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From: mbaker@ucs.adelaide.edu.au (Matthew Baker)
Newsgroups: comp.sys.atari.st
Subject: Re: Neo Desk 3
Message-ID: <3637@sirius.ucs.adelaide.edu.au>
Date: 13 Jun 91 09:57:48 GMT
References: <750118@hpsad.HP.COM>
Organization: Information Technology Division, The University of Adelaide, AUSTRALIA
Lines: 23

From article <750118@hpsad.HP.COM>, by randyh@hpsad.HP.COM (Randy Hosler):
> If you tie the mono-detect line to ground the ST thinks it has a mono
> monitor hooked up to it.  The scan rate goes to 70Hz and all you see on
> the color monitor (actually I'm not sure about the color monitor, but on
> my TV) all I see is scrolling orange lines.  In other words, it don't
> work that way.  But, you may be able to hear the audio. :-)
> 
> Randy Hosler

The reason the ST polls the /MONO line 50/60/71 times a second is to avoid
blowing the sh!t out of your color monitor.

The horizontal osc cctry will try to lock to twice the normal horizontal
scan freq... this oscillator is also used to generate the EHT in your
system. If you're lucky, all that will happen is that the osc will freerun
and make a bit of a squeal. However, if you aren't lucky... anything from the
horiz. o/p transistor, the EHT coil, tripler, or even the tube (unlikely) 
may fail. These failures, involving _very_ (20+KV) high voltages can be
messy, noisy, smelly, and _very_ expensive.

Don't do it. 

Matthew