem and would like Hayes compatibility.

I don't support ALL of the S registers, other than that, the 1670 hangs
up the phone automatically after getting a +++.  Most other Hayes
modems, you must then issue a ATH to hang up.  I don't have ALL of the
DIP switch settings, but these are available through software.  It
comes bundled with a nice VT100 program for the 128 in 80 columns.
Noise immunity is VERY good.  Compact design.  Commodore price.

Jeff Porter
Commodore Engineering