From: Larry Anderson (foxnhare_at_bigvalley.net)
Date: 2002-05-30 05:48:34
William Levak wrote:
>
> On Wed, 29 May 2002, Larry Anderson wrote:
>
> > >
> > If you had a Plus/4 you would use one of the switches on the four switch
> > model to make the 1670 Plus/4 compatible or if you had a 3-switch model
> > I think you would cut the trace that pops out from under the the case on
> > the bottom on the PC board, like on the Modem 300 (IIRC) :-/
>
> I have a 3 switch 1670. It doesn't work, but I have one. There is no
> jumper.
>
> PS This message was sent from my C64 using the program VT100.C64 found on
> the Aprotek disk. This is the only VT100 emulator I have found that works
> correctly with Pine.
>
It doesn't look like a jumper just a trace running from under the case
across a ways and then back in... (As I said I know on the modem 300
you have it, but on the 1670 I think the 3 switch did and the four
switch was adjusted so you didn;t have to cut it...)
I looked in my Plus/4 PRG, and what PLUG newsletters I have, no mention
of it. Don't know where my 1670 manual(s) might have gone...
Aha, guess there is no cut trace on the 1670...
from Projet 64's ( http://project64.c64.org/ ) 1670 manual:
> Switch 1: Up for regular home and single-line business phones. Down
> for PBX systems (usually the 1670 Modem can function in the
> up position with PBX systems as well).
>
> Switch 2: Up for Analog Loopback self-test. See (3) below. Down for
> normal operation.
>
> Switch 3: Up for no carrier detect signal. Down for Carrier Detect on
> pin H-K of edge connector.
>
> Only Plus/4 users need be concerned with this switch. It must be
> in the UP position for successful data transmission. Other
> computers can operate regardless of how this switch is set.
>
So the trace I was talking about is only on the modem 300.
The four switch modem settings were in another P64 file on 1670 Dip Switches:
> DIP SWITCH SETTINGS
> -------------------
>
> The 'New 1670' differs from the older model in that it has 4 DIP switches
> insted of 3. Here are the proper settings for 'EBBS/64 v3.3'.
>
> #1 - UP Enables the auto answer
> function. The modem will
> answer on the 2nd ring.
>
> #2 - DOWN Enables carrier detect on
> pin H-K of the edge
> connector. (It is reported
> that this should not matter
> except for C= PLUS 4
> users, but it does work on
> the 64 in this position)
>
> #3 - UP Disables the speed indicate
> signal to pin J. This allows
> the software to detect the
> caller's baud rate.
>
> #4 - DOWN Sets DTR (Data Terminal
> Ready) to the grounded
> position.
>
--
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Larry Anderson - Sysop of Silicon Realms BBS (209) 754-1363
300-14.4k bps
Set your 8-bit C= rigs to sail for http://www.portcommodore.com/
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