Jump to content
Unstablewarpfield

I made an Intv rgb mod

Recommended Posts

Hey guys!

 

Over these past few weeks I have made myself an rgb mod for my pal Intellivision. My Intv has two color proms in it so I was able to (with help of a diagnostic cart and my scope) determine the input and output bit coding. I made a memory map and wrote the logic in wincupl to two atf16v8cz pld's. I used an adv7125 as video dac.

 

All this to make a pcb that will interface directly on the bottom of the STIC.

 

The prototype gives me excellent image and colors on my framemeister. Pcbs are incoming somewhere next weekend, so hopefully I'll have a working test model soon.05ff65ccad625be5a1fb70594d2599dd.jpg6e977cce8e1b1da2ea89a50ddfccebd7.jpgb5ced33a1ef022daa4386385030fd529.jpg

 

Verstuurd vanaf mijn SM-N960F met Tapatalk

 

 

  • Like 10
  • Thanks 1

Share this post


Link to post
Share on other sites
17 minutes ago, grips03 said:

Would be neat if sync worked on OSSC.

You know there are at least 2 other solutions that work with OSSC currently available. But I'm also curious if this one will as well. I really like the idea of being able to solder the small PCB directly to the bottom of the STIC for the required signals. They actually come from U10 the color chip, but as that is so small, I can see this working as well. So yeah I'm curious to know more once more information is available. Always good to have options.

Share this post


Link to post
Share on other sites

Signals go from the Stic to the colour chip, Pal intellivisions don't have a colour chip.  Most of them do have an Lm1886 chip which actually generates RGB signals.  Since this solution uses Stic output, they should be able to make it work with Ntsc Intellivisions as well.

 

What colour palette are you using?

Edited by mr_me

Share this post


Link to post
Share on other sites

Well that is good news, I have used 3 other Intv RGB mods, not a single one worked with OSSC. 

 

Confirmed not working with OSSC due to sync issue:
Juice / Fred Kono RGB
Bruce Abbott RGB

Emerson RGB

 

What are the two that do?

Share this post


Link to post
Share on other sites

Crayola the Crayon King's v5 board works with the OSSC. Works with the Retrotink 2x-Scart too. Blows the kono mod out of the water, imho.. Just did my model II a few days ago. :)

 

He's selling them on eBay.

 

https://www.ebay.com/itm/284134846315

 

I'm not sure about the other one that was mentioned.

Edited by SiLic0ne t0aD
  • Like 1

Share this post


Link to post
Share on other sites

I'm pretty sure it does from what I read in his thread.

 

I'm about to find out soon.. I'm definitely swapping out the Kono board for the Crayola in my Model I since it seems to be compatible with everything.

Share this post


Link to post
Share on other sites

Cool I'll wait to hear back on that if you don't mind posting.

 

Anyone know the name of the other one?

  • Like 1

Share this post


Link to post
Share on other sites
Signals go from the Stic to the colour chip, Pal intellivisions don't have a colour chip.  Most of them do have an Lm1886 chip which actually generates RGB signals.  Since this solution uses Stic output, they should be able to make it work with Ntsc Intellivisions as well.
 
What colour palette are you using?
To be fair the lm1886 does not output an rgb signal. It takes in 3-bit rgb from the color proms though, which is what I reconstructed in smaller form for this mod to fit the way I wanted it to. Output colors are an exact match to the original pal ones. Unfortunately I have no access to an ntsc console. Might purchase one to tinker a bit with.

Verstuurd vanaf mijn SM-N960F met Tapatalk

  • Like 2

Share this post


Link to post
Share on other sites
23 minutes ago, Unstablewarpfield said:

To be fair the lm1886 does not output an rgb signal. It takes in 3-bit rgb from the color proms though, which is what I reconstructed in smaller form for this mod to fit the way I wanted it to. Output colors are an exact match to the original pal ones. Unfortunately I have no access to an ntsc console. Might purchase one to tinker a bit with.emoji854.png

Verstuurd vanaf mijn SM-N960F met Tapatalk
 

Thanks.  I was thinking of the UK Intellivisions which have more of a reddish-brown titlescreen.  This looks more like ntsc intellivision colour.

 

Can you post the colour palette you measured and are using?

Share this post


Link to post
Share on other sites

Prototype soldered in and up an running with no problems on my Framemeister. It's on to testing this now on several different tv's and scalers/line doublers. In the end I'll open source the gerber and jedec files on a website I'm building, so all will be made public. Just want to run it through its paces before I open up the project :-) e943a99a378fc5b96e331534fbcf39f7.jpg

Verstuurd vanaf mijn SM-N960F met Tapatalk

  • Like 8

Share this post


Link to post
Share on other sites
8 hours ago, Unstablewarpfield said:

Prototype soldered in and up an running with no problems on my Framemeister. It's on to testing this now on several different tv's and scalers/line doublers. In the end I'll open source the gerber and jedec files on a website I'm building, so all will be made public. Just want to run it through its paces before I open up the project 🙂 e943a99a378fc5b96e331534fbcf39f7.jpg

Verstuurd vanaf mijn SM-N960F met Tapatalk
 

 

Can you try OSSC?  Would it support NTSC Intellivision?

 

 

Share this post


Link to post
Share on other sites

Also curious the results with the Tink devices like the Tink2x SCART (Like I have on hand to test) and the Tink5x of which there are several members here who can test that.

 

Share this post


Link to post
Share on other sites

Nice work! I’m very interested. I have a PAL INTV system III that I would like to use with my OSSC, so I’m really hoping this mod is compatible.

Share this post


Link to post
Share on other sites

Looks good. I wish I could fit something in a tiny space like that. AFAIK this wouldn't be able to get video on the OSSC without some additional coding for sync. (which maybe you did already?)  

I have my own fix but I do not believe it could fit on a PLD. Yannick worked something out that should be able to work with this on the OSSC. You would have to ask him what it was exactly. 

 

Share this post


Link to post
Share on other sites

Yannick's board does work with the OSSC on my setup in at least passthrough, 2x and 5x modes. I think 4x and 3x produce a resolution that my TV isn't okay with and not a fault of the OSSC. Yannick's solution he told me he got from you @the_crayon_king? Basically just isolating some of the input signals with some diodes and a resistor to provide the sync directly. That is the hardware fix I did on the last batch of semi proto boards he sent me and I've been hearing good things. His board is working on the Tink5x in all modes as well minus the 1080p FULL or FILL mode as that causes drop outs. But all others seem to work fine on that device.

 

Share this post


Link to post
Share on other sites
3 minutes ago, -^CrossBow^- said:

Yannick's board does work with the OSSC on my setup in at least passthrough, 2x and 5x modes. I think 4x and 3x produce a resolution that my TV isn't okay with and not a fault of the OSSC. Yannick's solution he told me he got from you @the_crayon_king? Basically just isolating some of the input signals with some diodes and a resistor to provide the sync directly. That is the hardware fix I did on the last batch of semi proto boards he sent me and I've been hearing good things. His board is working on the Tink5x in all modes as well minus the 1080p FULL or FILL mode as that causes drop outs. But all others seem to work fine on that device.

 

Yes I know Yannick's works on the OSSC. I pointed him to a solution (that would work on his board) but he worked out his own thing himself. His fix and my fix are not at all the same.

I was pointing OP to the fact that Yannick's fix (whatever it is) should work here. 
The data capture on my Intellivision RGB thread is enough to work out the logic needed.

 

If Yannick's board works on the 5X (when mine doesn't) then I am sure I can make a fix that works across the board.

I just need to get a hold of a 5X for like a weekend and I am sure I can make it work.

 

@Unstablewarpfield If you are only using 4 bits input to the ADV then your output will be limited to 672mv p-p [this will make white possibly off-colored]. 

You can adjust RSET to fix this (but it will increase the relative brightness of the other colors). Or you can tie the unused bits to some of the used bits.

I think you might be better off using a PLD > buffer > resistors > THS7374. That is if you are trying to make a board for DIYers and not use more than 4 bits input.

That is my 2cents; feel free to ignore any of that. 

Share this post


Link to post
Share on other sites

The simple solution I've implemented was drafted based on the measurements and observation from @the_crayon_king but I've simplified it a lot based on the previous observations and tests I did.

It simply implements SYNC as being NOT((V1 OR V4) AND V5) instead of NOT(V1 AND V5). The fix with additional diodes is performing (V1 OR V4) so that we can re-use previously produced boards.

The final fix is implementing the full equation within one 4xNAND chip.

Here is a link to the EasyEDA project : https://easyeda.com/yannick.erb/Intellivision-Secam-RH-RGB-Mod_copy_copy

This is the French version of the board that is bigger in order to fit at the location planned for the power supply board that is not present in some french versions of the Intellivision.

Edited by YannAros
  • Like 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...