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From: lesterh@fishnet.net (Lester Haller)
Newsgroups: comp.sys.ibm.pc.hardware.video
Subject: Re: Question on Matrox Millenium Capability
Date: Mon, 05 Feb 1996 17:10:23 GMT
Organization: Leonardo Internet
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Message-ID: <4f5f87$bpn@donatello.leonardo.net>
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dolson@bnr.ca (John Dolson) wrote:


>I'm thinking about buying a Millenium card, but need to better
>understand it's capabilities first.

>It sounds like the software that comes with it allows me complete
>and total control of all of the frequencies and timing. In my
>application I want to be able to test older (and assorted) single
>frequency monitors, so I'll need to be able to adjust things like
>horizontal freq., vertical refresh, front porch, back porch etc.
>Can I do this with the Matrox card ?

>It's been described that I can change all of the above settings (in very
>fine increments), swap monitors and choose test to apply the new settings.
>Using
>the necessary caution to not blow up my good monitor, is it
>possible to somehow "restore" the original settings if the monitor
>being tested doesn't work ?

>Is it true that the Millenium only supports separate sync signals ?
>(i.e. uses a 5BNC interconnect scheme ) It sounds kind of odd
>that it can't support and composite sync scenarios like "sync on green"
>or 4BNC.

>Thanks in advance for any help. Posting here or direct email would
>be great.

>John Dolson
>dolson@magi.com

The Matrox Millenium comes with both a dos and a windows monitor
select utility. Both use the same file called 'mga.mon' which
contains settings for a few dozen or so monitors. The file is ascii
and contains comments on how to add a new entry for your own monitor.
I have done this for my Nanao F550i-W and it seems to work fine.
However, you do need the following information:

Horizontal Front Porch
Horizontal Sync Period
Horizontal Back Porch
Vertical Front Porch
Vertical Sync Period
Vertical Back Porch
Pixel Clock Frequency in Khz (i.e. 80,000 = 80Mhz)

The first 3 (horizontal) items are expressed in pixel clock counts,
and the following 3 (vertical) items are expressed in scan line
counts. Fortunately, my Nanao manual gave specifications for the
first 6 items, but the Pixel Clock Frequency was left for me to
calculate. However, if you have a good guess, enter that into the
file, and when you run the windows utility (sadly not the dos) it will
show the refresh rate for the highlighted mode based on the seven
parameters above (smart program!)

Nanoa (sorry if this is too long) supplied guidelines for video timing
specs that might be valid for other monitors. The horizontal Blanking
Period (front porch+sync period+back porch) should be 25% to 30% of
the display period. Furthermore, the Front Porch should be 10% to 20%
of the blanking period, and the Sync should be 20% to 50%, and the
Back Porch should be 40% to 60%. Of course these numbers should add
up to 100%. For the Vertical Blanking period should be 5% to 7% of
the active video time, with the coresponding breakdown the same as the
horizontal. Now for a quick example that may make this seem a bit
easier.

1024x768@72hz

horizontal blanking = 1024*0.3 = 307 pixel counts total
horizontal front porch = 307*0.1 = 31 pixel counts
horizontal sync period = 307*0.4 = 123 pixel counts
horizontal back porch = 307*0.5 = 153 pixel counts (rounded this down)

vertical blanking = 768*0.05 = 38 lines
vertical front porch = 38*0.1 = 4 lines
vertical synch period = 38*0.4 = 14 lines (rounded this down)
vertical back porch = 38*0.5 = 19 lines

pixel frequency = (1024+307) * (768+38) * 72 = 77,241 Khz (or 77.241
Mhz)

Type these numbers into the file mga.mon, reselect the monitor (this
entry) and then use the test button to test the various modes on the
fly. If problems occur re-edit the entry and repeat. No reboots are
necessary and this can be performed from within windows (3.1 or 95).

By the way, I do recommend this board. I am an old time ATI user and
so far I have not been disapointed with the windows or the DOS
performance.

Lester Haller
Lestrox Consulting
lesterh@fishnet.net