Monitor question for Atari 520ST

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2 total messages Started by jallen Tue, 04 Feb 1986 13:19

#2384

Author: jallen
Date: Tue, 04 Feb 1986 13:19

16 lines
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I have a Sanyo 9" composite video monitor and would like to buy an
Atari 520ST.  Can anyone tell me if this monitor will work or do I
have to buy the Atari monitor?  If it is just a problem of connectors,
I can fix that.  This monitor has been used on IBM Pcs and an Apple ][.
Please mail replies to me.  Thanks in advance.
				-Jon Allen


USMAIL:         Jon Allen
                AT&T Communications
                Room C50-52A58
                30 Knightsbridge Road
                Piscataway, New Jersey 08854

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PHONE:          201-457-4178

Re: Monitor question for Atari 520ST

#2406

Author: jhs
Date: Thu, 06 Feb 1986 23:14

22 lines
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If it is a color monitor it should work just fine.

If it is a monochrome monitor, you will probably have to
re-tweak the vertical and horizontal hold controls to lock it in, and you may
well have to make some changes to the sweep circuits both to lock it in and to
get a full-sized picture with the right aspect ratio (horizontal to vertical
scale factors).

However, I hasten to add that I have never tried this and don't even own an
ST (yet).  The main problem is that the ST expects a monochrome monitor to
run at a 70-Hz frame rate, non-interlaced, and to have 640 by 400 pixels.
Standard monochrome monitors run at 60 Hz and I'm not sure of the screen
resolution.  The 400 should be no problem, as this is an "analog" quantity.
But the number of lines is not, and there may be a problem of "folding over"
of the picture.  Also the geometry may not be right unless you change the gain
of one of the sweep channels.

If you think I sound like I know what I'm talking about, don't be fooled.
Find somebody who really knows what monochrome monitors are all about.

						-John Sangster
						jhs at mitre-bedford.arpa

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