3dfx Archive - Rampage dongle

Geri Full Member Offline Posts: 216 Gender:	Re: Rampage dongle Reply #450 - 25.10.13 at 02:52:09 i have sent privmsg. i think i have picked you up on skype.
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gdonovan

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Re: Rampage dongle
Reply #451 - 25.10.13 at 11:58:25

Geri wrote on 24.10.13 at 17:14:07:

i didnt left, just i not specifically develop anything for 3dfx
since there is d3d supported, some day i can vomit a titaniumgl version that have opengl 1.4 support. for that, i need a vnc connection, and somebody, who pressing reset button on demand.

I could be available for that too, would just need to run a cable to my workshop.

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Rampage is alive!

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m14radu God Member Offline Take your chance ! Posts: 555 Timisoara, Romania Gender:	Re: Rampage dongle Reply #452 - 25.10.13 at 12:54:17 Well Osckhar i would be happy to help but......no rampage
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Loeschzwerg Senior Member Offline AAlchemy PSU maker :-) Posts: 396 Germany -> Bavaria -> Augsburg Gender:	Re: Rampage dongle Reply #453 - 01.12.13 at 16:36:43 Fixed GND on VGA input and different resistor set. Going for a third revision of the design. It will be smaller and all signal traces will have the same length. This way I hope to get the color lines synced.
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trevormacro

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Re: Rampage dongle
Reply #454 - 01.12.13 at 17:34:24

Loeschzwerg wrote on 01.12.13 at 16:36:43:

Fixed GND on VGA input and different resistor set.

Going for a third revision of the design. It will be smaller and all signal traces will have the same length. This way I hope to get the color lines synced.

Thanks for your precious work.
I will test it and let you know about the results with the Rampage B001.
You would like pictures with my sony cybershot or with fraps? to see color lines synced.

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« Last Edit: 01.12.13 at 17:34:53 by trevormacro »

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Loeschzwerg Senior Member Offline AAlchemy PSU maker :-) Posts: 396 Germany -> Bavaria -> Augsburg Gender:	Re: Rampage dongle Reply #455 - 01.12.13 at 17:41:23 Cybershot please. Fraps grabs the image directly from the framebuffer of the GPU, so it grabs the digitally stored image before the DAC output.
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trevormacro God Member Offline Voodoo5k6 Gold SE, Legend & Mystical Edition Posts: 622 Gender:	Re: Rampage dongle Reply #456 - 01.12.13 at 17:50:27 Loeschzwerg wrote on 01.12.13 at 17:41:23: Cybershot please. Fraps grabs the image directly from the framebuffer of the GPU, so it grabs the digitally stored image before the DAC output. Ok thanks for the information. I will take them with my Sony device.
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trevormacro

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Re: Rampage dongle
Reply #457 - 02.12.13 at 18:51:18

@Loeschzwerg:

I have some informations to make a good dongle (this information comes from an engineer):

You don’t need to know much to do this. Just a good amount of curiosity.

To do this scientifically, I would do the following:

-       Find out what the values of RGB should be

o Get a test pattern and display it for a good card (any decent video card)

o Measure the output using a scope

-       Find out what the Rampage is doing

o Repeat above, see the difference

-       Calculate the added boost needed with the correct resistor values

To do this in an un-scientific matter:

-       Make the circuit below (I couldn’t find any schematics, but the bread board method is the best for experimentation)

-       Use POTs instead of resistors (http://en.wikipedia.org/wiki/Potentiometer)

o Before putting the POT, adjust them to be in the same range as the resistors in the bread board picture

§ This is how you find the value of the resistors:

http://en.wikipedia.org/wiki/Electronic_color_code

-       Use the bread board with your Rampage and see how the colors look

-       Use the picture of the good pattern to see which color needs to be adjusted.

-       Adjust the pot for the color you want until it matches a good test pattern

Remember that adjust things slowly and think good what you are trying to do before turning anything. It would be easy to fry the VGA port.

What do you think?

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Loeschzwerg

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Re: Rampage dongle
Reply #458 - 03.12.13 at 07:30:43

More or less I did exactly this Wink

My last attempt was using variable resistors / potentoimeters (Dongle no. 4 before I send it to you).

The main problem is that color line red, green and blue aren't sync. Thats why the image is unsharp and the letters shifted.

The traces on my Dongle PCB aren't the same lenght... my fault and will be corrected with next revision. But I think that this is causing the delay in the analog signaling.

No matter how, it is still hard to do tests without having a working rampage card.

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« Last Edit: 03.12.13 at 07:31:30 by Loeschzwerg »

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Jean-Pierre Subtil YaBB Newbies Offline Le 3dfx addict Posts: 16 France Gender:	Re: Rampage dongle Reply #459 - 03.12.13 at 08:23:33 I would be interresting to add for example 250Ohms trim pots for each signal to get the best looking color, in a test board, then use 0.1% resistor with the right value.
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Loeschzwerg Senior Member Offline AAlchemy PSU maker :-) Posts: 396 Germany -> Bavaria -> Augsburg Gender:	Re: Rampage dongle Reply #460 - 03.12.13 at 08:50:33 I had every main resistor of every line replaced with potentiometers. Only brightness/color intensity changed, but lines still weren't "sync". So I still think that this is a problem of my PCB design.
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Jean-Pierre Subtil YaBB Newbies Offline Le 3dfx addict Posts: 16 France Gender:	Re: Rampage dongle Reply #461 - 03.12.13 at 11:30:20 Ok, have you tried to replace all free space by ground connection, or ground layer ? (sorry for my english, i'm not good at it ).
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Re: Rampage dongle
Reply #462 - 03.12.13 at 13:45:36

Jean-Pierre Subtil wrote on 03.12.13 at 11:30:20:

Ok, have you tried to replace all free space by ground connection, or ground layer ? (sorry for my english, i'm not good at it Cheesy

).

That would eventually "clear" signal from noise and I think Dominik did it already at some point in the releasing of the dongle revisions. If color signals aren't perfectly synced as he stated I think we have a different problem here instead.

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OLD SCHOOL: Because it was done right the first time

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Loeschzwerg

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Re: Rampage dongle
Reply #463 - 03.12.13 at 14:09:18

goriath wrote on 03.12.13 at 13:45:36:

Jean-Pierre Subtil wrote on 03.12.13 at 11:30:20:

Ok, have you tried to replace all free space by ground connection, or ground layer ? (sorry for my english, i'm not good at it Cheesy

).

That would eventually "clear" signal from noise and I think Dominik did it already at some point in the releasing of the dongle revisions. If color signals aren't perfectly synced as he stated I think we have a different problem here instead.

Correct

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trevormacro

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Re: Rampage dongle
Reply #464 - 03.12.13 at 21:47:00

Loeschzwerg wrote on 03.12.13 at 07:30:43:

More or less I did exactly this Wink

My last attempt was using variable resistors / potentoimeters (Dongle no. 4 before I send it to you).

The main problem is that color line red, green and blue aren't sync. Thats why the image is unsharp and the letters shifted.

The traces on my Dongle PCB aren't the same lenght... my fault and will be corrected with next revision. But I think that this is causing the delay in the analog signaling.

No matter how, it is still hard to do tests without having a working rampage card.

Here is his answer:

Interesting. My answer:

- The trace lengths difference has to be a lot for this to happen but I guess it is possible.
- I would be good to see the picture of the dongle you have to see the trace lengths.
- Also you can try to short out (bypass the board trace) to see the changes on the screen.
- Do you see the same problem in lower resolutions?

So what is your answer?

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