Logistics wrote:

Are the analog RGB signals sent from one card to the next over that cable? If so it may be advisable to use an 80-pin ultra ata cable as it is 75-Ohm just like video cable.

I think you mean a 80 conductor 40-pin cable 😉

The resistance shouldn't matter much considering it's such a short cable. Howerver, I'm curious as to how to peel a 80 conductor ribbon cable without tearing it and how to twist it correctly. If I had one to spare, I'd test that immediately 🤣

Now you say it, there should be video signals running in that cable. SLI works making each Voodoo2 card render alternatively the lines of the display, so the video information should travel through the SLI cable.

Ok, so i edited it a bit. Added the direction where which pin should go.
I think its not too crowded and it can be easily understood 😀

Also, will be glad to make any scheme in illustrator if asked.

Scylla wrote:

I think you mean a 80 conductor 40-pin cable ;) […]
Show full quote

Logistics wrote:

Are the analog RGB signals sent from one card to the next over that cable? If so it may be advisable to use an 80-pin ultra ata cable as it is 75-Ohm just like video cable.

I think you mean a 80 conductor 40-pin cable 😉

The resistance shouldn't matter much considering it's such a short cable. Howerver, I'm curious as to how to peel a 80 conductor ribbon cable without tearing it and how to twist it correctly. If I had one to spare, I'd test that immediately 🤣

Now you say it, there should be video signals running in that cable. SLI works making each Voodoo2 card render alternatively the lines of the display, so the video information should travel through the SLI cable.

An impedance mismatch caused by even a tiny imperfection in cable makeup can cause a reflection resulting in more than a 3db reduction in signal which makes worlds of difference in picture when it comes to video. Perhaps, if we knew the appropriate pins we could just use the 80-conductor cable for the video signals.

Scylla wrote:

I think you mean a 80 conductor 40-pin cable ;) […]
Show full quote

Logistics wrote:

Are the analog RGB signals sent from one card to the next over that cable? If so it may be advisable to use an 80-pin ultra ata cable as it is 75-Ohm just like video cable.

I think you mean a 80 conductor 40-pin cable 😉

The resistance shouldn't matter much considering it's such a short cable. Howerver, I'm curious as to how to peel a 80 conductor ribbon cable without tearing it and how to twist it correctly. If I had one to spare, I'd test that immediately 🤣

Now you say it, there should be video signals running in that cable. SLI works making each Voodoo2 card render alternatively the lines of the display, so the video information should travel through the SLI cable.

An impedance mismatch caused by even a tiny imperfection in cable makeup can cause a reflection resulting in more than a 3db reduction in signal which makes worlds of difference in picture when it comes to video. Perhaps, if we knew the appropriate pins we could just use the 80-conductor cable for the video signals.

Guys, you're absolutely brilliant!

The new article is excellent, and it's linked to the V2 section, which is a great idea!

Stojke, I have no idea who made the original image, it seems like the original scanned blueprints given to a S. East Asia OEM factory. Anyway, your scheme is fantastic and very professional looking.

Here's my suggestion:

http://i.imgur.com/7RkG7aZ.png

I removed the message below the cable, because it might induce people to think only pins 16 and 19 are to be twisted. I added a message above the pin assignment. I looks pretty amateur, I did it with Windows Paint! 😁

Logistics wrote:

Scylla wrote:

I think you mean a 80 conductor 40-pin cable ;) […]
Show full quote

Logistics wrote:

Are the analog RGB signals sent from one card to the next over that cable? If so it may be advisable to use an 80-pin ultra ata cable as it is 75-Ohm just like video cable.

I think you mean a 80 conductor 40-pin cable 😉

The resistance shouldn't matter much considering it's such a short cable. Howerver, I'm curious as to how to peel a 80 conductor ribbon cable without tearing it and how to twist it correctly. If I had one to spare, I'd test that immediately 🤣

Now you say it, there should be video signals running in that cable. SLI works making each Voodoo2 card render alternatively the lines of the display, so the video information should travel through the SLI cable.

An impedance mismatch caused by even a tiny imperfection in cable makeup can cause a reflection resulting in more than a 3db reduction in signal which makes worlds of difference in picture when it comes to video. Perhaps, if we knew the appropriate pins we could just use the 80-conductor cable for the video signals.

First of all, 80-conductor cable has a wider connector.
Second of all, 40 of 80 conductors are GND.

I hardly see any point in it. If the cable was flawed, we would see a picture of flawed lines interlaced by flawless ones. Since we don't, there's no reason to worry.

P.S. A ferrite filter might be a good idea, by the way.

Stojke, Pin 1 is red line, that's why it's red 😀

Oh, derp. Thought it was like that, will modify when i return from college today 😀
Also will expand it a bit. Thanks rug, will have that in mind 😁

I tested the whole thing today. Made detailed guide with pics! 😀
http://www.vogonswiki.com/index.php/How_to_ma … doo_2_SLI_cable

RacoonRider wrote:

First of all, 80-conductor cable has a wider connector. Second of all, 40 of 80 conductors are GND. […]
Show full quote

Logistics wrote:

Scylla wrote:

I think you mean a 80 conductor 40-pin cable 😉

The resistance shouldn't matter much considering it's such a short cable. Howerver, I'm curious as to how to peel a 80 conductor ribbon cable without tearing it and how to twist it correctly. If I had one to spare, I'd test that immediately 🤣

Now you say it, there should be video signals running in that cable. SLI works making each Voodoo2 card render alternatively the lines of the display, so the video information should travel through the SLI cable.

An impedance mismatch caused by even a tiny imperfection in cable makeup can cause a reflection resulting in more than a 3db reduction in signal which makes worlds of difference in picture when it comes to video. Perhaps, if we knew the appropriate pins we could just use the 80-conductor cable for the video signals.

First of all, 80-conductor cable has a wider connector.
Second of all, 40 of 80 conductors are GND.

I hardly see any point in it. If the cable was flawed, we would see a picture of flawed lines interlaced by flawless ones. Since we don't, there's no reason to worry.

P.S. A ferrite filter might be a good idea, by the way.

Maybe you're thinking of a different cable because my 40-conductors have always fit where my 80-conductors go and vice versa. The 40 of the 80 conductors being ground, and being used in a G-S-G configuration is what allows them to have 75-Ohm impedance. And I agree with your theory about half the lines being incorrect, but up to this point we haven't actually established that the analog signals travel over this cable; it's just been speculation.

There is probably no reason to worry.

OK, now it has to be good! 😀

You guys absolutely rule!

The article is brilliant now, and so is the schematics.

Now, I only have to find two V2 cards! 🤣 🤣 ;P

That's what wiki needs - unique content 😀

[quote=RacoonRider]First of all, 80-conductor cable has a wider connector.
Second of all, 40 of 80 conductors are GND.

I hardly see any point in it. If the cable was flawed, we would see a picture of flawed lines interlaced by flawless ones. Since we don't, there's no reason to worry.

P.S. A ferrite filter might be a good idea, by the way.[/quote]

You are, of course, right. 80-conductor cables were 40-pin for HDD and not 34-pin for FDD and then, half the cables are to connect to GND as it's documented everywhere.
http://www.pcguide.com/ref/hdd/if/ide/confCable80-c.html

The final revision of the Voodo2 SLI is awesome, congratulations for such quality work.