RE: Modem questions

From: Ray Bryan (
Date: 2002-05-30 01:19:02

On Wed, May 29, 2002, at 03:16 PM, William Levak wrote:

> I have a Commodore 1670 modem with 4 dip switches next to the telephone
> connector.  My manual mentions only 3 switches.  Does anyone know what the
> fourth switch is for (if anything)?

There were 2 models of the 1670 though I do not know why.  Th book you have is
for one type and the modem is the other the switch functions are not quite
the same as I recall- and I have the docs to prove it.

3 switch model sw1 up -- regular home/single line
                   dn -- PBX multi-line 
               sw2 up -- Amanlog loopback seft-test                   
                   dn -- normal operation
               sw3 up -- no carrier detect signal        
                   dn -- for carrier detect signal on pin h-k of the edge connector
4switch model  sw1 dn -- Auto answer suppressed                   
                   up -- answer on 2nd ring
               sw2 dn -- carrier detect on H-K edge of connector    
                   up -- no carrier detct
               sw3 dn -- enable the speed indicate signal to the computer                        
                   up -- disable speed indicate  
               sw4 dn -- DTR always on    
                   up -- DTR normal computer controls DTR signal

|Raymond C. Bryan  651-642-9890 vox | The battle is sometimes |
|Raymond Computer  651-642-9891 fax | to the small for        |              
|795 Raymond Ave   -email:  raycomp | the bigger they are     |
|St Paul MN  55114     | the harder they fall.   |
|USA              Amiga - Commodore |     -- James Thurber -- |

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