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1990-11-05
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17KB
From dinolt%wdl45@wdl1.wdl.fac.com Thu Oct 4 07:59 PDT 1990
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Date: Thu, 4 Oct 90 07:55:56 PDT
From: dinolt%wdl45@wdl1.wdl.fac.com (George W Dinolt)
Message-Id: <9010041455.AA01195@wdl45.wdl.fac.com>
To: ekrimen@cscihp.ecst.csuchico.edu (Ed Krimen)
In-Reply-To: ekrimen@csuchico.edu's message of 4 Oct 90 04:55:42 GMT
Subject: Multisync for ST
Hi:
I have just finished setting up the Talon switcher box and have it
running a Multisync. In my case it is a Nec MultSync II. (The IIa
won't work because it is not a true multisync but only works on some
specific frequencies used by VGA/EGA/CGA IBM graphics cards.) Be very
careful in getting your monitor. I tried a somewhat cheaper monitor
which wasn't quite up to the specs and I almost burned it up
(literally). $450 is not a bad price for a monitor which meets the
specs, as far as I can tell. If you get the Acer from Talon, it
should work. I saw the setup at a show and it worked well and looked
good.
The Talon switcher box comes with instruction as to what is needed of
the monitor. I got the following off the net which is a little more
explicit.
----------------------------------------------------------------------
>From hv@uwasa.fi Fri May 26 08:59:26 1989
Return-Path: <hv@uwasa.fi>
From: Harri Valkama LAKE<hv@uwasa.fi>
Subject: Atari Multisync
To: dinolt@wdl1
Date: Fri, 26 May 89 8:26:15 EET DST
X-Mailer: Elm [version 2.1 PL1]
George,
I think this can be for a great help when trying to connect Atari ST
to any Multisync monitor (especially NEC's). I got this from Lea
Viljanen (University of Helsinki) who had seen it somewhere some
months ago.
----------------------------------------------------------------------------
>From ladybug@clinet.fi Fri May 26 00:00:40 1989
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Date: Thu, 25 May 89 16:07:33 EDT
From: Lea Viljanen <ladybug@clinet.fi>
Subject: Multisync...
To: hv@chyde.uwasa.fi
Message-Id: <8905252007.AA24338@clinet.FI>
From: Lea Viljanen <ladybug@clinet.fi>
Subject: Multisync...
---
Date: 26 Aug 88 02:01:37 GMT
From: ldp.dec.com!weaver@decwrl.dec.com (Dave, DTN 297-7141, MRO2-4/E33)
Subject: NEC MultiSync II switchbox (color/mono)
To: info-atari16@score.stanford.edu
NEC MultiSync II to Atari ST
--- --------- -- -- ----- --
Copyright (c) 1988 David S. Weaver
All rights reserved
This file may be copied freely only with the inclusion of the above
copyright notice for non-commercial use.
The NEC MultiSync II is an easy monitor to connect to your ST if
you want a monitor that can be used with systems other than just the
Atari ST. The following text describes how to build a switch box
to connect the MultiSync II to the ST to allow use of color or monochrome
with the flick of a switch.
Some specs for the MultiSync II and Atari:
NEC MultiSync II Atari
low medium high
------- ------- -------
Horizontal Frequency: 15.5kHz - 35kHz 15.8kHz 31.5kHz 35.7kHz
Vertical Frequency: 50Hz - 80Hz 60Hz 60Hz 71.2kHz
Horizontal Resolution: 800 dots 320 640 640
Vertical Resolution: 560 lines 200 200 400
Signal level: TTL pos --- --- ---
(analog) 0.7Vpp 75 ohm pos 1.0Vpp 75 ohm
Sync Signal level: TTL pos/neg TTL 3.3K neg
(analog) 0.3Vpp neg --- --- ---
As one can see from the chart, all the Atari specs fall with the NEC's
except for the 35.7kHz (instead of 35kHz) which doesn't seem to be a
problem. Also the video signals are a bit high (1.0Vpp rather than
0.7Vpp), but it seems to be working just fine without the addition of
any resisters. (If you want to add a resister, you would need 107-75
ohms or 32 ohms in series for the RGB signals, if I did my math correctly)
I initially had a problem with the NEC not syncing to high rez mode on
the ST after powering off the monitor and then powering it back on
again. The workaround was to either unplug the video cable, or reboot
the ST. I decided to add a switch to break the horizontal and
vertical sync lines. During the process, I switched the cables I was
using to feed the DB9 connector to some that were more flexible because I
had a problem with the signal lines breaking at the connector. I also
grounded the DB9 connector to the shield ground in the cable from the
Mega ST. As a result of this rework, I found I no longer needed the
extra switch to interrupt the sync signals.
The following pin assignments are what work when connecting an NEC
MultiSync II to a Mega ST2 for color operation, they should work for
any of the ST series:
MultiSync II Mega ST
(female DB-9) (male 13 pin DIN)
pin 1 red pin 7 red
pin 2 green pin 6 green
pin 3 blue pin 10 blue
pin 5 mode control or v sync pin 12 verticle sync
pin 4 h/v sync or h sync pin 2 composite sync
pin 6 red ground pin 13 ground
pin 7 green ground pin 13 ground
pin 8 blue ground pin 13 ground
pin 9 ground pin 13 ground
The Mega ST can also use this combination for sync:
pin 4 h/v sync or h sync pin 9 horizontal sync
pin 5 mode control or v sync * not connected
For monochrome to work, use the following connections instead of
those listed for the same pins above:
pin 1 red pin 11 monochrome
pin 2 green pin 11 monochrome
pin 3 blue pin 11 monochrome
* Connect to pin 13 (ground) if you want to increase the
vertical size on the screen. Not really needed as the
front panel "v size" switch has enough control, and the
image size is big enough with the "v size" switch in the
dentented position.
In addition, you will want to provide a separate RCA jack to provide
an audio out connection, given that the Multisync has no audio
capabilities:
RCA jack ST connection
-------- -------------
audio pin 1 audio out
ground pin 13 ground
I ended up buying a "multisync" cable from Practical Solutions.
The Practical Solutions cable has the following color coding:
Pin Color Function
---- -------------- -----------------------
1 yellow coax audio out
2 black coax composite out (composite sync on Mega)
3 n/c
4 red monochome monitor (ground for monochrome)
5 n/c
6 green coax rgb - gr