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[yaywoop]

lol. i can't believe both of you are modding bioses without a chip
probably a good idea to get a programmer as well. i am guessing you will need it

and i made a new vga cable with a male plug on the end. so now it is actually useful. i used a normal xbox cable and wired up a vga cable to the avip plug. vga cables have enough unused wires (for digital data and stuff) to have the sound going through the same cable to a breakout box. it uses internal sync signals as well

[FrostyTheSnowman]

QUOTE(yaywoop @ Sep 8 2007, 06:30 PM)

and i made a new vga cable with a male plug on the end. so now it is actually useful. i used a normal xbox cable and wired up a vga cable to the avip plug. vga cables have enough unused wires (for digital data and stuff) to have the sound going through the same cable to a breakout box. it uses internal sync signals as well

Nice cable, it reminds me of my own, except better because you are using the internal sync signals.  

I'm too lazy to wire up internal syncs, but I do admit that they are superior.  

Have you tried the new disc with your cable? (also, you can copy the files off the disc and make it an application on your hard drive if you like.)

QUOTE(yaywoop @ Sep 8 2007, 06:30 PM)

lol. i can't believe both of you are modding bioses without a chip
probably a good idea to get a programmer as well. i am guessing you will need it

Nah, a Duo X2 should suffice, it has 2 banks.

[yaywoop]

QUOTE(FrostyTheSnowman @ Sep 9 2007, 10:51 AM)

Nice cable, it reminds me of my own, except better because you are using the internal sync signals.  

I'm too lazy to wire up internal syncs, but I do admit that they are superior.  

Have you tried the new disc with your cable? (also, you can copy the files off the disc and make it an application on your hard drive if you like.)
Nah, a Duo X2 should suffice, it has 2 banks.

yeah i stole your idea i would have bought one of yours but i couldn't wait and i am handy with a soldering iron...
internal sync signals probably are better, when they work that is. i still haven't bothered fixing the line shifting. but it is hardly noticeable at 480p which is fine for me
and yeah i will give that disk a go soon
and I used to have a duo X2. but i killed it with static or something

[FrostyTheSnowman]

LOL, don't get me wrong, I fully support the idea of building your own stuff if you can.

I love hand-making these VGA cables, mostly because they are such a pain in the ass that you can't help but be proud of your work when you are done.

[yaywoop]

LOL thats right. just don't ask to look inside
i used hot glue for insulation

i tried your vga disk. it works great. i tried it on "grand theft auto san andreas" which was green and out of sync with the old patch. it works PERFECTLY. i am not sure what other games are progressive, i couldn't find a list. do you know of one?

thanks for the great bios. even if it is only media bootable. still i would be happy using it

[Foe-hammer]

Frosty,

Is it possible to add a jumper to disable the sync chip, for when using it on a monitor that supports SOG?  It would be nice to have a cable that worked on both seperate H&V and SOG.

[FrostyTheSnowman]

It shouldn't matter...

I can use my LM1881N-based cable on both types of monitors just fine.  

[Foe-hammer]

Understood, but it would be better to have the option to not have to use the LM1881N chip at all on monitors that do not need it, those that support SOG.  Might as well not have to seperate the H&V signal when there is no need to, and thereby getting a better image.

Just an idea, of which i'd use when i bought the vga cable.

[yaywoop]

QUOTE

colours were wrong blues were green, greens were blue etc

did you fix that with the disk bios?

[FrostyTheSnowman]

QUOTE(bobbyblaze @ Sep 14 2007, 07:21 PM)

Hi Frosty!

Just a quickie  Do you think that this lead of yours will be available by xmas as I've just bought a wii for the missus and have to plan on how I'm going to connect everything come the big day?

Cheers,

Rob

From what I have been told, this cable should be ready to purchase around mid-December.  

[netfraggel]

Punmaster has right that LM1881 has not standard h-sync signal but v-sync ist standard. I looked on the datasheet of the LM1881. On Pin1 the LM1881 output is c-sync (composite sync). Some displays cannot extract h-sync from the c-sync signal. But we can extract h-sync from v-sync and c-sync with a logic circuit.

RGBCV ---> RGBHV

CVH (csync,vsync,hsync TTL-Level)
---
000
010
101
110

h-sync has to be high if c-sync high and v-sync low

Now, if we use 7400 (four NAND) we may get h-sync (I dont know if the 7400 is fast enough).

The circuit:
- From LM1881 put c-sync and v-sync to the first NAND.
- The output of the first NAND and c-sync to the second NAND.
- Put the output of the second NAND to the third NAND (to invert the signal).
- The second NAND and the third NAND as intverter then build a logical AND.

See:

http://www.tkk.fi/Misc/Electronics/faq/vga2rgb/scart.html

at the end of the site for the circuit.

The LM1881 and 7400 are easy to get in many countries by private purchase.
This may be the solution to get hsync and vsync without the internal sync signals of the XBOX.
I am not sure but I think some very old Sun and Apple monitors need the c-sync instead of h-sync.
Excuse my poor english.

[yaywoop]

have you tried that circuit netfraggel?
it would probably be a good adition to the frosty vga cable, or a mod for people who need it.
 i am sure there will be room inside the box
the only place i can get a lm1881 is over the net. and i cbf, so i will stick with internal signals

[patch6-]

Many thanks to all contributing to this issue.

Punmaster: I appreciate the explanation of the "video level corrector circuit", and am trying to build one, but the "break the three "discharge” traces and wire them instead to the three negative (inverting) inputs of the op-amps" direction doesn't show up on the schematic you posted (linking pins 1 to 16, 3 to 4 and 6 to 7, I'm assuming), though I've tried both and neither seem to work (the schematic first, then the rerouting of discharge traces). The fault could be due to my human error, but some clarification would be great.

[yaywoop]

@patch6- are you referring to http://forums.xbox-scene.com/index.php?s=&...t&p=4019291

so you have the evaluation board?

I didn't realize punmaster achieved this. using that circuit and the internal vga mod its possible to get *completely* standard vga out of the xbox

I wonder if the MAX4383 could be used instead of the LMH6739
unfortunately punmaster hasn't logged in for a month or so

hey frosty. did punmaster ever complete his ultimate tutorial? I was thinking about writing one but i quickly gave up (IMG:style_emoticons/default/tongue.gif)

This post has been edited by yaywoop: Oct 4 2007, 01:35 AM

[FrostyTheSnowman]

QUOTE(yaywoop @ Oct 3 2007, 06:33 PM)

hey frosty. did punmaster ever complete his ultimate tutorial? I was thinking about writing one but i quickly gave up

I honestly can't remember.

If you look back in this thread you will find out more about it, but I don't think he ever officially released his diagram...

Man, native VGA sure is a pain in the ass on the original XBOX...