1280x1024 Reduced Blanking - Vfs from 107Mhz to 99 Mhz to use with VPro V6 - Printable Version

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+--- Thread: 1280x1024 Reduced Blanking - Vfs from 107Mhz to 99 Mhz to use with VPro V6 (/thread-3574.html)

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1280x1024 Reduced Blanking - Vfs from 107Mhz to 99 Mhz to use with VPro V6 - secundis200 - 07-02-2022

Hello All
Just finished my vfc for my Samsung 19inch monitor with resolution 1280x1024@58Hz reduced blanking.

The reason is because I have a VPro V6 and I was having the pixel clock issue in 16p color.

I took one of the templates and modified it in order to move from 107Mhz pixel clock to 99.07Mhz a little far away from the pixel clock bug. And Voilla success.

I know there is a a file from someone I think is Karena, long time ago, whoever it reduces the vertical freq to 50Hz where my Samsung only work between 58-75 Hz.

So I reduced the a little here and there. and managed to get 99Mhz. which allowed me to select color depth

Here below the Vfs in case someone wants it:


/*
** 1280x1024_58.vfs - SGI standard format
*/

General
{
    FieldsPerFrame = 1;
    FramesPerSecond = 58;
    TotalLinesPerFrame = 1046;
    TotalPixelsPerLine = 1633;
    ActiveLinesPerFrame = 1024;
    ActivePixelsPerLine = 1280;
    FormatName = "1280x1024_58";
}

Active Line {
    HorizontalFrontPorch = 1 pixels;
    HorizontalSync = 122 pixels;
    HorizontalBackPorch = 230 pixels;
}

Field
{
    Vertical Sync =
    {
        {
            Length = 1.0H;
            Low = 0.0 usec;
        }
        repeat 3
{
            Length = 1.0H;
        }
    }

    Initial Low;
    Vertical Back Porch =
    {
        {
            Length = 1.0H;
            High = HorizontalSync;
        }
        repeat 16
{
            Length = 1.0H;
            Low = 0.0 usec;
            High = HorizontalSync;
        }
    }

    Initial High;

    Active =
    {
repeat 1024
{
    Length = 1.0H;
    Low = 0.0 usec;
    High = HorizontalSync;
}
    }

    Vertical Front Porch =
    {
        repeat 1
{
            Length = 1.0H;
            Low = 0.0 usec;
            High = HorizontalSync;
        }
    }
}

#if 0
    postprocess
    {
dump edge;
    }
#endif


Compile with vfc -c chip=/usr/gfx.../VPro_chip.def,board=/usr...../VPro_Board.def -o 1280x1024_58.vfo /usr/gfx......./1280x1024_58.vfs

Hope it helps

Thanks Regards

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RE: 1280x1024 Reduced Blanking - Vfs from 107Mhz to 99 Mhz to use with VPro V6 - Raion - 07-11-2022

Thanks for your contribution. At some point I have been considering a small service where we can compile these all into a searchable database. I think with the flexibility of SGI computers this is something worth pursuing to fit various niche setups.

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RE: 1280x1024 Reduced Blanking - Vfs from 107Mhz to 99 Mhz to use with VPro V6 - vishnu - 07-12-2022

(07-11-2022, 01:52 PM)Raion Wrote:  Thanks for your contribution. At some point I have been considering a small service where we can compile these all into a searchable database. I think with the flexibility of SGI computers this is something worth pursuing to fit various niche setups.

After the CRT monitor I was using on my Octane died, I couldn't figure out how to generate a file to get my Dell flat screen to work, thankfully some nekochan members stepped in and figured it out for me, Jan Jaap and Jose Hill IIRC. Writing vfc files is a royal PITA.

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