Mach64 'Dot Clocks', Daewoo Monitor 'Modelines'?

Mach64 'Dot Clocks', Daewoo Monitor 'Modelines'?

Post by Russell McOrmo » Tue, 03 Jan 1995 06:16:31



  I have two questions.  I have not set up many X windows systems, so am a
beginner here.  I have a Mach64 graphics card (Yes, I know the accelerated
server is not available), and a Daewoo SVGA monitor.

  With the Mach64 I let X scan the card and come up with some dot clock
settings, but I'm not sure if they are correct or valid - does anyone with
more X experience and one of these cards have a more valid set of clocks?

Section "Device"
    Identifier "Mach64"
    VendorName "ATI"
    Chipset "vgawonder"
    BoardName "Unknown"
    Clocks 18 22 25 28 36 44 50 56 30 32 37 39 40 0 75 65
#    Clocks 0.00 110.46 126.02 135.07  50.23  56.63  63.00  72.03
#    Clocks 0.00  79.95  75.00  65.00  39.96  44.79  49.46  49.92
#    Clocks 0.00  55.05  63.00  67.52  25.11  28.30  31.49  36.06
#    Clocks 0.00  39.97  37.47  32.50  20.01  22.39  24.73  24.96
EndSection

  The comment out clocks are the ones that I got from a scan, the others
are from a message posted on the net a while ago.

  With the monitor I am able to do 800x600 with no problem, but while the
manual says that I can do 1024x768 non-interlaced, I get a very flickering
screen when going into that mode.  Does anyone have some more valid
'Modeline' lines for these resolutions, or would be able to explain to me
in simple terms exactly how to figure one out myself?

Section "Monitor"
    Identifier "Daewoo-1501"
    VendorName "Daewoo"
    ModelName "CMC-1501BA/MPR"
    BandWidth 75 MHz
    HorizSync 31-60 KHz
# Blanking time Min 3.4 micro-sec, Resolution Max 1024 (non-interlaced)
    VertRefresh 50-90 Hz
# Blanking time Min 0.45 msec, Resolution Max 786 Lines
    ModeLine "800x600" 36 800 808 944 984 600 608 612 633
    Modeline "1024x768"    65    1024 1032 1176 1344   768  771  777  806
EndSection

  Thanks!

---
 Russell McOrmond, Ottawa Ontario, Canada.  Work: World Wide Web developer
 Array Development (613) 733-4464  Fax: 733-5691
 Standard Disclaimer applies:  I didn't do it, it was an accident!
 <a href="http://www.carleton.ca/~rmcormon/">Russell's Home Page</a>

 
 
 

Mach64 'Dot Clocks', Daewoo Monitor 'Modelines'?

Post by Marc Aurele La Fran » Tue, 03 Jan 1995 06:59:42




Quote:>   I have two questions.  I have not set up many X windows systems, so am a
> beginner here.  I have a Mach64 graphics card (Yes, I know the accelerated
> server is not available), and a Daewoo SVGA monitor.
>   With the Mach64 I let X scan the card and come up with some dot clock
> settings, but I'm not sure if they are correct or valid - does anyone with
> more X experience and one of these cards have a more valid set of clocks?
> Section "Device"
>     Identifier "Mach64"
>     VendorName "ATI"
>     Chipset "vgawonder"
>     BoardName "Unknown"
>     Clocks 18 22 25 28 36 44 50 56 30 32 37 39 40 0 75 65
> #    Clocks 0.00 110.46 126.02 135.07  50.23  56.63  63.00  72.03
> #    Clocks 0.00  79.95  75.00  65.00  39.96  44.79  49.46  49.92
> #    Clocks 0.00  55.05  63.00  67.52  25.11  28.30  31.49  36.06
> #    Clocks 0.00  39.97  37.47  32.50  20.01  22.39  24.73  24.96
> EndSection
>   The comment out clocks are the ones that I got from a scan, the others
> are from a message posted on the net a while ago.

That message was quite mistaken.  The clocks you have uncommented above
are for XFree86 <=2.1 and should not be used with >=2.1.1.  Take the
clocks you've commented out above and compare them to those in
README.ati.  Pick the closest set from README.ati.

But, more importantly, ***READ*** README.ati.

Also, ensure you are running XFree86 3.1, as Mach64 support in earlier
versions is sketchy at best, if it works at all.

Quote:>   With the monitor I am able to do 800x600 with no problem, but while the
> manual says that I can do 1024x768 non-interlaced, I get a very flickering
> screen when going into that mode.  Does anyone have some more valid
> 'Modeline' lines for these resolutions, or would be able to explain to me
> in simple terms exactly how to figure one out myself?

This is most probably caused by the invalid clocks line above.

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1. Mach64 server can't use 100MHz dot clock

I have an ATI WinTurbo 2Mb PCI graphics card. Under Windows, I run in

will support with a decent refresh rate. The dos diagnostic utility
says that the pixel clock being used is 100MHz. The Mach64 server
doesn't detect 100MHz. I tried supplying this dot clock, but that
didn't work either. The 80MHz clock works fine for 1024x768, and the
110MHz clock works for 1280x1024 (but I only get 61Hz). Is this a
problem with the server, or do I need to configure something
differently? BTW: I am running with 32Mb RAM, a Pentium 90 on an
Intel PCI motherboard. Thanks!

--
Brian Humpherys

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